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00127fd6ebf660ac3b1da6564fed60e93c52d425 | {
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} | null | https://www.semanticscholar.org/paper/00127fd6ebf660ac3b1da6564fed60e93c52d425 | Synthesis, Characterization, and pH-Dependent Relaxivity of the Mn(II) Complex of a Novel Cyclen-Based Ligand | Previously, the Mn(II) complexes of macrocyclic ligands H4DOTA and DOTAM have been studied to better understand their solution dynamics and investigate their potential use as MRI contrast agents. It has been shown that MnDOTA has a strong pH dependence to its relaxivity and a low stability under acidic conditions. MnDOTAM has been shown to be more stable, but its relaxivity is low and shows no pH dependence. As pH variation in the body is a potential target application of MRI contrast agents, some pH dependence of relaxivity is desirable. This work focuses on the synthesis of a novel macrocylic cyclen-based ligand, 1,4,7,10-tetraazacyclododecane-1,7-bis(acetate)-4,10-bis(acetamide), containing both acetate and amide functional groups. The ligand and its Mn(II) complex are characterized in solution and the solid state. The Mn(II) complex is believed to be at least six-coordinate over a large pH range, and is stable at relatively low pH. Its relaxivity is pH dependent, and at low pH can be attributed to both inner-sphere water exchange as well as prototropic exchange. This new ligand and Mn(II) complex provide insight into the roles different functional groups play in the structure of these types of complexes which can aid in the future design of pH-sensitive, stable MRI contrast agents. | 2,014 | 0 | {
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"authorId": "66482474",
"name": "Sarah Hensiek"
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] | https://digitalcollections.wesleyan.edu/islandora/object/ir%3A2364/datastream/PDF/view | digitalcollections.wesleyan.edu | 100 |
|
00145081643c7eb67782de81e125a75bbab7583e | {
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} | null | https://www.semanticscholar.org/paper/00145081643c7eb67782de81e125a75bbab7583e | Synthesis of photoluminescent carbon dots for the detection of cobalt ions | We have developed a simple assay for the sensing of cobalt ions (Co2+), based on the analyte induced photoluminescence (PL) quenching of carbon dots (C-dots). The C-dots (mean diameter 3.6 ± 0.3 nm) prepared from L-cysteine through a simple hydrothermal process at 300 °C for 2 h have a quantum yield of 13.2%. The C-dots have strong blue PL with a maximum PL intensity at 395 nm under an excitation wavelength of 325 nm. Through the reactions of Co2+ ions with cysteine molecules/residues on the surfaces of the C-dots, non-photoluminescent CoxSy nanoparticles are formed. As-formed CoxSy nanoparticles and the C-dots further form aggregates in the solution, leading to PL quenching. The C-dot probe allows detection of Co2+ ions over a concentration range from 10 nM to 100 μM (R2 = 0.992). This reliable, rapid, sensitive, and selective C-dot probe has been utilized for the determination of the concentrations of Co2+ ions in vitamin B12 and natural water samples. | 2,015 | 62 | null | [
{
"authorId": "5316082",
"name": "Chi-Lin Li"
},
{
"authorId": "3175802",
"name": "Chih-Ching Huang"
},
{
"authorId": "3656245",
"name": "A. Periasamy"
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{
"authorId": "37264074",
"name": "Prathik Roy"
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"name": "Wei-Cheng Wu"
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{
"authorId": "3444085",
"name": "Chia-Lun Hsu"
},
{
"authorId": "2202472834",
"name": "Huan‐Tsung Chang"
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] | null | null | 101 |
|
0015cd672fe28a652b569928792b2aea581178ff | {
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} | null | https://www.semanticscholar.org/paper/0015cd672fe28a652b569928792b2aea581178ff | Crystal structure of bis(1-benzoylacetone)-p-naphthalenediimine, C30H26N2O2 | C30H26N2O2, monoclinic, P121/c1 (no. 14), a = 7.462(2) Å, b = 16.556(6) Å, c = 9.607(3) Å, ' = 104.205(4)°, V = 1150.6 Å, Z = 2, Rgt(F) = 0.043, wRref(F) = 0.103, T = 298 K. Source of material Two drops of acetic acid was added to a solution of 1,5naphthalenediamine (1.58 g, 10 mmol) and 1-benzoylacetone (3.24 g, 20 mmol) in ethanol (20 ml). The resulting mixture was refluxed for a period of 5 h. After cooling to room temperature, the reaction mixture was filtered and subsequently washed with ethanol to afford the title compound (3.51 g, yield 78.5 %). Crystals suitable for single crystal X-ray diffraction were obtained by slow evaporation of a solution in dichloromethane at room temperature. Experimental details H atoms attached to N atoms were initially located in a difference Fourier map and refined freely. Other H atoms were placed in idealized positions and treated as riding, with d(C—H) = 0.96 Å, Uiso(H) = 1.5 Ueq(C) for methyl group and d(C—H) = 0.93 Å (CH), Uiso(H) = 1.2 Ueq(C) for aromatic group. Discussion Schiff bases are of interest mainly due to their important role in the supramolecular chemistry as they usually act as multidentate ligands in the synthesis of coordination compounds with potential applications, such as catalysis, selective absorption, magnetics, and optics [1-5]. The title Schiff base derived from '-diketones can easily coordinate with metal ions in (N, O) fashion. All bond lengths and angles in the title crystal structure are in normal ranges. The torsion angles are N1–C2–C3–C4 = 2.0(2)°, C12–C13–N1–C2 = 115.1(2)° and C3–C4–C5–C6 = –28.5(2)°. The aromatic ring (C5/C6/C7/C8/C9/C10) and the naphthalene one form a dihedral angle of 86.1°. The intramolecular hydrogen bond consists of atom O1 and bond N1–H, with d(H···O1) = 1.864(1) Å, d(N1–H···O1) = 2.633(2) Å, and ∠N1–H···O1 is 138.4°. Z. Kristallogr. NCS 226 (2011) 101-102 / DOI 10.1524/ncrs.2011.0047 101 © by Oldenbourg Wissenschaftsverlag, München Crystal: yellow block, size 0.20 × 0.25 × 0.30 mm Wavelength: Mo K( radiation (0.71073 Å) +: 0.81 cm−1 Diffractometer, scan mode: Bruker SMART CCD, "/$ 2)max: 51° N(hkl)measured, N(hkl)unique: 5835, 2132 Criterion for Iobs, N(hkl)gt: Iobs > 2 &(Iobs), 1566 N(param)refined: 156 Programs: SHELXS-97, SHELXL-97 [6] Table 1. Data collection and handling. H(1A) 4e 0.4837 0.2737 0.3714 0.055 H(1B) 4e 0.4797 0.1837 0.4211 0.055 H(1C) 4e 0.6249 0.2440 0.5110 0.055 H(3) 4e 0.2412 0.1545 0.5260 0.037 H(6) 4e −0.0379 0.1007 0.4621 0.041 H(7) 4e −0.2597 0.0067 0.4774 0.050 H(8) 4e −0.3921 0.0079 0.6709 0.052 H(9) 4e −0.3095 0.1064 0.8454 0.048 H(10) 4e −0.0932 0.2028 0.8279 0.040 H(11) 4e 0.1634 0.4380 0.4316 0.038 H(14) 4e 0.7251 0.3434 0.7043 0.042 H(15) 4e 0.9336 0.4460 0.6915 0.044 H(1) 4e 0.2777 0.3474 0.6378 0.051(6) Table 2. Atomic coordinates and displacement parameters (in Å). Atom Site x y z Uiso | 2,011 | 0 | null | [
{
"authorId": "11596103",
"name": "De-Qiang Qi"
},
{
"authorId": "2108142318",
"name": "Yi‐Ping Zhang"
},
{
"authorId": "2048718330",
"name": "Xue-jie Wang"
},
{
"authorId": "92657071",
"name": "P. Lin"
},
{
"authorId": "2060411434",
"name": "Fen-Fen Ni"
},
{
"authorId": "91996203",
"name": "Tian-Hao Kong"
}
] | null | null | 102 |
|
0016f8f5f00b2804bfe60847a7cbf13224515fb7 | {
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} | https://www.semanticscholar.org/paper/0016f8f5f00b2804bfe60847a7cbf13224515fb7 | Vaporization and thermodynamics of ceramics in the Y2 O3 -ZrO2 -HfO2 system. | RATIONALE
The Y2 O3 -ZrO2 -HfO2 system is a promising base for a wide range of high temperature materials including ultra-high temperature ceramics. At high temperatures of synthesis and application of these ceramics the components may vaporize selectively, leading to changes in chemical composition and exploitation properties of the materials. Therefore, study of the vaporization processes of ceramics based on the Y2 O3 -ZrO2 -HfO2 system is of great importance. The thermodynamic properties of the Y2 O3 -ZrO2 -HfO2 system obtained in the present study can be used for prediction and modeling of physicochemical properties of ultra-high temperature ceramics.
METHODS
The present study was carried out by the high temperature Knudsen effusion mass spectrometric method using the MS-1301 mass spectrometer, which was designed to study the physicochemical properties of non-volatile compounds. Vapor species effusing from the tungsten twin effusion cell, which was used for vaporization of the samples under study, were ionized by electron ionization with an ionization energy of 30 eV.
RESULTS
Gaseous phase over the samples of the Y2 O3 -ZrO2 -HfO2 system was shown to consist of the YO, ZrO, ZrO2 , HfO and O vapor species at a temperature of 2660 K. The YO, ZrO, ZrO2 , HfO and O partial vapor pressures were obtained in a wide concentration range by the complete isothermal vaporization method, which allowed determination of the Y2 O3 , ZrO2 and HfO2 activities, Gibbs energies of mixing and excess Gibbs energies of the Y2 O3 -ZrO2 -HfO2 system at 2660 K.
CONCLUSIONS
Negative deviations from the ideal behavior were shown in the solid solutions of the Y2 O3 -ZrO2 -HfO2 system at 2660 K. The excess Gibbs energies found in the present study were approximated using the Redlich-Kister representation. The possibility of application of the Kohler method to estimate the excess Gibbs energies of the Y2 O3 -ZrO2 -HfO2 system was considered. | Rapid Communications in Mass Spectrometry | 2,019 | 14 | null | [
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{
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{
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001e8209c3a726a43bb4ba9d56699dfe7bc0cc1b | {
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} | null | https://www.semanticscholar.org/paper/001e8209c3a726a43bb4ba9d56699dfe7bc0cc1b | Synthesis and Characterization of Organic−Inorganic Hybrid Mesoporous Anion-Exchange Resins for Perrhenate (ReO4-) Anion Adsorption | Organic−inorganic hybrid mesoporous anion-exchange resins based on either pure silica or organosilica support materials were prepared and tested for the adsorption of perrhenate (ReO4-) anions in aqueous solutions. The prepared samples were characterized using nitrogen adsorption−desorption measurements, Fourier transform infrared spectroscopy, Raman spectroscopy, small-angle X-ray scattering, 29Si cross-polarization/magic-angle-spinning nuclear magnetic resonance, and scanning transmission electron microscopy. Among the prepared samples, the hybrid mesoporous anion-exchange resins functionalized with N-((trimethoxysilyl)propyl)-N,N,N-tri-n-butylammonium ions showed higher affinities for perrhenate ions than did the resins functionalized with N-((trimethoxysilyl)propyl)-N,N,N-trimethylammonium ions. The enhancement by the bulky ammonium functional ligand is consistent with Hofmeister selectivity. | 2,003 | 77 | null | [
{
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},
{
"authorId": "2103957866",
"name": "Lili Bao"
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{
"authorId": "47870489",
"name": "H. Im"
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"authorId": "2107497135",
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002d7ed6b5e4b539a39d89bb1f37eb8e64d77fa1 | {
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} | null | https://www.semanticscholar.org/paper/002d7ed6b5e4b539a39d89bb1f37eb8e64d77fa1 | Reactivity-Based One-Pot Synthesis of Oligosaccharides for the Development of a Photocleavable Sugar Array | 65 Abstract A major challenge in proteomics is to understand the functional impact of posttranslational modification, and protein glycosylation represents the most complex post-translational event. More than 50% of human proteins are glycosylated; however, the role of carbohydrates in glycoproteins is relatively unknown, due to the lack of tools for study. Carbohydrate arrays provide a solution to this long-standing problem. Using the programmable reactivity-based one-pot synthesis of oligosaccharides developed by Chi-Huey Wong allows a rapid access to a large number of oligosaccharides which have been very difficult to obtain by other means. These saccharides were then printed on silicon surface with a photocleavable linker for direct characterization by mass spectrometry and used for the high-throughput analysis of sugar-protein interaction. Reactivity-Based One-Pot Synthesis of Oligosaccharides for the Development of a Photocleavable Sugar Array | 2,011 | 0 | null | [
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{
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{
"authorId": "94121326",
"name": "Chi‐Huey Wong"
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] | null | null | 105 |
|
0033e0e4a6a2a65df1af5502af7c9e077a5ff269 | {
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} | https://www.semanticscholar.org/paper/0033e0e4a6a2a65df1af5502af7c9e077a5ff269 | Methodology Perspective of Computing Thermal Transport in Low-Dimensional Materials and Nanostructures: The Old and the New | Demands for engineering thermal transport properties are ever increasing for a wide range of modern micro- and nanodevices and materials-based energy technologies. In particular, there is a severe situation due to the rapid progress in the synthesis and processing of materials and devices with structural characteristic length on the nanometer scales, which are comparable or even smaller than the intrinsic length scales (such as mean free path and wavelength) of basic energy carriers (such as phonons, electrons, and photons). Although advanced approaches for controlling the electronic and photonic transport have been proposed in the past decades, progress on controlling lattice vibrations (i.e., the phonons) is still far behind. Gaps between the fundamental understandings of the behavior of the basic energy carriers at small scales and the technological demands still remain, particularly from a computer modeling point of view. Herewith, we give a perspective of the computational approaches for predicting the thermal transport properties of low-dimensional materials and nanostructures, which are mainly sorted into three categories: empirical molecular dynamics, anharmonic lattice dynamics based Boltzmann transport equation, and Landauer theory. The advantage and disadvantage of each method are discussed and some possible solutions are suggested. The discussion is focused on fully and accurately characterizing the mode-level phonon behavior, possible all-order phonon scattering process, and incorporation of realistic nanostructures. Moreover, emerging challenges of phonon coupling effects, such as electron–phonon, phonon–photon, and phonon–magnon coupling, are also discussed. We expect that this perspective will stimulate future research in computer modeling of micro-/nanoscale heat transfer beyond traditional phonons. | ACS Omega | 2,018 | 9 | null | [
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} | https://www.semanticscholar.org/paper/00370b27f9d8b611df46bd21e3834f948103cac7 | Synthesis and properties of the 5,10,15-trimesityltruxen-5-yl radical. | The synthesis of a long-lived, truxene-based radical that is highly delocalized and exhibits a narrow EPR absorption is reported. The radical is stable for multiple hours in a solution exposed to air and remains for months in the solid state under inert gas. Characterization and properties are discussed. | Organic Letters | 2,013 | 17 | {
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00386006a256f30f09e5e80b205d371932174c92 | {
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} | https://www.semanticscholar.org/paper/00386006a256f30f09e5e80b205d371932174c92 | A Pyridine Alkoxide Chelate Ligand That Promotes Both Unusually High Oxidation States and Water-Oxidation Catalysis. | Water-oxidation catalysis is a critical bottleneck in the direct generation of solar fuels by artificial photosynthesis. Catalytic oxidation of difficult substrates such as water requires harsh conditions, so the ligand must be designed both to stabilize high oxidation states of the metal center and to strenuously resist ligand degradation. Typical ligand choices either lack sufficient electron donor power or fail to stand up to the oxidizing conditions. Our research on Ir-based water-oxidation catalysts (WOCs) has led us to identify a ligand, 2-(2'-pyridyl)-2-propanoate or "pyalk", that fulfills these requirements. Work with a family of Cp*Ir(chelate)Cl complexes had indicated that the pyalk-containing precursor gave the most robust WOC, which was still molecular in nature but lost the Cp* fragment by oxidative degradation. In trying to characterize the resulting active "blue solution" WOC, we were able to identify a diiridium(IV)-mono-μ-oxo core but were stymied by the extensive geometrical isomerism and coordinative variability. By moving to a family of monomeric complexes [IrIII/IV(pyalk)3] and [IrIII/IV(pyalk)2Cl2], we were able to better understand the original WOC and identify the special properties of the ligand. In this Account, we cover some results using the pyalk ligand and indicate the main features that make it particularly suitable as a ligand for oxidation catalysis. The alkoxide group of pyalk allows for proton-coupled electron transfer (PCET) and its strong σ- and π-donor power strongly favors attainment of exceptionally high oxidation states. The aromatic pyridine ring with its methyl-protected benzylic position provides strong binding and degradation resistance during catalytic turnover. Furthermore, the ligand has two additional benefits: broad solubility in aqueous and nonaqueous solvents and an anisotropic ligand field that enhances the geometry-dependent redox properties of its complexes. After discussion of the general properties, we highlight the specific complexes studied in more detail. In the iridium work, the isolated mononuclear complexes showed easily accessible Ir(III/IV) redox couples, in some cases with the Ir(IV) state being indefinitely stable in water. We were able to rationalize the unusual geometry-dependent redox properties of the various isomers on the basis of ligand-field effects. Even more striking was the isolation and full characterization of a stable Rh(IV) state, for which prior examples were very reactive and poorly characterized. Importantly, we were able to convert monomeric Ir complexes to [Cl(pyalk)2IrIV-O-IrIVCl(pyalk)2] derivatives that help model the "blue solution" properties and provide groundwork for rational synthesis of active, well-defined WOCs. More recent work has moved toward the study of first-row transition metal complexes. Manganese-based studies have highlighted the importance of the chelate effect for labile metals, leading to the synthesis of pincer-type pyalk derivatives. Beyond water oxidation, we believe the pyalk ligand and its derivatives will also prove useful in other oxidative transformations. | Accounts of Chemical Research | 2,017 | 73 | null | [
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} | null | https://www.semanticscholar.org/paper/00393eec25d1b09b35c8ec4d610ac2e1651f0b71 | Group 5 doped anatase films prepared by aqueous chemical solution deposition | The development of transparent conducting oxides (TCOs) has led to the evolution of a variety of optoelectronic devices. There exists, however, a demand for inexpensive, and efficient materials. Anatase titanium dioxide (TiO2) is such a promising TCO compound. The substitution of group 5 elements for Ti will introduce charge carriers, improving the electrical conductivity of the material. A remaining obstacle for the commercialization of TCOs is that reliable synthesis routes have to be developed that allow mass production at reasonable cost. In this respect solution based processing and deposition is an appealing alternative to standard physical deposition methods that require a high vacuum. However, to our knowledge, reports on solution processing of anatase based TCOs are very scarce. In the current work we present the preparation of group 5 (V, Nb, Ta) doped anatase films by aqueous chemical solution deposition (ACSD). The effect of the dopant on the crystallization, microstructure and electrical properties of the resulting films is examined. To observe the evolution of the film characteristics in real time, in-situ characterization of the crystal structure and sheet resistance is carried out during annealing of these thin films. Nb-doped TiO2 films show the most promising electrical properties. By this work we demonstrate that ACSD in the future may provide a new strategy for TCO production. | 2,011 | 0 | null | [
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"name": "Boris Capon"
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003c625a4672d83ce1cf1b6608fde61b4450a730 | {
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} | null | https://www.semanticscholar.org/paper/003c625a4672d83ce1cf1b6608fde61b4450a730 | Synthesis, Optical Characterization, and Thermal Decomposition of Complexes Based on Biuret Ligand | Four complexes were synthesized in methanol solution using nickel acetate or nickel chloride, manganese acetate, manganese chloride, and biuret as raw materials. The complexes were characterized by elemental analyses, UV, FTIR, Raman spectra, X-ray powder diffraction, and thermogravimetric analysis. The compositions of the complexes were [Ni(bi)2(H2O)2](Ac)2·H2O (1), [Ni(bi)2Cl2] (2), [Mn(bi)2(Ac)2]·1.5H2O (3), and [Mn(bi)2Cl2] (4) (bi = NH2CONHCONH2), respectively. In the complexes, every metal ion was coordinated by oxygen atoms or chlorine ions and even both. The nickel and manganese ions were all hexacoordinated. The thermal decomposition processes of the complexes under air included the loss of water molecule, the pyrolysis of ligands, and the decomposition of inorganic salts, and the final residues were nickel oxide and manganese oxide, respectively. | 2,016 | 9 | {
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{
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"name": "G. Zhong"
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{
"authorId": "2119324149",
"name": "Ling Chen"
}
] | http://downloads.hindawi.com/journals/ijo/2016/5471818.pdf | downloads.hindawi.com | 110 |
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003d869026d955dabcfab3979b3564ea8720f954 | {
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} | https://www.semanticscholar.org/paper/003d869026d955dabcfab3979b3564ea8720f954 | Amphiphilic asymmetric comb copolymer with pendant pyrene groups and PNIPAM side chains: synthesis, photophysical properties, and self-assembly. | An amphiphilic asymmetric comb polymer with pendant pyrene groups and poly(N-isopropylacrylamide) (PNIPAM) side chains was synthesized based on click chemistry and reversible addition-fragmentation chain transfer polymerization. Gel permeation chromatography, FTIR, and (1)H NMR results all indicated successful synthesis of a well-defined comb polymer. The photophysical properties and self-assembly of the polymer in solution were studied by UV-vis spectroscopy, fluorescence technique, and transmission electron microscopy. The intensity ratio of the excimer peak (I(E)) to the monomer peak (I(M)) of the comb polymer in THF was used to monitor the formation of inter- or intramolecular excimers. At low polymer concentration, the value of I(E)/I(M) kept unchanged, indicating the formation of intramolecular excimer; at high polymer concentration, the value increased rapidly with concentration because of the formation of intermolecular excimer. The change of the intensity ratio of the first to the third vibronic band (I(1)/I(3)) on the monomer emission of the comb polymer also proved the association of the pendant pyrene groups in THF at high polymer concentration. In aqueous solution, the comb polymer chains self-assembled into vesicles with pyrene groups in the walls and PNIPAM side chains in the coronae. The value of the critical aggregation concentration of the polymer was determined by fluorescence technique. Temperature exerted a significant effect on the size and morphology of the vesicles. At a temperature above the lower critical solution temperature (LCST) of PNIPAM, PNIPAM brushes in the coronae of vesicles collapsed on the surface of the structures forming nanosized domains, and vesicles with smaller size were obtained. Fluorescence quenching experiments indicated that the collapsed PNIPAM chains protected a part of pyrene groups from being quenched by nitromethane at a temperature above the LCST of PNIPAM. | Journal of Physical Chemistry B | 2,010 | 36 | null | [
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{
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{
"authorId": "144120921",
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] | null | null | 111 |
003d895c3a1eae262f46c84630316cf60011b43f | {
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} | null | https://www.semanticscholar.org/paper/003d895c3a1eae262f46c84630316cf60011b43f | Synthesis and Characterization of TiO2 Nanoreservoirs Supported with Platinum II and Sodium Bicarbonate Solution | In the past 10 years, the nanoreservoirs to based on TiO2 have taken the lead to develop new and better ways to control and possible “removal” of diseases that have bewildered mankind since its existence. In seeking to contribute to these expectations, at this early stage we synthesized nanoreservoirs of TiO2 with sodium bicarbonate solution to 15% (NaHCO3-15/TiO2), with salt of platinum(II) to 0.1% (Pt-0.1/TiO2) and with the NaHCO3 15% and the platinum(II) 0.1% “in situ” (Pt-0.1-NaHCO3-15/TiO2) by sol-gel. We show that TiO2 and Pt-0.1/TiO2 nanoreservoirs are amorphous. While the NaHCO3-15/TiO2 and the Pt-0.1-NaHCO3-15/TiO2 nanoreservoirs are crystalline. The NaHCO3-15/TiO2 and Pt-0.1-NaCO3-15/TiO2 nanoreservoirs are crystalline because to transformation of the sodium bicarbonate (NaHCO3) to trona phase. The trona phase increases the average particle size of the Pt-0.1-NaCO3-15/TiO2 nanoreservoirs of 180 nm to 130 nm (NaHCO3-15/TiO2). The nanoreservoirs doped with platinum decreases the particle size to 50 nm (Pt-0.1/TiO2). | 2,015 | 1 | null | [
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"name": "Rodrlguez"
},
{
"authorId": "2075207630",
"name": "Fernando"
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] | null | null | 112 |
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004352fc037a3e28401583d550a9f16029e423c8 | {
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} | null | https://www.semanticscholar.org/paper/004352fc037a3e28401583d550a9f16029e423c8 | PVDF membranes containing hybrid nanoparticles for adsorbing cationic dyes: physical insights and mechanism | In this study, Fe (iron) and Ag (silver) based adsorbents were synthesized using solution combustion and in situ reduction techniques. The synthesized adsorbents were comprehensively characterized by different techniques including electron microscopy, BET, XRD, Zeta potential etc. Three chlorinated cationic dyes used were malachite green, methyl violet and pyronin Y. These dyes were adsorbed on various synthesized adsorbents [iron III oxide (Fe2O3)], iron III oxide decorated silver nanoparticles by combustion synthesis technique [Fe2O3–Ag(C)] and iron III oxide decorated silver nanoparticles using in situ reduction, [Fe2O3–Ag (S)]. The isotherm and the adsorption kinetics have been studied systematically. The kinetic data can be explained by the pseudo second order model and the adsorption equilibrium followed Langmuir isotherm. The equilibrium and kinetics results suggest that Fe2O3–Ag(S) nanoparticles showed the maximum adsorption among all the adsorbents. Hence, Polyvinylidene fluoride based membranes containing Fe2O3–Ag(S) nanoparticles were prepared via phase inversion (precipitation immersion using DMF/water) technique. The adsorption kinetics were studied in detail and it was observed that the composite membrane showed synergistic improvement in dye adsorption. Such membranes can be used for water purification. | 2,016 | 4 | null | [
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{
"authorId": "5557978",
"name": "G. Madras"
},
{
"authorId": "9911171",
"name": "S. Bose"
}
] | null | null | 113 |
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0044b7b8d7c386f43087bc625ea541aa364a6e4f | {
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} | null | https://www.semanticscholar.org/paper/0044b7b8d7c386f43087bc625ea541aa364a6e4f | Combustion Synthesis of CoCrMo Alloys | CoCrMo alloys were prepared by combustion synthesis method.The experimental results showed that the yielded alloys were solid solution based on Co and mainly constituted by e phase of close-packed hexagonal and γ phase of face-centered cubic.The residue was contained of Al2O3.Microstructure of alloys was cast dendritic histology and interdendritic segregation existed;moreover,Co was rich in pine-tree crystal and Mo was rich in interdendritic.Furthermore,combustion synthesis may induce martensite phase change which made γ-Co phase change to e-Co phase and banding metastructure appeared in martensite section. | 2,008 | 1 | null | [
{
"authorId": "115810102",
"name": "Wu Laihong"
}
] | null | null | 114 |
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00466652bd1d522f317737f7527dff2a4474cc58 | {
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} | null | https://www.semanticscholar.org/paper/00466652bd1d522f317737f7527dff2a4474cc58 | Fatigue assessment of steel rollers by means of the local energy | This paper aims to analyses the fatigue behavior of steel rollers using the average strain energy density (SED) criterion. Considering the variability of the V-notch opening angle, a simple scalar quantity, i.e. the value of the strain energy density averaged in a control volume surrounding the notch tip, has been introduced to overcome the complexities in failure assessment of this component. The strain energy is obtained using close form solutions based on the relevant Notch Stress Intensity Factors (NSIF) for modes I, II and III. Referring to the conventional arc welding processes, the radius of the control volume is carefully identified with reference to conventional arc welding processes being equal to 0.28 mm for welded joints made of steel. In this paper firstly the employed methodology for the fatigue assessment is described and then the first synthesis of fatigue data by means of local SED for a specific geometry is shown. | 2,017 | 0 | null | [
{
"authorId": "101531491",
"name": "F. Chebat"
},
{
"authorId": "40309807",
"name": "M. Cincera"
},
{
"authorId": "113368443",
"name": "S. Razavi"
},
{
"authorId": "115019646",
"name": "F. Berto"
},
{
"authorId": "2653460",
"name": "T. Welo"
}
] | null | null | 115 |
|
004da79c2c78f4851d0d96cfdf83120a566ce74b | {
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} | null | https://www.semanticscholar.org/paper/004da79c2c78f4851d0d96cfdf83120a566ce74b | Amphiphilic Unimolecular Nanoparticles Based on a Hyperbranched Polyacrylate Core and a PNIPAm Shell: Synthesis via ATRP and Properties | A novel amphiphilic unimolecular nanoparticle, multi-HPBPEA-g-PNIPAm, for encapsulation and release of hydrophobic guest molecules, is developed. The polymer shows core–shell architecture and is synthesized from inimer 2-((2-bromopropionyl)oxy)ethyl acrylate (BPEA) by atom transfer radical polymerization (ATRP) in three steps. The hydrophobic core (multi-HPBPEA) is composed of hyperbranched poly(2-((2-bromopropionyl)oxy)ethyl acrylate) (HPBPEA), which is synthesized by self-condensing vinyl polymerization (SCVP) of BPEA. Multi-HPBPEA-g-PNIPAm is obtained by multi-HPBPEA core initiating ATRP of N-isopropylacrylamide (NIPAm). The encapsulation behavior of the core of multi-HPBPEA-g-PNIPAm in an aqueous solution is investigated by fluorescent spectra. It is found that multi-HPBPEA-g-PNIPAm can efficiently encapsulate and release a hydrophobic drug like nifedipine. | 2,013 | 14 | null | [
{
"authorId": "48694268",
"name": "Yong Cai"
},
{
"authorId": "47909451",
"name": "Yuyang Liu"
}
] | null | null | 116 |
|
004e21ae86839d9da6d152b8958f3c887e2bc854 | {
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} | null | https://www.semanticscholar.org/paper/004e21ae86839d9da6d152b8958f3c887e2bc854 | Free-Standing Vertical Gold Nanowires from Template Synthesis | Submitted for the MAR05 Meeting of The American Physical Society Free-Standing Vertical Gold Nanowires from Template Synthesis WOO-JOONG KIM, STEPHEN CARR, MARTIN WYBOURNE, Dartmouth College — Gold nanowires are electrochemically grown in a track-etched polycarbonate membrane inside a Teflon cell containing gold plating solution. Using this method we have grown gold nanowires with diameters in the range of 20 200 nm and lengths on the order of 1 10 um. By controlling the membrane-dissolving process, we can deposit randomly oriented nanowires with the length in the plane of a substrate, or we can leave the nanowires vertically free-standing with one end still attached to a conducting base. We are currently exploring the vertical configuration in order to study the physics of individual nanowires or groups of nanowires. Quantities of interest include the cantilever mechanical resonance frequencies and the mechanical quality factor. Woo-Joong Kim Dartmouth College Date submitted: 06 Dec 2004 Electronic form version 1.4 | 2,005 | 0 | null | [
{
"authorId": "113306613",
"name": "Woo-Joong Kim"
},
{
"authorId": "145429618",
"name": "S. Carr"
},
{
"authorId": "12345125",
"name": "M. Wybourne"
}
] | null | null | 117 |
|
004fe04eb1688eb8a98a544b67c3602c67149997 | {
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} | null | https://www.semanticscholar.org/paper/004fe04eb1688eb8a98a544b67c3602c67149997 | Morphology controllable synthesis of yttrium oxide-based phosphors from yttrium citrate precursors | A novel yttrium citrate-templated conversion method for morphology controlled synthesis of Y2O3 microspheres, microflowers and microsheets was reported for the first time. The precursors with controllable morphologies were synthesized with a homogenous precipitation method in aqueous solution without any surfactant. Y2O3 samples with well-preserved morphological architectures were obtained by a subse-quent thermal transformation strategy. The chemical formula of the precursor was identified and a two-stage growth mechanism was proposed. The effects of the aging time, reaction temperature, reactant concentration and molar ratio of yttrium nitrate to sodium citrate were discussed. The photoluminescence properties of the Y2O3:Eu3+ microspheres, microflowers and microsheets prepared were also studied. | 2,011 | 0 | null | [
{
"authorId": "91967818",
"name": "黄满莲"
},
{
"authorId": "71499300",
"name": "郭凯"
},
{
"authorId": "91928550",
"name": "满振勇"
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{
"authorId": "91576396",
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{
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{
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"name": "许钫钫"
},
{
"authorId": "91236354",
"name": "赵景泰"
}
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|
0051fbb2660c6acd0910b4ee079d7ce6ec9bcab2 | {
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} | null | https://www.semanticscholar.org/paper/0051fbb2660c6acd0910b4ee079d7ce6ec9bcab2 | Synthesis of phosphorylated rust metamorphoses and its comparative corrosion study on steel samples simulated in different atmospheres | Purpose
The aim of this study was to evaluate the corrosion inhibition efficiency of steel samples in different environments before and after the treatment with rust metamorphose (RM), which is formulated in this research study and shows excellent adherence over the rusted surface of substrate because of the presence of the P-O-Fe bond.
Design/methodology/approach
An RM solution (phosphorylated polyphenol) was synthesised and characterised using Fourier transform infrared spectroscopy (FT-IR), and then the degree of protection offered by it to steel surfaces with and without the treatment with the RM solution in different atmospheres was evaluated;. Before and after treating with the RM solution, the corroded steel samples were characterised using X-ray diffraction (XRD), FT-IR, scanning electron microscopy (SEM) and energy dispersive spectroscopy (EDS). The study of the passive behaviours of the corroded steel samples and RM-treated steel samples was done in different simulated atmospheres.
Findings
This RM solution is phosphorylated polyphenol solution (proved by FT-IR), which acts as a corrosion inhibitor on corroded steel surfaces because of the formation of a passive and symmetric adherent layer of phosphorylated polyphenol–iron complex (confirmed by FT-IR, XRD, EDS, SEM and adhesion X test). The significant improvement in corrosion resistance in splash conditions of 3.5 per cent NaCl, tap water and 1.5 per cent Na2SO4 was found with the treatment of phosphorylated polyphenol-based RM.
Originality/value
The development of RM and its characterisation with performance evaluation in different atmospheres is a novel approach in this research. | 2,016 | 2 | null | [
{
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"name": "R. Jain"
},
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{
"authorId": "66796006",
"name": "M. Bhadu"
},
{
"authorId": "2561257",
"name": "K. Swarnkar"
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0052279818e631fe45eff7d4193e208753fa416a | {
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} | https://www.semanticscholar.org/paper/0052279818e631fe45eff7d4193e208753fa416a | Effect of Olive-Pine Bottom Ash on Properties of Geopolymers Based on Metakaolin | In this research, the feasibility of using bottom ashes generated by the combustion of biomass (olive pruning and pine pruning) as a source of aluminosilicates (OPBA) has been studied, replacing the metakaolin precursor (MK) in different proportions (0, 25, 50, 75, and 100 wt.% substitution) for the synthesis of geopolymers. As alkaline activator an 8 M NaOH solution and a Na2SiO3 have been used. The geopolymers were cured 24 h in a climatic chamber at 60 °C in a water-saturated atmosphere, subsequently demoulded and cured at room temperature for 28 days. The results indicated that the incorporation of OPBA waste, which have 19.7 wt.% of Ca, modifies the characteristics of the products formed after alkaline activation. In general terms, the incorporation of increasing amounts of calcium-rich ashes results in geopolymers with higher bulk density. The compressive strength increases with the addition of up to 50 wt.% of OPBA with respect to the control geopolymers, contributing the composition of the residue to the acquisition of better mechanical behavior. The results indicate the potential use of these OPBA waste as raw material to produce unconventional cements with 28-day curing strengths greater than 10 MPa, and thermal conductivities less than 0.35 W/mK. | Materials | 2,019 | 20 | {
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{
"authorId": "1414514778",
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"authorId": "1500694171",
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{
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"name": "L. Pérez-Villarejo"
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{
"authorId": "145678712",
"name": "E. Castro"
},
{
"authorId": "1402279182",
"name": "D. Eliche-Quesada"
}
] | https://www.mdpi.com/1996-1944/13/4/901/pdf | www.mdpi.com | 120 |
00522e1f87e736db86d1c0d6b5e6d47ce1b1b767 | {
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} | null | https://www.semanticscholar.org/paper/00522e1f87e736db86d1c0d6b5e6d47ce1b1b767 | Towards the development of controllable and reversible 'on-off' luminescence switching in soft-matter; synthesis and spectroscopic investigation of 1,8-naphthalimide-based PET (photoinduced electron transfer) chemosensors for pH in water-permeable hydrogels | The synthesis of the pH PET sensors 1 and 2 is described. These molecules display ‘on-off’ switching in their fluorescence as a function of pH in aqueous solution. From the luminescent changes pKa values of 8.4(±0.1) and 6.3(±0.1) were determined respectively. These compounds were incorporated into poly[methylmethacrylate-co-2-(hydroxyethylmethacrylate)]-based hydrogels and the luminescent properties of the resulting polymeric films were investigated using confocal laser-scanning microscopy. Both sensors showed substantial luminescent switching in the soft-matter, where the emission was ‘switched off’ after treating the hydrogels with alkaline solution and ‘switched on’ under acidic conditions. | 2,003 | 53 | {
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{
"authorId": "4384054",
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{
"authorId": "5757466",
"name": "C. McCoy"
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{
"authorId": "27936314",
"name": "R. Morrow"
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"authorId": "2279038883",
"name": "Caroline Phelan"
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] | https://www.arkat-usa.org/get-file/18982/ | www.arkat-usa.org | 121 |
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005286cf987ec4fd863d127c29fc8552f86b7e3c | {
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} | null | https://www.semanticscholar.org/paper/005286cf987ec4fd863d127c29fc8552f86b7e3c | Improvement of synthetic method of carvone perfume | L-carvone is an important perfume. It is widely applied to food industry and chemical industry, especially in toothpaste, candy, chewing-gum and different drinks. Therefore the synthesis of L-carvone has important economic value. There are several different methods to synthesize it, but these methods have some drawbacks. This paper discusses the improvement of the synthetic method of L-carvone based on the home and abroad literatures. The production cost has been reduced by optimizing reaction steps, pH value of solution, and solvents. Simple in technology the improved method has, good yield and better practical value. | 2,003 | 0 | null | [
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} | https://www.semanticscholar.org/paper/0054de1914432fff82521202f439263cd3eae4c9 | Pyridazine- versus pyridine-based tridentate ligands in first-row transition metal complexes. | A series of first-row transition metal complexes with the unsymmetrically disubstituted pyridazine ligand picolinaldehyde (6-chloro-3-pyridazinyl)hydrazone (PIPYH), featuring an easily abstractable proton in the backbone, was prepared. Ligand design was inspired by literature-known picolinaldehyde 2-pyridylhydrazone (PAPYH). Reaction of PIPYH with divalent nickel, copper, and zinc nitrates in ethanol led to complexes of the type [Cu(II)(PIPYH)(NO(3))(2)] (1) or [M(PIPYH)(2)](NO(3))(2) [M = Ni(II) (2) or Zn(II) (3)]. Complex synthesis in the presence of triethylamine yielded fully- or semideprotonated complexes [Cu(II)(PIPY)(NO(3))] (4), [Ni(II)(PIPYH)(PIPY)](NO(3)) (5), and [Zn(II)(PIPY)(2)] (6), respectively. Cobalt(II) nitrate is quantitatively oxidized under the reaction conditions to [Co(III)(PIPY)(2)](NO(3)) (7) in both neutral and basic media. X-ray diffraction analyses reveal a penta- (1) or hexa-coordinated (2, 3, and 7) metal center surrounded by one or two tridentate ligands and, eventually, κ-O,O' nitrate ions. The solid-state stoichiometry was confirmed by electron impact (EI) and electrospray ionization (ESI) mass spectrometry. The diamagnetic complexes 5 and 6 were subjected to (1)H NMR spectroscopy, suggesting that the ligand to metal ratio remains constant in solution. Electronic properties were analyzed by means of cyclic voltammetry and, in case of copper complexes 1 and 4, also by electron paramagnetic resonance (EPR) spectroscopy, showing increased symmetry upon deprotonation for the latter, which is in accordance with the proposed stoichiometry [Cu(II)(PIPY)(NO(3))]. Protic behavior of the nickel complexes 2 and 5 was investigated by UV/vis spectroscopy, revealing high π-backbonding ability of the PIPYH ligand resulting in an unexpected low acidity of the hydrazone proton in nickel complex 2. | Inorganic Chemistry | 2,011 | 26 | null | [
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00593a8df8c199d5d065a8c549bed12ee64bd461 | {
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} | null | https://www.semanticscholar.org/paper/00593a8df8c199d5d065a8c549bed12ee64bd461 | Synthesis and characterization of an azobenzene- and acrylamide-based photoresponsive copolymer and gel | This article reports the synthesis and characterization of a new type of copolymer consisting of acrylamide and trans-4-methacroyloxyazobenzene and their gel. Free-radical polymerization initiated with 2,2′-azobisisobutyronitrile was used to conduct the synthesis although N,N′-methylene bisacrylamide was used as a crosslinking agent for the gel synthesis. Despite the insolubility of the different monomers in a single solvent, a certain ratio of water/tetrahydrofuran (THF) enabled the propagating species to stay in the solution and thus to facilitate chain growth. The solubility, Fourier transform infrared spectra, and solid-state 13C NMR investigations revealed that two monomers in the copolymer were chemically bonded. The compositions of the incorporated acrylamide and azobenzene in the copolymer and the gel were determined by NMR spectroscopy. Because the potential actuating behavior of such materials was due to the volume change involved in reversible solvent uptake, the sorption and evaporation of the gel were also investigated and showed that the gel could absorb about 460% water, which corresponded to a polymer content of the weight gel of 18% and was compatible with thermogravimetric analysis of a saturated gel that revealed about 83 wt % of a swollen gel was lost within 12 h. Finally, photoinduced trans–cis isomerization kinetics of the copolymer was investigated in a 30:70 mixture of water and THF against irradiation time. A photostationary state was reached within 5.5 min with a corresponding conversion of 70% of the trans isomer to the cis form. © 2004 Wiley Periodicals, Inc. J Polym Sci Part A: Polym Chem 42: 2886–2896, 2004 | 2,004 | 26 | {
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] | https://onlinelibrary.wiley.com/doi/pdfdirect/10.1002/pola.20108 | onlinelibrary.wiley.com | 124 |
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005e3c472ebf95511b65946c8de3c8fbc504b092 | {
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} | null | https://www.semanticscholar.org/paper/005e3c472ebf95511b65946c8de3c8fbc504b092 | Method for preparing carbon black inclusion pigment in situ by nonhydrolytic sol-gel process | The invention provides a method for preparing carbon black inclusion pigment in situ by nonhydrolytic sol-gel process. The method comprises the following steps of: adopting anhydrous zirconium source and anhydrous silicon source as precursors, adopting chloroalkane or anhydrous low-carbon alcohol as a solvent, adopting fluoride as a mineralizing agent, adding an organic compound capable of generating carbon black in situ into precursor mixing solution, forming zirconium silicate gel by condensation, backflowing and volume-bomb treatment, drying and grinding gel, putting the gel in an alumina crucible for sealed forging, then carrying out unsealed forging and obtaining zirconium-silicate-based carbon black inclusion pigments. The method solves the control difficult problem for dispersion and granularity in externally adding carbon black thoroughly, has the characteristics of high synthesis rate and low synthesis temperature, not only is the preparation process simplied, but also the pollution of carbon-black dust is eliminated. | 2,011 | 0 | null | [
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005faf274a5f7383fc435545db21ea84d9b574c0 | {
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} | null | https://www.semanticscholar.org/paper/005faf274a5f7383fc435545db21ea84d9b574c0 | Synthesis and UCST‐type phase behavior of OEGylated poly(γ‐benzyl‐l‐glutamate) in organic media | A series of OEGylated poly(γ-benzyl-l-glutamate) with different oligo-ethylene-glycol side-chain length, molecular weight (MW = 8.4 × 103 to 13.5 × 104) and narrow molecular weight distribution (PDI = 1.12–1.19) can be readily prepared from triethylamine initiated ring-opening polymerization of OEGylated γ-benzyl-l-glutamic acid based N-carboxyanhydride. FTIR analysis revealed that the polymers adopted α-helical conformation in the solid-state. While they showed poor solubility in water, they exhibited a reversible upper critical solution temperature (UCST)-type phase behavior in various alcoholic organic solvents (i.e., methanol, ethanol, 1-propanol, 1-butanol, 1-pentanol, and isopropanol). Variable-temperature UV–vis analysis revealed that the UCST-type transition temperatures (Tpts) of the resulting polymers were highly dependent on the type of solvent, polymer concentration, side- and main-chain length. © 2015 Wiley Periodicals, Inc. J. Polym. Sci., Part A: Polym. Chem. 2015 | 2,016 | 12 | null | [
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"authorId": "5417027",
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] | null | null | 126 |
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} | null | https://www.semanticscholar.org/paper/005fd9a4f52101116ac29df58ae4746de81cb7bb | Design, Synthesis, and Characterization of Functional Materials for Battery Electrolyte and Marine Antifouling Applications | In this thesis, challenges associated with the creation of anti-fouling surfaces and polymer-based electrolytes are addressed using a versatile polymer chemistry that affords control over material functionality through the manipulation of the polymer’s side chain composition. The polymers used in this thesis generally have a backbone comprised in-part or wholly of poly(ethylene oxide) (PEO) with pendant allyl side groups, to which various moieties can be attached using a straightforward thio-ene click. I describe the attachment of different side groups to design polymers with desirable properties, then characterize these polymers’ performance when used as anti-fouling surface coatings and electrolytic solutions.The development of high lithium cation transference number electrolytes, those in which the ionic conductivity is carried predominantly by the lithium ion instead of its counteranion, could limit concentration polarization that plagues current battery electrolytes. The typical approach for achieving high transference number electrolytes is to immobilize the anion on a polymer to limit anion motion. We designed a lithium neutralized PEO backbone with pendent sulfonate groups to use as a dry single ion conductor. Interestingly, these sulfonate functionalized materials self-assembled into very well ordered, small (2.5nm) lamellae, which result from aggregation and phase segregation of the attached ions from the polymer backbone. Unfortunately, given that the ions are not solvated (i.e., dissociated) by the polymer backbone, no conductivity was observed in these materials, including at high (120°C) temperatures. The lack of ion dissociation suggests that a solvent with higher Lewis basicity or acidity than the PEO backbone is needed to disrupt the contact ion pairs and allow conductivity.Polyelectrolyte solutions were therefore prepared from the polyanion described above and a strong Lewis basic solvent, dimethyl sulfoxide. These solutions exhibited an excellent combination of high ionic conductivity and Li+ transference number (e.g., 1.2 mS/cm and 0.99, respectively, at 25°C). In addition, this system is tunable (polyanion molecular weight and charge concentration can be manipulated), and provided a platform to explore the tradeoff between conductivity and transference number in liquid electrolytes with an unprecedented combination of both. Taking advantage of this tunability, I explored the effect of temperature, polymer molecular weight, solvent choice, and small molecule salt addition on the solution transport properties. Li+ transference number was found to be temperature independent, as expected for solutions that are fully dissociated at all temperatures measured. Scaling theories for molecular weight dependence of diffusion coefficients described the polymer behavior well but did not capture the behavior of the lithium cation, which was generally found to be independent of polymer molecular weight. Solutions made in a variety of solvents all displayed high cation transference number and high conductivity, but there was no simple relationship between solvent and electrolyte properties. Finally, when mixed into the polyelectrolyte solution, small molecule salts, such as LiTFSI, increase the solution conductivity, but at a substantial cost to Li+ transference number.In another application, I designed polymer materials that prevent marine fouling, the attachment of organisms to human-made structures in marine environments. Amphiphilic polymers have been shown to be effective as antifouling materials against a variety of organisms and organic compounds. We therefore designed a polymer platform to present sequence-specific peptoids at the surface of thin film coatings. These amphiphilic coatings were used to study the effect of hydrophobic and hydrophilic residue sequence on antifouling performance. The polymer platform had a polystyrene (PS) anchoring block, and a PEO presentation block to which peptoids were attached. We showed that fluorinated moieties are very surface active and direct the surface composition of the polymer thin film. The position and number of fluorinated groups in the polypeptoid was shown to affect both the surface composition and antifouling properties of the film. Specifically, the position of the fluorinated units in the peptoid chain changes the surface chemistry and the antifouling behavior, while the number of fluorinated residues affects the fouling release properties.In addition to the peptoid sequence, the specific composition of the polymer platform is an important consideration for film stability and surface presentation. The anchoring block molecular weight plays an important role in film stability, but also affects the overall film hydrophobicity, which adversely affects antifouling performance. It was found that the coatings using an entirely hydrophobic scaffold, polystyrene-b-poly(dimethyl siloxane), performed well against only one of the marine organisms studied (Ulva linza), but that hydrophilic coatings comprised of polystyrene-b-poly(ethylene oxide) performed well against all marine organisms studied, including U. linza and Navicula. Finally, it was shown that perfluorooctane thiol attached directly to the polymer chain can direct surface presentation of the entire polymer system, thereby allowing improved anti-fouling film formation. | 2,017 | 0 | null | [
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"name": "Hilda G. Buss"
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0067923e545555f6d9d4c7d8a45181e3262401e2 | {
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} | null | https://www.semanticscholar.org/paper/0067923e545555f6d9d4c7d8a45181e3262401e2 | Elaboration et caractérisation de ciments géopolymères à base de scories volcaniques | Two types of volcanic ashes referenced as ZD (volcanic ashes from Djoungo) and ZG (volcanic ashes from Galim) were collected from two Cameroonian localities. They were characterized (chemical and mineralogical compositions, amorphous phase content, particle size distribution and specific surface area) and used as raw materials for the synthesis of geopolymer cements at ambient temperature of laboratory (24 ± 3 °C). The synthesized products were characterized by determining their setting time, linear shrinkage and compressive strength, X-ray Diffraction, Fourier Transform Infrared Spectroscopy and Scanning Electron Microscopy. The mineralogical composition, the amorphous phase content, the particle size distribution, the specific surface area of the volcanic ashes as well as the mass ratio of the alkaline solution (sodium silicate / sodium hydroxide) were the main parameters which influenced the synthesis of geopolymers with interesting characteristics at ambient temperature (24 ± 3 °C). The volcanic ashes (ZD) whose mineralogical composition contained anhydrite, low amorphous phase content and low specific surface area led to long setting times. Moreover, its products swelled and presented cracks due to the formation of ettringite and these resulted in low compressive strengths (7 to 19 MPa). The volcanic ashes (ZG) containing high amounts of amorphous phase and high specific surface area led geopolymers with setting times between 490 and 180 minutes and compressive strength between 7 and 50 MPa at ambient temperature of laboratory.
The properties of geopolymers were improved when elaborated with a mixture of volcanic ashes and metakaolin (ZD–MK and ZG–MK). For geopolymers obtained from ZD–MK, the setting time was between 500 and 160 minutes while it was between 220 and 125 minutes for geopolymers obtained from ZG–MK. The compressive strength greatly increased between 23 and 68 MPa and 39 and 64 MPa for geopolymers obtained from ZG –MK and ZD–MK respectively.
A comparative study of the properties of mixtures of metakaolin–alumina and volcanic ash–alumina based geopolymers shows that metakaolin is a good source of Al2O3 and SiO2 and which highly reactive with alkaline solution and produces geopolymers with better characteristics compared to volcanic ash based–geopolymer. The properties of volcanic ash–based geopolymer were also improved when amorphous alumina was incorporated into the volcanic ash. This additive is used to compensate the deficiencies in Al2O3 content in the volcanic ash. Compare to when volcanic ash is used alone 20 to 40 % incorporation of this additive corresponded to increases of the compressive strength by 18.1 % for metakaolin-alumina based-geopolymers and by 32.4 % for volcanic ash-based geopolymers. | 2,013 | 9 | null | [
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00697c6da160367839ac246e822b8b5d4c76a10d | {
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} | null | https://www.semanticscholar.org/paper/00697c6da160367839ac246e822b8b5d4c76a10d | ANTIMICROBIAL ACTIVITY OF NATURAL DYES AND PIGMENTS OBTAINED FROM MORINDA CITRIFOLIA L. AND TERMINALIA CATAPPA L. LEAVES | The global consciousness reveals about the use of eco-friendly natural dyes in textiles and food industries instead of hazardous and carcinogenic synthetic dyes. Many of the plant materials, from which natural dyes are obtained, found to have some medicinal values. During the present study, dying materials were prepared from leaves of Morinda citrifolia L. and Terminalia catappa L. The antimicrobial potential of the two different dyed fabrics was studied against Klebsiella pneumoniae, Escherichia coli, Candida albicans and Aspergillus sp. The dye obtained from leaves of Morinda citrifolia was found to be more effective by exhibiting maximum zone of inhibition as compared to Terminalia catappa. The fabrics impregnated with two natural dyes resulted in the maximum inhibition rate (67 %) against Candida albicans as observed in the silk samples dyed with Morinda citrifolia. The dyed fabrics also showed reasonably good wash fastness; hence have practical potential for adding antibacterial properties along with vibrant colours to textiles of medical and other delicate uses. KEYWARDS: Antimicrobial effectiveness; Natural dye; Morinda citrifolia L.; Terminalia catappa L.; Colour fastness; Silk fabric KUNJA BIHARI SATAPATHY P.G. Department of Botany, Utkal University, Vani vihar, Bhubaneswar-751004 Int J Pharm Bio Sci 2015 Oct; 6(4): (B) 836 843 This article can be downloaded from www.ijpbs.net B 837 INTRODUCTION In the human civilization plants were used not only for the basic needs of life such as food, fiber, fuel, cloths and shelter but also as sources of natural dyes for dying cloths, designing and painting. Dyes are the natural / synthetic compounds used to add a colour to or change the colour of materials. Dyes are capable of being fixed to materials and do not wash out with detergents and water or fade easily on exposure to light. The majority of natural dyes are made from plant parts such as leaves, flowers, berries, roots, bark, rhizomes, tubers, shoots, sap and wood. Natural dyes can provide the essential alternative to the complex world of chemical dyes. These dyes are environmentally sound and can be grown by organic methods. They are inherently carbon neutral. Vibrant colours can be produced from natural dyes. 2 Textiles find immense applications in day to day life and there has been a growing need to develop finishes for textile materials that can offer improved protection to the users from microbes. Many of the natural dyes derived from plant sources were classified as medicinal and possess remarkable antimicrobial activity. Now-a-days, the demand for antibacterial fabric and health care has increased; so, finding a method to get antibacterial textile is a challenge. Fibers, especially natural fibers (wool and cotton), provide basic requirements such as moisture and nutrients for bacterial growth and multiplication. Using synthetic nonbiodegradable chemical compounds for these approaches cause environmental and health concerns. Although natural dyes are known for a long time for dyeing as well as medicinal applications, the structures and protective properties have been recognized only in the recent past. Many of the plants used for dye extraction are classified as medicinal, and some of these have recently been shown to possess remarkable antimicrobial activity. The dyes extracted from natural sources were less competitive and were therefore gradually replaced by synthetic dyes. But now-a-days, extraction and application of natural dyes are becoming more popular owing to the growing awareness of environmental problems coupled with the toxicity associated with synthetic dyes. A variety of antimicrobial textile agents are reported such as organometalics, phenols, quaternary ammonium salts and organo-silicones. Synthetic compounds are more complex and it will take a long time for them to complete their natural cycles and return to nature; thus causing a lot of environmental pollution. Due to the fact that natural dyes can often inhibit the growth of microorganisms traditionally, different plants have been used as natural dyes in textile and carpet industries and it is believed that these dyes are less allergic and more stable than the chemical ones. Natural dyes can produce special aesthetic qualities, which, combined with the ethical significance of a product that is environmentally friendly, gives added value to textile production as craftwork and as an industry. Much has been written about the healing power of colour and their effect on human health and well being through the selection of the wrong or right colours that we surround and cloth ourselves with. In the world today, the position of natural dyes and colorants, ‘natures colours’ are at a crossroad: They will either vanish and with them the ancient knowledge and skill that has advanced with their use over centuries and across civilisations or they will evolve to create a new form of colouration and with this be applied to new environmental/sustainable applications and possibly be recognised for the health/healing aspects they can provide. 12 Currently there was increasing interest into natural dyes and colorants, as interest grows within the Industrialised Nations in natural (green) products and sustainable ways of living. But this could also be in response to the negative impact synthetic dye manufacturing is having on the environment and human health. This is caused during dye synthesis, the release of undesirable/hazardous and toxic chemicals in nature and the effect synthetic dyes can have upon human health, as irritants/sensitizers, synthetic dyes are often the cause of allergic reactions. 13 In the current investigation, the antimicrobial activity of two natural dyeing agents available in Odisha has been examined. The dyed fabrics have been tested for their wash fastness also to ensure the durability of the antimicrobial effect. The purpose of this research is to study the antimicrobial effect of two dye powders, obtained from Morinda Int J Pharm Bio Sci 2015 Oct; 6(4): (B) 836 843 This article can be downloaded from www.ijpbs.net B 838 citrifolia L. and Terminalia catappa L. leaves against 4 microbes. The antimicrobial activity of silk fabric treated with these natural dyes has also been evaluated. MATERIALS AND METHODS Natural dyes were prepared from leaves of two plant species (Morinda citrifolia L. and Terminalia catappa L.) collected from Bhubaneswar, Odisha (India). Morinda citrifolia L. Morinda citrifolia L. belongs to family Rubiaceae, is commonly known as ‘achhu’ (Fig.1). It is a small tree with straight trunk, distributed throughout the greater part of India. Leaves broadly elliptic, bright green, glabrous; flowers white indent; fruits are ovoid, glossy white when ripe. Leaves are used as a healing application for wounds and ulcers. The juice of the leaves is externally applied in gout. The skin health benefits of the ‘achhu’ fruit and leaf have been alluded to by many traditional healers, especially those in the Islands of Tonga, in the South Pacific. It was a common practice for traditional healers of Odisha to treat various forms of skin ailments. Terminalia catappa L. Terminalia catappa L. is a tree, 5-7 m tall, with blackish-brown bark; leaves obovate, coriaceous, glabrous, cordate at base; flowers pale-yellow, fragrant in 6-20 cm long spikes; fruit 3-5.5 x 1.6-2.5 cm, ellipsoidal, brown when ripe (Fig. 2). It belongs to the family Combretaceae. Frequently planted in gardens and avenues. The juice of the leaves is ingested for cough. An infusion of the leaves is used to treat jaundice. Leaves sudorafic, also the paste is applied to rheumatic joints. Bark diuretic and cardiotonic also used in dysentery. The juice of the young leaves is used in South India to prepare an ointment for scabies, leprosy and other cutaneous diseases. Extraction of dye The leaves were collected and completely dried at room temperature (25 C) shade drying and then ground in mixer grinder. The processed leaf powder (500 g) was taken in a soxhlet apparatus and treated with 10% aqueous ethanol (3500 ml) for the extraction of colouring materials by the solvent extraction methods on heating. The whole extract undergoes the process of distillation to obtain the crude dye as a pasty mass. The pasty extract was washed with non-polar solvent such as pet-ether followed by freeze drying to obtain the colouring materials in solid form. The yield of Morinda citrifolia L. and Terminalia catappa L. gives 60 g (12 %) and 50 g (10 %) respectively. Preparation of standard dye solution The semi-solid dye materials were converted into different concentration of standard solution by 10 % aqueous methanol solvent. Thus standard dye solutions were prepared at different concentrations such as 10, 8, 6, 4 and 1%. Dyeing procedure Dyeing was done with or without mordant as well as pre-mordanting and post-mordanting. Morinda citrifolia L. Silk fabric was dipped in prepared mordant solution (20 ml) (10 % alum) at 50 to 60 C for 30-45 minutes. Then the mordanted fabric was air dried for 15 minutes. The dye solution was prepared and the mordanted silk fabric was then dipped in dye bath for 30-45 minutes at 60-70 C. The dyed fabric was left for 15 minute for air oxidation. Finally red colour was achieved. Terminalia catappa L. In the same way silk fabric was dipped in the prepared mordant solution (20 ml) (5% CuSo4) for 30-45 minute at 50-60 C. Then the mordanted fabric was air-dried for 15 minutes. The dye solution was prepared. The mordanted fabric was then dipped in the dye bath for 30-45 minutes at 60-70 C. The dyed fabric was left for 15 minute for oxidation. The brown shade colour was achieved as final result. Test organisms Cultures of following microorganisms were used in the study: Klebsiella pneumoniae ATCC 1705, Escherichia coli ATCC 1053, Candida albicans ATCC 10231, Aspergillus | 2,015 | 0 | null | [
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] | null | null | 130 |
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006c5261566f7c038dc9d24f3bf335d261111b2c | {
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} | https://www.semanticscholar.org/paper/006c5261566f7c038dc9d24f3bf335d261111b2c | Crystalline Ammonium Peroxogermanate as a Waste-Free, Fully Recyclable Versatile Precursor for Germanium Compounds. | High, nearly 100%, yield synthesis of ammonium peroxogermanate (APG), (NH4)6[Ge6(μ-OO)6(μ-O)6(OH)6]·6H2O, is presented, and its crystal structure is determined by single crystal X-ray study. It comprises centrosymmetric hexanuclear peroxogermanate anions [Ge6(μ-OO)6(μ-O)6(OH)6]6- with six μ-oxo- and six μ-peroxo groups forming negatively charged layers. The space between these layers is filled by ammonium cations and water molecules, forming a highly stable structure due to hydrogen bonding. Highly soluble macroporous amorphous germanium oxide (HSGO) is then synthesized by mild treatment of APG. The compound forms highly oversaturated metastable germanium oxide solution with a solubility of 100 g/L, over 20 times higher than the solubility of amorphous germanium oxide. HSGO solution is a versatile reagent that can react with basic and acidic reagents to give a diverse range of salts including, e.g., germanium sulfide, germanium hydrophosphate, and potassium germanate. In the absence of acid or base, the aqueous HSGO solution yields hexagonal germanium oxide under ambient conditions. | Inorganic Chemistry | 2,019 | 10 | {
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} | [
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"name": "O. Lev"
},
{
"authorId": "10799391",
"name": "P. Prikhodchenko"
}
] | https://figshare.com/articles/Crystalline_Ammonium_Peroxogermanate_as_a_Waste-Free_Fully_Recyclable_Versatile_Precursor_for_Germanium_Compounds/7597436/files/14105444.pdf | figshare.com | 131 |
0078a62c5ff9fe8e7eb98195e84279e48734a931 | {
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} | https://www.semanticscholar.org/paper/0078a62c5ff9fe8e7eb98195e84279e48734a931 | Solid-Phase Synthesis and Purification of Protein-DNA Origami Nanostructures. | We present a facile method for the combined synthesis and purification of protein-decorated DNA origami nanostructures (DONs). DONs bearing reductively cleavable biotin groups in addition to ligands for ligation of recombinant proteins are bound to magnetic beads. Protein immobilization is conducted with a large protein excess to achieve high ligation yields. Subsequent to cleavage from the solid support, pure sample solutions are obtained which are suitable for direct AFM analysis of occupation patterns. We demonstrate the method's utility using three different orthogonal ligation methods, the "halo-based oligonucleotide binder" (HOB), a variant of Halo-tag, the "SpyTag/SpyCatcher" (ST/SC) system, and the enzymatic "ybbR tag" coupling. We find surprisingly low efficiency for ST/SC ligation, presumably due to electrostatic repulsion and steric hindrance, whereas the ybbR method, despite its ternary nature, shows good ligation yields. Our method is particularly useful for the development of novel ligation methods and the synthesis of mechanically fragile DONs that present protein patterns for surface-based cell assays. | Chemistry | 2,019 | 9 | {
"status": "BRONZE",
"url": "https://publikationen.bibliothek.kit.edu/1000090878/149924921"
} | [
{
"authorId": "4533177",
"name": "Teresa Burgahn"
},
{
"authorId": "15236618",
"name": "Ruben Garrecht"
},
{
"authorId": "3569009",
"name": "Kersten S. Rabe"
},
{
"authorId": "2772340",
"name": "C. Niemeyer"
}
] | https://publikationen.bibliothek.kit.edu/1000090878/149924921 | publikationen.bibliothek.kit.edu | 132 |
007a0780e9495dbeb0a8b7a69e5d85d4a05d3b5c | {
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} | null | https://www.semanticscholar.org/paper/007a0780e9495dbeb0a8b7a69e5d85d4a05d3b5c | Bioactivity Grafting of Cyclic Peptides: Structure Activity Studies of Grafted Cyclotides and SFTI-1 | Peptides are considered as drugs of the future because of their advantageous features of high specificity and low toxicity. However, the complete therapeutic potential of peptides has not yet been realized because of the in vivo instability displayed by most potential peptides. In this thesis, two naturally derived cyclic peptides, cyclotides and sunflower trypsin inhibitor 1 (SFTI-1), were utilized to impart stability to linear bioactive epitopes and enhance their therapeutic potential in a biological environment. Cyclotides are plant derived mini-proteins with compact folded structures and exceptional stability. Their stability derives from a head-to-tail cyclised backbone coupled with a cystine knot arrangement of three-conserved disulfide bonds. Sunflower typsin inhibitor 1 (SFTI-1) is a stable cyclic peptide containing a single disulfide bond. Taking advantage of these stable cyclic peptide frameworks, novel drug leads to inhibit/stimulate angiogenesis were developed by using the approach of ‘epitope grafting’ in which linear epitopes were grafted onto the cyclic peptide frameworks. Angiogenesis is a physiological condition that is unregulated in the progression of many diseases, including cancers and cardiovascular diseases. Thus the drug leads designed in the current project have potential therapeutic applications to combat cancers and cardiovascular diseases. To fully exploit cyclotides as drug scaffolds, it is imperative to understand their folding. Two main subfamilies, referred to as the Mobius and bracelet cyclotides have been identified and interestingly, they require dramatically different in vitro folding conditions to achieve formation of the conserved cyclic cystine knot motif. To determine the underlying structural elements that influence cyclotide folding, the in vitro folding of a suite of hybrid cyclotides based on combination of the Mobius cyclotide kalata B1 and the bracelet cyclotide cycloviolacin O1 was examined in this thesis. The pathways of folding of the two cyclotide subfamilies were found to be different and primarily dictated by specific residues harboured within inter-cysteine loops 2 and 6. Two changes in these loops, an amino acid substitution in loop 2 and an amino acid addition in loop 6 enabled the folding of cycloviolacin O1 under conditions where folding does not occur in vitro for the native peptide. Thus, the study identified key residues that are not in close proximity in the primary sequence or three-dimensional structure which assist folding in cyclotides. A key intermediate species in the folding pathway was isolated and characterised, and found to contain a native-like hairpin structure that appears to be a nucleation locus early in the folding process. The intermediate does not have native disulfide connectivities, but disulfide shuffling processes ultimately lead to a rearrangement to the native form. Overall these mechanistic findings on the folding of cyclotides are potentially valuable for protein engineering applications that utilize cystine-rich peptides as scaffolds in the design of new drug leads. The current study has also enabled the extention of the grafting studies to the bracelet cyclotide subfamily, which was intractable to grafting prior to this work. Cyclotides are gene encoded macrocyclic proteins and another way to exploit their potential as drug scaffolds, would be to develop combinatorial cyclotide libraries. The most efficient way to generate engineered cyclotides would be via recombinant expression, which currently remains unsuccessful, partly due to lack of understanding of the mechanism of cyclotide backbone cyclization. Understanding how the cyclotide precursor folds may provide clues to how cyliclization occurs. A conserved region known as the N-terminal repeat (NTR) region in the cyclotide precursor has been speculated to play an important role in precursor folding. In this thesis, the function of the NTR in the folding of the cyclotide precursor in vitro was examined via the design of a series of constructs for the precursor protein for the prototypic kalata B1 cyclotide, with incremental additions of the NTR region. Analysis of the constructs by NMR spectroscopy for evidence of secondary structure revealed that the NTR does not assist folding of the cyclotide precursor in vitro. Using diffusion NMR, the unstructured nature of the constructs was localized to the NTR region. In a complementary study, structural analysis of the full length cyclotide precursor was carried out by expressing the precursor gene for kalata B1 in a bacterial expression system. The full-length precursor was found to be unstructured in solution despite approximately half of the precursor comprising the mature domain and NTR, both of which are structured in isolation. The unstructured nature of the cyclotide precursor suggested that a different environment, or indeed interaction of the NTR with a particular enzyme involved in processing, is necessary for it to adopt a well-defined conformation and allow processing to produce the mature circular protein. The information that NTR alone may not assist folding of the cyclotide precursors has provided new impetus to examine the role of other potential folding auxiliaries such as protein disulfide isomerase in cyclotide folding and has indirectly advanced the production of cyclotides via transgenic means. In summary, this thesis has provided a fundamental insight into the folding of cyclotides, both when expressed as part of a precursor protein and in isolation via solid phase chemical synthesis, and has exploited the potential of cyclic peptide scaffolds in drug design applications. | 2,008 | 0 | null | [
{
"authorId": "145126854",
"name": "S. Gunasekera"
}
] | null | null | 133 |
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007a0d3eb4bc3cd010e0771ef2dcfa96fd2ad27f | {
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} | null | https://www.semanticscholar.org/paper/007a0d3eb4bc3cd010e0771ef2dcfa96fd2ad27f | Lanthanide Terminal Hydride Complexes Bearing Two Sterically Demanding C5Me4SiMe3 Ligands. Synthesis, Structure, and Reactivity | The acid−base reaction between lanthanide tris(alkyl) complexes Ln(CH2SiMe3)3(THF)2 and 2 equiv of HC5Me4SiMe3 in THF or hexane at room temperature resulted in the formation of metallocene complexes [(η5:η1-C5Me4SiMe2CH2)Ln(C5Me4SiMe3)(THF)] (Ln = Y (1a), Nd (1b), Sm (1c), Dy (1d), Lu (1e)), in which the metal center is bonded to one C5Me4SiMe3 ligand in a normal η5-form and to the other in a μ-η5:η1-chelate fashion through metalation of a methyl group of the SiMe3 substituent. Hydrogenolysis of 1a−e in toluene at room temperature afforded the corresponding metallocene terminal hydride complexes [(C5Me4SiMe3)2LnH(THF)] (Ln = Y (2a), Nd (2b), Sm (2c), Dy (2d), Lu (2e)). Complexes 2a,d,e were isolated and structurally characterized by X-ray analysis, whereas 2b,c, which possess larger metal ions, existed only in solution in the presence of H2. The reaction of the yttrium hydride complex 2a with 1 equiv of p-methoxyphenylisocyanide yielded the ethylene diamido complex [(C5Me4SiMe3)2YN(Ar)(CH═)]2 (Ar = C6H4-O... | 2,009 | 52 | null | [
{
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"name": "Yasumasa Takenaka"
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{
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"name": "Z. Hou"
}
] | null | null | 134 |
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007ad3a79ae1633fd0f51ad51cc15c8abfe1ce73 | {
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"url": "https://link.springer.com/bookseries/11156"
} | https://www.semanticscholar.org/paper/007ad3a79ae1633fd0f51ad51cc15c8abfe1ce73 | Analytical Calculation of the Relations of Profile w/h and s/h of a Micro-coplanar Stripline with a Dielectric and a Ground Plan for the Static Case | null | Advances in Intelligent Systems and Computing | 2,019 | 0 | null | [
{
"authorId": "2127710583",
"name": "Nayade Vanessa Domenech Polo"
},
{
"authorId": "2127710225",
"name": "Wilmer Fabian Albarracin Guarochico"
},
{
"authorId": "2127693389",
"name": "Yoandry Rivero Padron"
}
] | null | null | 135 |
007e33640a45dd6fef5707f9ce7734f1f8fdf1fc | {
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} | null | https://www.semanticscholar.org/paper/007e33640a45dd6fef5707f9ce7734f1f8fdf1fc | Catalytic oxidation of volatile organic compounds over cerium-copper oxide catalysts | Over 300 chemicals are designed as volatile organic compounds (VOCs) by the U.S. Environmental Protection Agency and most of them are highly toxic/carcinogenic substances that contribute to photochemical smog, global warming and so on. Therefore, VOCs are carefully regulated and different technologies have been developed to control their release to the atmosphere [1]. Catalytic oxidation is one of the most widely used techniques to control VOCs emissions at relatively low temperatures: it is less fuel intensive compared to thermal oxidation and it is highly versatile with the possibility to treat waste streams with different VOC concentrations and effluent flow rates [2]. It is generally accepted that the oxidation of VOCs over transition metal oxides, such as CuOCeO2 systems, occurs according to a Mars-van Krevelen type mechanism and proceed through lattice oxygen (nucleophilic attack) of the solid catalysts [3]. Therefore, the molecular oxygen is only required to reoxidize the reduced catalyst surface [4]. The redox activity of CuO-CeO2 catalysts is created by the ability to reduce and reoxidize both CuO and CeO2, which is enhanced by a strong interaction between these phases. Indeed, CuO-CeO2 is a more efficient catalyst for VOC total oxidation than the corresponding single metal oxides. This means that a synergistic effect between CuO and CeO2 can be observed using a MvK model to describe the kinetic data. In this work, several CuO-CeO2 catalysts with different Cu/Ce contents (denoted hereafter as CuxCe1-x where x indicates the Cu/Cu+Ce atomic ratio) have been synthesized by the solution combustion synthesis (SCS) and their catalytic activity has been examined in the total oxidation of ethylene as probe molecule. The prepared catalysts have been characterized by complementary techniques, including powder XRD, FE-SEM, N2 physisorption at -196 °C, H2TPR, XPS and IR spectroscopy. The CuxCe1-x catalysts have specific surface areas and total pore volumes in the range of 34-73 m 2 g -1 and 0.04-0.25 cm 3 g -1 , respectively. The largest surface area and pore volume values are observed for the Cu0.15Ce0.85 catalyst, whereas further increase of Cu content leads to worse values of textural properties, in agreement with previous studies. The specific surface areas for pure CeO2 and CuO are 69 m 2 XXXVIII Meeting of the Italian Section of the Combustion Institute g -1 and 4 m 2 g -1 , respectively. XRD patterns have shown that a cubic fluorite lattice structure of CeO2 (Fm3m symmetry) appear with all samples, as well as reflections of the CuO phase occur in the addition to those of ceria, as the increase of copper leads to the formation of bulk CuO particles. Figure 1 shows a representative FESEM image of the CuxCe1-x catalysts, in which is possible to observe relatively uniform agglomerates of particles (diameter of ca. 100-150 nm). Figure 1. FE-SEM image of the Cu0.6Ce0.4 catalyst. The oxidation activity of CuxCe1-x catalysts has been evaluated in the total oxidation of ethylene with a gas hourly space velocity of 19100 h −1 and a W/F value of 0.03 g h l −1 . The conversion of ethylene to CO2 as function of temperature is shown in Figure 2. All the prepared catalysts display positive ethylene conversion trends for an increasing reaction temperature. However, different conversion values can be observed. The most active catalyst is Cu0.6Ce0.4 and complete oxidation of ethylene to CO2 occurs at ca. 450 °C. Further increase of Cu content diminishes the catalytic activity. The lowest ethylene conversion is achieved for pure CeO2. As a whole, CuxCe1-x catalysts show better activities compared to pure CuO and CeO2 likely due to their easier reducibility and redox properties, as revealed by H2-TPR and XPS analysis. Therefore, the most active powder catalyst (Cu0.6Ce0.4) was then deposited on a cordierite-type monolith through a novel direct synthesis (Figure 3) and tested for the total oxidation of the VOCs. The Cu0.6Ce0.4-based monolith exhibited high activity towards the total oxidation of VOCs, which is comparable to that obtained with powdered Cu0.6Ce0.4. Since industrial emissions usually contain mixtures of VOCs, studies on the catalytic activity of a single probe molecule of VOC only partially represent the possible catalyst applications. Therefore, further investigations are currently under investigations for mixture of VOC (namely, ethylene, propylene and toluene). XXXVIII Meeting of the Italian Section of the Combustion Institute 200 300 400 500 600 700 0 20 40 60 80 100 E th y le n e c o n v e rs io n (% ) Temperature (°C) CeO 2 | 2,015 | 0 | null | [
{
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] | null | null | 136 |
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} | https://www.semanticscholar.org/paper/0080465453556d19a24109113f96fb5bcf53311c | A ruthenium-based metallostar: synthesis, sensitized luminescence and (1)H relaxivity. | Ru-based metallostars Na(4){Ru[Ln(2)bpy-DTTA(2)(H(2)O)(4)](3)} (Ln = Y, Gd, and Eu) have been self-assembled in aqueous solution and their relaxivity and optical properties unravelled. The synthesis and the purification of the new, highly stable heptametallic entities have been optimized for the diamagnetic Y(3+) complex and followed by (1)H NMR. The europium(iii) ruthenium-based metallostar {Ru[Eu(2)bpy-DTTA(2)(H(2)O)(4)](3)}(4-) displays sensitized (5)D(0)-->(7)F(J) luminescence upon excitation of the tris(2,2'-bipyridyl)ruthenium(ii) unit in the ultraviolet around 293 nm, as well as in the visible around 450 nm ((1)MLCT state). NMRD profiles at two temperatures (25 degrees C and 37 degrees C) were performed on {Ru[Gd(2)bpy-DTTA(2)(H(2)O)(4)](3)}(4-). NMRD profiles of the ruthenium-based {Ru[Gd(2)bpy-DTTA(2)(H(2)O)(4)](3)}(4-) and the iron-based {Fe[Gd(2)bpy-DTTA(2)(H(2)O)(4)](3)}(4-) metallostars were fitted with SBM theory coupled to the model-free Lipary-Szabo method for internal motion as well as with the modified Florence approach. Comparison of both fitting methods shows that the Florence approach is able to fit NMRD profiles up to 100 MHz, fails however at higher frequencies because it does not account for internal motion. Overall, the results detailed point to the heptametallic self-assembled edifices being potential relaxivity and luminescence bimodal bioprobes for use in animal models. | Dalton Transactions | 2,009 | 42 | null | [
{
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"authorId": "153012067",
"name": "A. Aebischer"
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"name": "J. Bünzli"
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{
"authorId": "2018137",
"name": "L. Helm"
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] | null | null | 137 |
00810cd4118e3e6bdac2f8e38e2349cb59934fab | {
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} | null | https://www.semanticscholar.org/paper/00810cd4118e3e6bdac2f8e38e2349cb59934fab | Preparation of High Charge Storage Capacity PEDOT/Functionalized Mwcnts Hybrid Nanocomposite for Neural Electrode Applications | There is an ever growing demand for the development of high charge storage capacity, biocompatible microelectrodes, which are essential for neural recording and stimulation applications. The challenge here is to increase the charge storage capacity. Higher charge density would enable to pump in higher charge at the electrode/biological element interface even in with a smaller area electrode. However, there is a tradeoff between electrode dimension and interface impedance. A decrease in the electrode dimension results in low capacitance and high impedance which is a major drawback for stimulation because higher signal amplitudes are required for efficiently stimulating the cells. In order to overcome this bottleneck, it is imperative to develop materials having higher active area for the same geometric area. This not only reduces the interface impedance but also increases the specific capacitance. In developing these materials, biocompatibility and long term stability considerations must be taken into consideration.
Biocompatible conducting polymers are good candidates for these applications and are being utilized as electrode materials in neuro prosthesis research for the past two decades. Yet the quest of high charge density electrode is still unmet. Among them, PEDOT (Poly Ethylene Dioxy Thiophene) is considered to be one of the promising conducting polymers due to its excellent electronic and ionic conductivity which cater low impedance and high specific capacitance, ease of fabrication by electro chemical polymerization along with excellent biocompatibility and bio stability. But PEDOT suffers from low cycling stability due to its low mechanical strength leading to decrease in pseudo capacitance and conductivity. Choosing the right dopant in PEDOT could potentially overcome these issues.
In this work, we have synthesized different hybrid nanocomposites of PEDOT by doping different types carbon based 2D nanomaterials. The syntheses of these nanocomposites were carried out using electro polymerization. The electrode deposition was carried out using Chrono Amperometry, a widely used Potentiostatic technique. The idea behind using these 2D nanomaterials is well explored owing to the inherent advantages of these materials such as extraordinary mechanical strength, electrical conductivity and high chemical stability. Furthermore, the high surface to volume ratio results in higher surface charge, thereby resulting in a higher storage capacity. The focus of this endeavor is to study the charge storage capacity of the synthesized hybrid nanocomposites.
The dopants that were used to synthesize the nano composites were Graphene nano platelets, Graphene Oxide, Multiwalled Carbon Nanotubes (MWCNTs) and functionalized MWCNTs. Similar conditions were adapted for electro polymerization. All the experiments were carried out at a scan rate of 100 mV/s using CH Instruments electro chemical setup shown in Fig.1. These include finite pulse potential amplitude of 1V and 120s pulse duration. Amongst all the materials, functionalized MWCNTs demonstrated the highest charge storage capacity as can be inferred by the cyclic voltammograms shown in Fig. 2(a). Functionalized CNTs not only disperse well in the precursor solution but also get embedded in a greater quantity in PEDOT matrix owing to their inherent negative charge.
After identifying the right choice of dopant, the next step is to optimize the electro polymerization conditions so as to enhance the charge storage capacity to the best possible value. Cyclic voltammograms (CV) of PEDOT/Functionalized MWCNTs (PEDOT/FCNTs) as shown in Fig. 2(b) reveals that the area of the CV curve is highest for a loading percentage (wt/vol) of 1 mg/ml compared to other loading percentages. We observed that beyond 1 mg/ml, the excess concentration of MWCNTs is impeding the electro polymerization and is not resulting in a good film. The loading was fixed to 1 mg/ml for subsequent experiments. The next parameter that was optimized is the potential of electro polymerization with the duration of electro polymerization being 800s. As can be observed from Fig. 2(c), the suitable potential is 1 V. Voltages beyond this show a reduced charge storage and may be attributed to over oxidation during polymerization. Similarly, Fig. 2(d) reveals that area of the CV curve has attained maximum at pulse duration of 800s by keeping the amplitude as constant at 1V. Fig. 3 depicts the magnitude plot of electrode interface impedance for the PEDOT/CNT-COOH nanocomposite deposited at 1V with pulse duration of 800s in the frequency range of 0.1Hz to 1MHz. Hence, the best possible charge storage capacity and lowest interface impedance is obtained for a ratio of 1mg/ml (wt/vol) with electro polymerization amplitude of 1V and pulse duration 800s. Further morphological studies would be carried out in due of course of time to gain a deeper understanding in the synthesis of hybrid nanocomposite of PEDOT/FCNTs. | 2,017 | 3 | null | [
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} | null | https://www.semanticscholar.org/paper/0087b7405388777ccf75228bd5a236a39a46841a | Silicide Nanowires from Coordination Compound Precursors | In the last two decades there has been a great interest in the synthesis and characterization of one-dimensional materials. A variety of inorganic materials have been prepared in the form of nanowires and nanobelts with a diameter of a few nanometer and lengths going up to several hundreds of microns (Xia et al., 2003). The two main techniques used for nanowire growth are vapor-assisted (Wagner, 1964) and solution-based growth (Stejny, 1981; Stejny, 1979; Kruyt & Arkel, 1923; Gates et al., 2002; Mayers & Xia, 2002; Messer et al., 2000; Song et al., 2001) processes. Nanowires, nanorods and nanobelts constitute an important class of 1D nanostructures, which provide models to study the relationship between electrical transport, optical, magnetic and combined properties such as electro-optic and magneto-electronic properties with dimensionality and size confinement. In recent decades strong interest has been drawn to explore silicides (Murarka, 1983; Miglio & d’Heurle, 2000), which are chemical compounds of silicon with different metals. Considerable amount of studies are carried out on transition metal silicides such as CoSi2, NiSi, MnSi, CrSi2, FeSi (Maex & Rossum, 1995). The magnetic properties of MnSi and FeSi are studied extensively. MnSi has a helical spin structure at low fields below 29 K and it is paramagnetic above that temperature (Ishikawa et al., 1976; Belitz, 1999). CrSi and NiSi are either weakly paramagnetic or diamagnetic. The transition-metal monosilicides such as MnSi, CoSi and FeSi are a group of highly correlated electron materials (Aeppli & DiTusa, 1999; Riseborough, 2000). In the case of MnSi, application of external magnetic fields results in field-induced phase transitions from the helimagnetic phase to a conical spin structure at low fields and then to a ferromagnetic state at higher magnetic fields (Ishikawa et al., 1976; Belitz, 1999). The temperature dependence of high field magnetization of field-induced ferromagnetic states of MnSi shows signatures indicating the role of both spin wave excitations and stoner band excitations related to itinerant electron ferromagnetism (Aeppli & DiTusa, 1999). In another manganese-based silicide, Mn5Si3, the magnetic structure has been studied for many years (Lander et al., 1967; Brown & Forsyth, 1995; Silva et al., 2002). Mn5Si3 shows two different antiferromagnetic configurations with a low temperature highly non-collinear phase (Lander et al., 1967; Brown & Forsyth, 1995; Silva et al., 2002). It was previously reported that antiferromagnetic Mn5Si3 can be driven into a ferromagnetic or ferrimagnetic state by insertion of carbon into the voids of Mn octahedra of the hexagonal structure (Senateur, 1967). Thin films of Mn5Si3Cx with x = 0.8 have a Curie temperature TC = 350 K (Surgers, 2003) well above room temperature. FeSi is a Kondo insulator (Aeppli & | 2,011 | 1 | null | [
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"authorId": "144680529",
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] | null | null | 139 |
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008909ebf9f5ff7d52dadd489935b621c2455a30 | {
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} | null | https://www.semanticscholar.org/paper/008909ebf9f5ff7d52dadd489935b621c2455a30 | Towards sequence-selective DNA recognition withdesigned major groove binders | This thesis is mainly focused on the design, synthesis and DNA binding studies of aminobenzyl and guanidinium calix[4]arene dimers. The work consists of two parts.
The first part of my Ph.D. work was focused on the synthesis and DNA binding studies of Dimer A and Dimer B. In order to broaden the scope of the investigation, the corresponding monomeric calixarenes (Monomer A and Monomer B) were also synthesized. Compared with anilino-calix[4]arenas (R. Zadmard, T. Schrader, Angew. Chem. Int. Ed. 2006, 45, 2703 –2706), these dimers and monomers are water-soluble, and bind to DNA with much higher affinity (binding constants: 1000000–100000000 M-1 in 2 mM Hepes buffer with 150 mM NaCl).
When investigating the properties of new DNA binding molecules, one initial goal is to establish their mode of binding to DNA. Because direct structure information from a crystal or NMR structure was not yet available in my work, several other biophysical experiments have been designed and performed between calixarenes and different nucleic acids with varying base composition and conformation. The following results from established binding assays strongly support a major groove binding mode:
(1). The DAPI displacement assay indicates that the calixarene dimers and DAPI can simultaneously bind to poly (dAdT) – poly (dAdT). Because DAPI occupies the minor groove, the dimeric calixarenes should reside in the major groove.
(2). Ethidium bromide displacement assays, fluorescence titrations, and circular dichroism measurements indicate that calixarene dimers strongly prefer nucleic acids with a wide, shallow or even major groove; while low affinities are observed for nucleic acids with a narrow, deep or rugged major groove, which must be widened before complexation occurs. This characteristic also implies that the accessible area for our ligands is on the major groove side, contrary to the well-known slim oligoamide binders, which target the minor groove.
In line with these observations, it was noticed that changes in shape and width of the minor groove had no influence on the ligands’ affinities.
Dimer A
Dimer B
Monomer A
Monomer B
Unfortunately, Dimer A and Dimer B showed similar affinities for different DNA duplexes. Therefore, we planed to replace the simple alkyl bridge between both calixarenes by a fragment which should be able to bind specific sequences of DNA in the promoter region of each gene. Heterocyclic oligoamides were found out. They consist of N-methylpyrrole, 3-hydroxypyrrole and N-methyl imidazole amino acid building blocks (P. B. Dervan, Bioorganic & Medicinal Chemistry 2001, 9, 2215–2235.).
In the second part of my Ph.D. work, a calixarene dimer with a triimidazole bridge (Dimer C) was synthesized.
Dimer C
Because in minor grooves, N-methylimidazoles of polyamides could recognize the positive electrostatic potential of amino groups of guanine bases via hydrogen bonds, it was assumed that Dimer C, which contained a triimidazole bridge, could prefer a major groove with large positive potentials. Moreover, because the triimidazole bridge is slim, it was also assumed that Dimer C should prefer a narrow major groove, which could offer the appropriate shape for the bridge’s recognition. In view of the above-mentioned assumptions, we found that the major groove of poly dG – poly dC fulfilled both requirements. Therefore, it was predicted that Dimer C should show the high affinity for poly dG – poly dC.
Ethidium bromide displacement assays, fluorescence titrations, and circular dichroism measurements imply that Dimer C is a major groove binder. Furthermore, as we expected, these experiments indicate that Dimer C showed stronger preference for this specific DNA duplex: poly dG – poly dC.
It was also observed that Dimer C frequently showed reduced affinity to other DNA duplexes. Probably, the decrease in affinity is related to their wider major grooves, in which the slim triimidazole bridge will not produce extensive close van der Waals contacts, and the whole ligand itself shows orientational disorder. Another explanation is the unfavorable electrostatic potentials, because these DNA duplexes have more neutral areas in major grooves than does poly dG – poly dC.
Herein, we present a proposed mechanism of DNA binding by Dimer C: the cationic moieties on the upper rim of the calixarenes form hydrogen bonds with nucleobases as well as phosphate groups of the nucleic acid, the butoxy tail is toward the free solution, and the triimidazole bridge binds along the major groove and recognizes the amino groups of nucleobases. | 2,011 | 0 | null | [
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} | null | https://www.semanticscholar.org/paper/008a12bc5e57588c05706564f294167877893626 | Heterobimetallic 3d-4f (Zn/La) {6,6′-Dimethoxy-2,2′-[naphthalene-2,3-diylbis(nitrilomethylidyne)]diphenolato}-pyridylzinc(II)-tris(nitrato-O,O′)lanthanum(III) Monohydrate | Herein, we report the synthesis and structural characterization of a complex with extended aromaticity based on a naphthalene-bridged Schiff base complex with two metal binding pockets. In a first step, the Zn(II) complex (ZnL), {6,6′-dimethoxy-2,2′-[naphthalene-2,3-diylbis(nitrilomethylidyne)]diphenolato}a-pyridylzinc(II) was isolated followed by refluxing with lanthanum(III) nitrate to produce the heterobimetallic complex {ZnL[La(NO3)3·H2O]}. Crystals suitable for X-ray diffraction were grown by vapor diffusion of THF into a pyridine solution of the complex. The monoclinic unit cell (P21/n) is commensurately modulated along the c-axis direction and contains four crystallographically independent molecules with pseudo-translational symmetry being broken by slightly differing orientations of included pyridine and THF solvate molecules. The zinc atom adopts a distorted square pyramidal geometry and sits slightly above the ligand plane, whereas the lanthanum atom adopts an all-face capped trigonal prismatic geometry and sits below the ligand plane. Structural characterization of this diamagnetic complex lays the groundwork for applying these synthetic techniques to the near-infrared emitting lanthanides for practical application. | 2,017 | 1 | {
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} | https://www.semanticscholar.org/paper/008dd59a159cee394013ebf99f818136cee68d56 | Hierarchical chiral expression from the nano- to mesoscale in synthetic supramolecular helical fibers of a nonamphiphilic C3-symmetrical π-functional molecule. | The controlled preparation of chiral structures is a contemporary challenge for supramolecular science because of the interesting properties that can arise from the resulting materials, and here we show that a synthetic nonamphiphilic C(3) compound containing π-functional tetrathiafulvalene units can form this kind of object. We describe the synthesis, characterization, and self-assembly properties in solution and in the solid state of the enantiopure materials. Circular dichroism (CD) measurements show optical activity resulting from the presence of twisted stacks of preferential helicity and also reveal the critical importance of fiber nucleation in their formation. Molecular mechanics (MM) and molecular dynamics (MD) simulations combined with CD theoretical calculations demonstrate that the (S) enantiomer provides the (M) helix, which is more stable than the (P) helix for this enantiomer. This relationship is for the first time established in this family of C(3) symmetric compounds. In addition, we show that introduction of the "wrong" enantiomer in a stack decreases the helical reversal barrier in a nonlinear manner, which very probably accounts for the absence of a "majority rules" effect. Mesoscopic chiral fibers, which show inverted helicity, i.e. (P) for the (S) enantiomer and (M) for the (R) one, have been obtained upon reprecipitation from dioxane and analyzed by optical and electronic microscopy. The fibers obtained with the racemic mixture present, as a remarkable feature, opposite homochiral domains within the same fiber, separated by points of helical reversal. Their formation can be explained through an "oscillating" crystallization mechanism. Although C(3) symmetric disk-shaped molecules containing a central benzene core substituted in the 1,3,5 positions with 3,3'-diamido-2,2'-bipyridine based wedges have shown peculiar self-assembly properties for amphiphilic derivatives, the present result shows the benefits of reducing the nonfunctional part of the molecule, in our case with short chiral isopentyl chains. The research reported herein represents an important step toward the preparation of functional mesostructures with controlled helical architectures. | Journal of the American Chemical Society | 2,011 | 135 | null | [
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00904c7ed1a5254d2842e4df2168b68c935b67c5 | {
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} | null | https://www.semanticscholar.org/paper/00904c7ed1a5254d2842e4df2168b68c935b67c5 | Supercapacitors based on graphene/pseudocapacitive materials | In this work composites of graphene and SnO 2 were successfully prepared by single step simultaneous synthesis of SnO 2 and reduction of graphene oxide (GO). Three different compositions of precursor solution resulted with different composite materials containing graphene and SnO 2 . The reaction was carried out by using microwave-assisted hydrothermal synthesis. Scanning electron microscopy (SEM) and Energy-dispersive X-ray spectroscopy (EDX) gave insight into morphology and composition of the obtained materials. Good capacitive/pseudocapacitive properties of the obtained material suitable for supercapacitor application were registered by using cyclic voltammetry from where specific capacitance values up to 93 F g -1 were determined. | 2,017 | 2 | {
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] | http://www.doiserbia.nb.rs/ft.aspx?id=0352-51391700027S | www.doiserbia.nb.rs | 143 |
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} | https://www.semanticscholar.org/paper/00968c0f4b1bb35e00771d75685a57b832f0a206 | Tunable Robust pacs-MOFs: a Platform for Systematic Enhancement of the C2H2 Uptake and C2H2/C2H4 Separation Performance. | As a modulatable class of porous crystalline materials, metal-organic frameworks (MOFs) have gained intensive research attention in the domain of gas storage and separation. In this study, we report on the synthesis and gas adsorption properties of two robust MOFs with the general formula [Co3(μ3-OH)(cpt)3Co3(μ3-OH)(L)3(H2O)9](NO3)4(guests) n [L = 3-amino-1,2,4-triazole (1) and 3,5-diamino-1,2,4-triazole (2); Hcpt = 4-(4-carboxyphenyl)-1,2,4-triazole], which show the same pacs topology. Both MOFs are isostructural to each other and show MIL-88-type frameworks whose pore spaces are partitioned by different functionlized trinuclear 1,2,4-triazolate-based clusters. The similar framework components with different amounts of functional groups make them an ideal platform to permit a systematic gas sorption/separation study to evaluate the effects of distinctive parameters on the C2H2 uptake and separation performance. Because of the presence of additional amido groups, the MOF 2 equipped with a datz-based cluster (Hdatz = 3,5-diamino-1,2,4-triazole) shows a much improved C2H2 uptake capacity and separation performance over that of the MOF 1 equipped with atz-based clusters (Hatz = 3-amino-1,2,4-triazole), although the surface area of the MOF 1 is almost twice than that of the MOF 2. Moreover, the high density of open metal sites, abundant free amido groups, and charged framework give the MOF 2 an excellent C2H2 separation performance, with ideal adsorbed solution theory selectivity values reaching up to 11.5 and 13 for C2H2/C2H4 (1:99) and C2H2/CO2 (50:50) at 298 K and 1 bar, showing potential for use in natural gas purification. | Inorganic Chemistry | 2,018 | 32 | null | [
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} | https://www.semanticscholar.org/paper/00970ff083a841e9a67ef06a85e98209df6bc3b5 | Zinc Oxide Nanostructures and High Electron Mobility Nanocomposite Thin Film Transistors | This paper reports on the synthesis of zinc oxide (ZnO) nanostructures and examines the performance of nanocomposite thin-film transistors (TFTs) fabricated using ZnO dispersed in both n- and p-type polymer host matrices. The ZnO nanostructures considered here comprise nanowires and tetrapods and were synthesized using vapor phase deposition techniques involving the carbothermal reduction of solid-phase zinc-containing compounds. Measurement results of nanocomposite TFTs based on dispersion of ZnO nanorods in an n-type organic semiconductor ([6, 6]-phenyl-C61-butyric acid methyl ester) show electron field-effect mobilities in the range 0.3-0.6 cm2 V-1s-1, representing an approximate enhancement by as much as a factor of 40 from the pristine state. The on/off current ratio of the nanocomposite TFTs approach 106 at saturation with off-currents on the order of 10 pA. The results presented here, although preliminary, show a highly promising enhancement for realization of high-performance solution-processable n-type organic TFTs. | IEEE Transactions on Electron Devices | 2,008 | 56 | null | [
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} | https://www.semanticscholar.org/paper/0098b46ddc4f32c2b0e67a3abc42a6fabcd29c2f | Synthesis, structures, and photochemistry of tricarbonyl metal polyoxoanion complexes, [X2W20O70{M(CO)3}2]12– (X = Sb, Bi and M = Re, Mn). | A new series of complexes containing two electron donating groups, {M(CO)(3)}(+) ions, M = Re or Mn, on one polytungstate electron acceptor group have been prepared and characterized. These complexes containing two electron donating groups, {M(CO)(3)}(+) ions, M = Re or Mn, on one polytungstate electron acceptor group have been prepared and characterized. These two-component polyoxometalate (POM) compounds have been made by reaction of solvated {M(CO)(3)}(+) ions (M = Re or Mn) with [X(2)W(22)O(74)(OH)(2)](12-) (X = Sb or Bi) POM multidentate ligands in aqueous solution. These syntheses reveal that the fac-{WO(OH)(2)}(2+) groups in the terminal positions of these two POM ligands are easily replaced by the topologically equivalent units fac-{M(CO)(3)}(+). Four compounds, [X(2)W(20)O(70){M(CO)(3)}(2)](12-) (1a: X = Sb, M = Re; 1b: X = Bi, M = Re; 2a: X = Sb, M = Mn; 2b: X = Bi, M = Mn) have been isolated and characterized of X-ray crystallography, spectroscopic, and computational methods. The charge transfer dynamics, investigated by femtosecond transient absorption (TA) spectroscopy of 1a and 1b combined with the density functional theory (DFT) calculations indicate that both complexes exhibit metal-to-polyoxometalate charge-transfer (MPCT) from the Re centers to the POM ligands, while MPCT from the Mn centers to the POM ligands in 2a and 2b leads to decomposition of starting compounds. The studies suggest a general synthetic route to a potentially very large class of POM-based hybrid compounds. | Inorganic Chemistry | 2,013 | 47 | null | [
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} | null | https://www.semanticscholar.org/paper/0098ef89e83d22485ee11a02600912c5dcb4a876 | Cummins, Brian M. and Li, Mingchien and Locke, Andrea K. and Birch, David J.S. and Vigh, Gyula and Cote, Gerard L. (2015) Overcoming the aggregation problem : a new type of fluorescent ligand for ConA-based | Competitive binding assays based on the lectin Concanavalin A (ConA) have displayed significant potential to serve in continuous glucose monitoring applications. However, to date, this type of fluorescent, affinity-based assay has yet to show the stable, glucose predictive capabilities that are required for such an application. This instability has been associated with the extensive crosslinking between traditionally-used fluorescent ligands (presenting multiple low-affinity moieties) and ConA (presenting multiple binding sites) in free solution. The work herein introduces the design and synthesis of a new type of fluorescent ligand that can avoid this aggregation and allow the assay to be sensitive across the physiologically relevant glucose concentration range. This fluorescent ligand (APTS-MT) presents a single high-;aaキミキデ┞ デヴキマ;ミミラゲW マラキWデ┞ デエ;デ キゲ ヴWIラェミキ┣WS H┞ CラミAげゲ a┌ノノ HキミSキミェ ゲキデW and a fluorophore that can effectively track デエW ノキェ;ミSげゲ equilibrium binding via fluorescent anisotropy. This is confirmed by comparing its measured fluorescent lifetime to experimentally-determined rotational correlation lifetimes of the free and bound populations. Using an assay comprised of 200 nM APTS-MT and 1 μM ConA, the fluorescence anisotropy capably tracks the concentration of monosaccharides that are known to bキミS デラ CラミAげゲ ヮヴキマ;ヴ┞ HキミSキミェ ゲキデWが ;ミS デエW ;ゲゲ;┞ Sキゲヮノ;┞ゲ ; MA‘D ラa ヶくヵХ ;Iヴラゲゲ physiologically relevant glucose concentrations. Ultimately, this rationally-designed fluorescent ligand can facilitate the realization of the full potential of ConA-based glucose sensing assays and provide the basis for a new set of competing ligands to be paired with ConA. | 2,018 | 0 | null | [
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0099b20694421d8eb76eca8a6e31ff564b08806a | {
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} | null | https://www.semanticscholar.org/paper/0099b20694421d8eb76eca8a6e31ff564b08806a | Synthesis , Growth and Characterization of Bis p-Nitrophenol Magnesium Chloride ( BPNPMC ) Single Crystal for NLO Applications | Good quality single crystals of a new semi organic Bis pNitrophenol Magnesium chloride (BPNPMC) were grown from solution by slow evaporation technique at room temperature. The grown crystal have been confirmed by single crystal X-Ray Diffraction Method. UV -Vis transmission and absorption studies reveals that the grown crystal were optically transparent through the visible range. The vibrational frequencies of various functional groups in the crystals have been derived from Fourier transform infrared spectrum (FTIR). In the dielectric studies, the dielectric constant and dielectric loss of the crystal were measured as a function of frequency and various temperatures. The optical studies indicate the sample, optical transparency window is quite wide, making it suitable for NLO applications. Micro hardness studies were carried out to confirm the mechanical behavior of the crystal. The second harmonic generation (SHG) test has been confirmed by the Kurtz powder test and its efficiency 1.73 times higher than that of KDP. © 2016 Elixir All rights reserved. Elixir Crystal Research 98 (2016) 42689-42692 Crystal Research Available online at www.elixirpublishers.com (Elixir International Journal) V.Revathi Ambika et al./ Elixir Crystal Research 98 (2016) 42689-42692 42690 The solution was taken in vessels and closed with covers and kept in a dust-free atmosphere. The crystals were harvested within 10 weeks and they attained an optimal size and shape. The grown crystals are shown in Fig.1. Figure 1. Photograph of Grown BPNPMC Crystal. 3. Results and discussion 3.1. Single crystal X-ray diffraction The grown crystals were subjected to single crystal X-ray diffraction analysis using ENRAF NONIUS CAD4 X-ray diffractometer to determine the cell parameters and it reveals that the MPNP crystal crystallizes in monoclinic system. The lattice parameters were found to be a = 3.80A ̊, b = 11.21A ̊, c = 14.86A ̊, β = 92.92 o and V = 632A 3 . 3.2. FTIR analysis FTIR spectroscopy finds application in determining the size of the coordination, the nature of organic ligand bonding as well as in the elucidation of structures of coordination compounds. The FTIR spectrum was recorded in the spectral range 400-4000 cm -1 using Perkin-Elemer Lambla-35 FTIR spectrometer, where the B4NPMC crystalline sample was in Pellet form in KBr phase. The vibration observed between 846 and 694 cm -1 are usually associated with the presence of benzene rings. The peak between 755 and 846 cm -1 shows the meta position of the substituted. The minor peaks appearing in wavenumber region 755 cm -1 corresponds to the out of plane N-H wagging. The peak at 846 cm -1 is assigned to C-N vibration. The peaks at 1340cm -1 are due to the vibration of NO2 stretching modes. As either the N-H stretching modes or NO2 stretching modes are not much broad, their interaction with the neighbouring molecule is recognized to be weak bonds. The -OH peak is broadened owing to hydrogen bonding present in phenols. These confirm that the compound consists a phenol group. If a nitro group is attached to an aromatic ring, the N-O stretching bands shift to down to slightly lower wave numbers from 1550-1475 cm -1 and 13601290 cm -1 . Hence these peaks observed at the region of 1493cm -1 and 1340cm -1 as symmetric and asymmetric stretching vibrations respectively were assigned to N=O group [16]. Compounds that do not have a C=C bond show C–H stretches only below 3000cm -1 . But the C–H stretch observed at 3087cm -1 shows the presence of aromatic ring. The important infrared modes for nitro compounds (-C-NO2) were usually observed in the finger print region between 13001100cm -1 .The peak at 1187cm -1 confirms the presence of CNO2 bonding. The peak at 3087 cm -1 is due to aromatic C-H vibration. The absorption peak at2822 cm -1 is due to H-C=O stretching and the aldehydic C-H stretching absorption peak at 2701 cm -1 is to confirm the presence of aldehydic group(silverstein1991). The aromatic skeletal ring is observed at 1599cm -1 . Peak at 1286 cm -1 is due to N-H bending and CN stretching vibrations [17]. The peak at 3363 cm -1 corresponds to NH2 stretching. The peak at 3596 cm -1 corresponds to OH stretching due hydrogen bonding. 694 cm -1 which are assigned to C=C bending. Table 1. Peak assignments of BPNPMC. Wave Number cm Assignments 3596 3363 3087 1599 C=C 1493]N=O 1340]N=O 755 694 OH Stretching NH2Stretching Aromatic CH Aromatic ring C=C stretch N=O Asymmetric stretch N=O Asymmetric stretch Out of plane N-H wagging C=C bending Figure 2. FTIR spectrum of BPNPMC of single crystal. 3.3. UV-VIS Spectral analysis. Good optical transmittance and lower cut off wavelength are very important properties for NLO crystals. The spectrum has been recorded in the wavelength range from 190 nm to 900nm and is shown in the fig.3. The lower cut off wavelength is around 300nm. The Π electron dislocation is responsible for absorption in near UV region (Ushasree et al, 1999) .Thus the grown crystal has got good transmission in UV as well as invisible region 300nm900nm. The wide range of transparency of grown crystal is an added advantage in the field of optoelectric application (Bairava Ganesh et al, 2007).Energy band gap has been calculated from the UV-Vis absorbance data. Using the formula Eg = hc / λ , the band gap energy was found to be 4.133 eV. Figure 3. UV Transmission spectrum of BPNPMC. 3.4. Dielectric studies The study of dielectric properties of solid gives information about the electric field distribution within the solid. The frequency dependence of dielectric property gives the insight into the materials applications. V.Revathi Ambika et al./ Elixir Crystal Research 98 (2016) 42689-42692 42691 Dielectric measurements were performed on BPNPMC crystal (dimensions: 1.59mm thickness and area 16.45mm 2 ) using HIOKI-LCR HiTester 3535 in the frequency range 50Hz to 5MHz at room temperature... .The conventional parallel plate capacitor method was employed by coating the silver paste on the opposite faces of the crystal to get contact between crystal and electrodes. The variation of dielectric constant (εr), dielectric loss (tanδ) and AC conductivity (ζac) were measured at room temperature as a function of frequency. Dielectric constant has been calculated using the relation εr = Ct / εoA, (1) where C is capacitance, t is thickness of the sample, εo = 8.854x10-12Fm -1 is permittivity of free space and A is the area of cross section. The variation of εr and tanδ with applied frequency are shown in Figs.4 and 5 respectively. It is seen that dielectric constant value is high at low frequencies because, the electronic, ionic, dipolar and space charge or interfacial polarization are predominant. Further, as the frequency increases, the dielectric constant decreases and for high frequency region, it is almost constant. This can be explained based on polarization phenomenon. The electronic exchange between ions in the crystal gives local displacement of electrons in the direction of applied field, which causes the polarization. As the frequency of applied field increases a point will be reached where the space charge polarization cannot sustain and comply with variation of the external field and hence polarization decreases. The lower value of dielectric constant at higher frequency for a given crystal is a suitable parameter for the enhancement of SHG coefficient [18]. Fig.5, it is observed that the dielectric loss is high at lower frequency and the loss becomes less at higher frequencies. The characteristic of low dielectric loss at higher frequency indicates that the grown crystal has good optical quality with lesser defect and this parameter is of vital importance for nonlinear optical materials in their applications. Figure 4. Dielectric Constant Vs Log f. Figure 5. Dielectric Loss Vs Log f. The nature of decrease of dielectric constant and dielectric loss with frequency suggests that the grown crystal seems to contain dipoles of continuously varying relaxation times. As the dipoles of larger relaxation times are not able to respond to the high frequencies, dielectric constant and dielectric loss are low at high frequencies [19]. 3.5. Microhardness Study Measurement of hardness is an useful non-destructive testing method to determine the bond strength. The microhardness value correlates with other mechanical properties such as elastic constants and yield strength. The hardness of a material depends on different parameters such as lattice energy, Debye temperature, heat of formation and interatomic spacing[20–22]. According to Gong[23], during an indentation process, the external work applied by the indentor is converted into a strain energy component which is proportional to the volume of the resultant impression and a surface energy component is found to be proportional to the area of the resultant impression. Microhardness studies of any system has direct correlation with the crystal structure and is very sensitive to the presence of other phases or phase transition prevalent in the system. Microhardness studies were carried out on BPNPMC single crystals using Vickers hardness tester fitted with pyramidal indentor. The diagonal length of the indentation in mm for various applied loads in kg are measured for a constant indentation time of 15 s. The Vickers hardness number is calculated using the relation Hv = 1.8544 p/d 2 kg/mm 2 (2) The value of Hv increases as the load increases and finally decreases for higher loads in the range of 200g for the crystals. The variation of Hv with applied load for BPNPMC crystals is shown in Fig.6. Work hardening coefficient n, a measure of the strength of the crystal, is computed from the logp-logd plot (Fig.7). It brings forth the fact that the BPNPMC crystals are found to have been improved in mechanical strength. The plot of logp-logd yields a straight line and its slope, and the work hardening index, n are found to 1.33. The value of the work hardening co-effi | 2,016 | 0 | null | [
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} | null | https://www.semanticscholar.org/paper/009a59cb7b46fd06737e1471f3e39fe9087f6728 | Synthesis of lead chalcogenide alloy and core-shell nanowires. | Control over the dimensions and shape of nanostructures represents one of the main challenges in modern materials science. Morphology control of a variety of materials can be achieved using vapor–liquid–solid [1, 2] or solution–liquid–solid techniques [3] to obtain one-dimensional (1D) systems. The unique optical and electrical properties of 1D nanostructures make them one of most important building blocks for nanoscience and nanotechnology applications, and provide the opportunity for their integration in electronic, photonic, [4] thermoelectric, and sensor-based devices. Size control has been traditionally important and necessary to tune the optical and electrical properties of nano-materials by changing the band gap. This is particularly important in the strong confinement region, where one of the dimensions is smaller than the corresponding excitonic Bohr diameter. [6] Semiconductor alloy and core–shell nanowire systems represent another interesting direction towards functional nanostructures with enhanced structural and property tunability. Herein, we focus on preparing novel 1D heterostructures of IV–VI semiconductor nanomaterials. Lead chalcogenides are known to be good materials for thermoelectrics due to their low thermoconductivity. Pseudobinary (e.g. PbSeTe) and pseudoternary alloys (e.g. PbSnSeTe) have even lower lattice thermal conductivities than the binary compounds due to disorder-induced phonon scattering processes. Lead chal-cogenide materials are also good candidates for multi-exciton-generation (MEG) solar cells. [7] For example, previous reports showed quantum efficiencies as high as 300 % and 700 % for PbSe nanoparticles. Heterostructured alloy and core–shell nanomaterials have previously been shown for various materials, mainly II–VI semiconductor nanocrystals. For example, a quasi 1D system of CdSe–ZnS has been reported, [10] other systems include PbSe–PbS core–shell and alloy spherical nanoparticles developed by Lifshitz and co-workers. [11, 12] In addition, Talapin et al. have demonstrated the growth of PbS and Au onto PbSe nanowires. [13] The physical properties of these heterostruc-tured nanosystems are of interest for various applications as shown by the electronic structure calculations carried out by different groups. Here we demonstrate the formation of lead chalcogenide heterostructure nanowires by a solution-phase synthesis at moderate temperatures (see the Experimental Section). Two types of heterostructures (alloy and core–shell) were prepared by changing the concentration and temperature of the reaction. We were able to control the composition of the alloy and the thickness of the shell by changing the growth parameters. Three different systems, PbSe x S 1Àx alloys, and PbSe–PbS and PbSe–PbTe core–shell nanowires were prepared. Achieving these three targeted structures is nontrivial due to various competitive processes such as … | Angewandte Chemie | 2,008 | 53 | null | [
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} | https://www.semanticscholar.org/paper/009c220442e473d6f7d80988840a5c933b80ae3d | Fabrication of environmentally biodegradable lignin nanoparticles. | We developed a method for the fabrication of novel biodegradable nanoparticles (NPs) from lignin which are apparently non-toxic for microalgae and yeast. We compare two alternative methods for the synthesis of lignin NPs which result in particles of very different stability upon change of pH. The first method is based on precipitation of low-sulfonated lignin from an ethylene glycol solution by using diluted acidic aqueous solutions, which yields lignin NPs that are stable over a wide range of pH. The second approach is based on the acidic precipitation of lignin from a high-pH aqueous solution which produces NPs stable only at low pH. Our study reveals that lignin NPs from the ethylene glycol-based precipitation contain densely packed lignin domains which explain the stability of the NPs even at high pH. We characterised the properties of the produced lignin NPs and determined their loading capacities with hydrophilic actives. The results suggest that these NPs are highly porous and consist of smaller lignin domains. Tests with microalgae like Chlamydomonas reinhardtii and yeast incubated in lignin NP dispersions indicated that these NPs lack measurable effect on the viability of these microorganisms. Such biodegradable and environmentally compatible NPs can find applications as drug delivery vehicles, stabilisers of cosmetic and pharmaceutical formulations, or in other areas where they may replace more expensive and potentially toxic nanomaterials. | ChemPhysChem | 2,012 | 343 | null | [
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} | null | https://www.semanticscholar.org/paper/009cea2a2009c0665d51687117116cf81aef1da9 | SYNTHESIS AND SOLUTION COMPLEXATION STUDIES OF A NEW SCHIFF BASE LIGAND | A new Schiff base ligand, 2,2'-{pyridine-2,6-diylbis[nitrilo(E)methylylidene]}bis(4 bromophenol), has been synthesized by reaction of the 2,6-diamino pyridine with 5-bromo salicylaldehyde at ethanol under refluxing. The structure of the synthesized compound resulted from the IR, 1HNMR, MS and UV spectroscopy and elemental analysis data. Formation Constant (kf) value of it’s complexes with Cu, Ni, Cd, Co and Hg has been determined Conductometrically. The formation constants of the resulting 1:1 complexes have been calculated from the computer fitting of the molar conductance mole ratio data at different temperatures. The stability of the complexes to vary in acetonitrile solvent was in the order of Cu > Cd > Co > Hg > Ni. The enthalpy and entropy changes of the complexation reactions have been evaluated from the temperature dependence of formation constants. | 2,015 | 1 | null | [
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} | https://www.semanticscholar.org/paper/009f4eab01e722967d10215ecd7124890acf8256 | Polydispersity during the Formation and Growth of the Stöber Silica Particles from Small-Angle X-Ray Scattering Measurements. | The early stages of formation of Stöber silica particles have been investigated in situ during the hydrolysis and condensation of tetraethylorthosilicate under base-ammonia conditions in different alcoholic solvents. Time-resolved ultra-small-angle X-ray scattering by the entities produced in the solutions is used for structural characterization and monitoring of the growth kinetics of the particles. Our primary focus is to assess the polydispersity of the formed colloidal particles and its evolution as a function of time. We first applied a maximum entropy analysis of the scattering data to determine the size distribution and the time evolution of the size distribution of the colloidal particles. Second, we extended the cumulant method to analyze our earlier small-angle X-ray scattering data (H. Boukari, J. S. Lin, and M. T. Harris, J. Colloid Interface Sci. 194, 311, 1997; Chem. Mater. 9, 2376, 1997) and search for the presence of a distribution of fractal particles. The maximum entropy analysis indicates that there is a continuous nucleation of particles during the synthesis, and that this takes place within a relatively narrow size distribution. The cumulant analysis shows that, except at later times, the data are not adequate to confirm conclusively the presence of a distribution of fractal dimension at any time during the experiment. We discuss the impact of these results on growth kinetic models proposed for this system. Copyright 2000 Academic Press. | Journal of Colloid and Interface Science | 2,000 | 62 | null | [
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} | null | https://www.semanticscholar.org/paper/009fcfda794a9dedc83b4d6c92f114dc1ad9b8d5 | High performance nonvolatile memory devices based on Cu 2-x Se nanowires | We report on the rational synthesis of one-dimensional Cu 2−xSe nanowires (NWs) via a solution method. Electrical analysis of Cu 2−xSe NWs based memory device exhibits a stable and reproducible bipolar resistive switching behavior with a low set voltage (0.3–0.6 V), which can enable the device to write and erase data efficiently. Remarkably, the memory device has a record conductance switching ratio of 108, much higher than other devices ever reported. At last, a conducting filaments model is introduced to account for the resistive switching behavior. The totality of this study suggests that the Cu 2−xSe NWs are promising building blocks for fabricating high-performance and low-consumption nonvolatile memory devices. | 2,013 | 12 | null | [
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} | null | https://www.semanticscholar.org/paper/00a43b5d071d48925def90ec3c1d98281678c5ab | Stability-indicative, validated, fast HPLC method for quantification of two genotoxic impurities in imatinib mesylate | The objective of the current study is to develop a validated, specific and stability-indicating reverse phase liquid chromatographic method for the quantitative determination of genotoxic impurities in the drug substance imatinib mesylate. This report includes a brief review of the toxicology of impurities in imatinib mesylate and the strategies used to set acceptance criteria for genotoxic impurities in imatinib mesylate. A preliminary examination of different approaches to determine genotoxic impurities in the drug substance imatinib mesylate susceptible to its presence either as residue from the synthesis or from degradation are described based on the toxicology studies. Controlling the impurities during drug development enhances product quality and minimizes risk with respect to safety to the patient. Recent regulatory guidance on genotoxic impurities require lower reporting, identification, and qualification limits but the overall impurity control strategy is also driven by appropriate “as low as reasonably practicable” (ALARP) procedures that include assessment of process capability and associated analytical development techniques. The bulk drug imatinib mesylate containing the two genotoxic impurities impurity-1 and impurity-2 are subjected to stress conditions of hydrolysis (acid and base), oxidation, photolysis and thermal degradation as per International Conference on Harmonization (ICH)-prescribed stress conditions to show the stability-indicating power of the method. These two genotoxic impurities are also observed as degradation impurities during acid and base hydrolysis. The chromatographic conditions are optimized using an impurity-spiked solution and the generated samples are used for forced degradation studies. In the developed HPLC method, the resolution between impurity-1, impurity-2 of imatinib mesylate is found to be greater than 2. The chromatographic separation is achieved on a Develosil C8 UG-5 150 mm x 4.6 mm, 5-µm column. The HPLC method employed a linear gradient elution, and the detection wavelength is set at 240 nm. The developed HPLC method is validated with respect to linearity, accuracy, precision and robustness. | 2,011 | 6 | null | [
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},
{
"authorId": "5435375",
"name": "K. Babu"
},
{
"authorId": "10096469",
"name": "P. Narayanareddy"
}
] | null | null | 154 |
|
00a5dd641ad82421d00353b066296564e59bbee3 | {
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} | https://www.semanticscholar.org/paper/00a5dd641ad82421d00353b066296564e59bbee3 | Janus-type AT nucleosides: synthesis, solid and solution state structures. | Novel Janus-type nucleoside analogues (1a-d) were synthesized. Their pyrimido[4,5-d]pyrimidine base moiety has one face with a bidentate Watson-Crick donor-acceptor (DA) H-bond array of adenine and the other face with an acceptor-donor (AD) H-bond array of thymine. These nucleosides may self-associate through the self-complementary base pair. Indeed, in the solid state, compound 6d displayed a honeycomb-like supramolecular structure with tetrameric membered cavities formed through the combination of reverse Watson-Crick base pairs and aromatic stacking, in which the solvent molecules were accommodated. The result of temperature-dependent CD studies showed that the free nucleosides can form higher order chiral structures in aqueous solution. | Organic and biomolecular chemistry | 2,011 | 24 | null | [
{
"authorId": "5623425",
"name": "Mei-Ying Pan"
},
{
"authorId": "92420149",
"name": "Wenxian Hang"
},
{
"authorId": "2325489872",
"name": "Xiao-Jun Zhao"
},
{
"authorId": "51038871",
"name": "Hang Zhao"
},
{
"authorId": "2059443106",
"name": "Peng Deng"
},
{
"authorId": "37381035",
"name": "Zhihua Xing"
},
{
"authorId": "34558011",
"name": "Yong Qing"
},
{
"authorId": "46968409",
"name": "Yang He"
}
] | null | null | 155 |
00a6e24f8c7a13a5915ccb0c44bde15506acaff9 | {
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} | null | https://www.semanticscholar.org/paper/00a6e24f8c7a13a5915ccb0c44bde15506acaff9 | Biomimetic total synthesis of (±)-berkeleyamide D | We describe the total synthesis of (±)-berkeleyamide D using a biosynthetically inspired strategy. The spirocyclic core of berkeleyamide D was constructed via sequential epoxidations and a late-stage base-mediated cyclization of a biosynthetically relevant precursor. Our synthetic solution might be applicable to access other fungal natural products of this family. | 2,017 | 5 | null | [
{
"authorId": "6735849",
"name": "D. Jo"
},
{
"authorId": "49106923",
"name": "Sunkyu Han"
}
] | null | null | 156 |
|
00a75be94446380a7e7e249b0fdbc9175fa5bf39 | {
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"DOI": "10.1039/C5NJ00075K",
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} | null | https://www.semanticscholar.org/paper/00a75be94446380a7e7e249b0fdbc9175fa5bf39 | Facile synthesis of CdTe-based quantum dots promoted by mercaptosuccinic acid and hydrazine | CdTe-based quantum dots (QDs) with high photoluminescence quantum yields (PL QYs) were synthesized in a short time (less than 45 minutes). Mercaptosuccinic acid (MSA) was employed as a stabilizer and N2H4 as a growth promoter to accelerate the growth of CdTe and CdSexTe1−x QDs. Red-emitting CdTe QDs with a PL QY of 25% were obtained and the highest PL QY reached 55%. CdSexTe1−x QDs with emission peak positions of 518 nm to 750 nm were obtained. The rapid growth of QDs depends on the interaction between MSA and Cd2+, and N2H4 plays a key role in accelerating the growth to a certain level. Thus, the QD particle size can be controlled by manipulating N2H4 concentration in solution. A low N2H4 concentration seems feasible to obtain high-quality QDs. | 2,015 | 9 | null | [
{
"authorId": "2115408601",
"name": "Jiawei Tan"
},
{
"authorId": "13727954",
"name": "Yan-ming Liang"
},
{
"authorId": "48094326",
"name": "Jie-xin Wang"
},
{
"authorId": "49252005",
"name": "Jianfeng Chen"
},
{
"authorId": "7922963",
"name": "Baochang Sun"
},
{
"authorId": "46949303",
"name": "L. Shao"
}
] | null | null | 157 |
|
00a795fac6d41c1bba76e8065b80239f40df214f | {
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} | null | https://www.semanticscholar.org/paper/00a795fac6d41c1bba76e8065b80239f40df214f | Hydrothermal Synthesis, Crystal Structure and Electrochemical Property of a Ribbon‐like Coordination Polymer based on Octamolybdate Anions | A new coordination polymer based on octamolybdate anions and copper(II)-mebpa complex fragments, namely, [{Cu(mebpa)}2β-Mo8O26] (1), where mebpa is bis(2-pyridylmethyl)methylamine, has been synthesized under the hydrothermal reaction and characterized by single-crystal X-ray diffraction, IR, thermogravimetric analysis and cyclic voltammetry. 1 is formed from β-[Mo8O26]4− anions with {Cu(mebpa)}2+ fragments covalently attached via terminal oxygen atoms into a ribbon-like chain. The β-[Mo8O26]4− anions act as sexadentate ligands and the CuII ions adopt the common Jahn-Teller distorted “4+2” coordination. Owing to the weak C-H···O hydrogen bonding interactions, two crystallographically independent {CuN3O3} octahedra are located in the A and B layers respectively. The chemically modified carbon paste electrode (MCPE) displays well-defined cyclic voltammograms with three two-electron reversible redox couples in acidic aqueous solution and electrocatalytic activities toward the reduction of nitrite. | 2,008 | 4 | null | [
{
"authorId": "2143936127",
"name": "Yi Zhao"
},
{
"authorId": "145027862",
"name": "W. You"
},
{
"authorId": "48980798",
"name": "Limei Dai"
},
{
"authorId": "121860417",
"name": "Lancui Zhang"
},
{
"authorId": "144990599",
"name": "Dawei Song"
},
{
"authorId": "92371757",
"name": "Q. Dalian"
}
] | null | null | 158 |
|
00ab8f27a9c6e606a1862955c8d8ccf735b2e331 | {
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} | null | https://www.semanticscholar.org/paper/00ab8f27a9c6e606a1862955c8d8ccf735b2e331 | Dendritic Arenethiol-Based Capping Strategy for Engineering Size and Surface Reactivity of Gold Nanoparticles | The report describes a strategy for the synthesis of gold nanoparticles for which size and surface reactivity of the particles are controlled by the molecular sizes of dendritic arenethiols (DAT) as capping agents. This strategy exploits two important attributes of the DAT molecules: one involving the utilization of the umbrella-like structure with a single thiol as the anchorage handle and the other involving the rib with an expandable dendritic structure as a spacing-tunable cap. The synthesis of gold nanoparticles with controllable sizes below 10 nm has been demonstrated using different sizes of DAT in both one-phase and two-phase solutions. The unique structural properties of the dendritic arenethiol capping molecules not only enable the ability to control size growth of gold nanoparticles but also ready surface exchange reaction for surface derivatization and interparticle assembly. The viability of this strategy for the control of size and surface reactivity has been demonstrated by results from the... | 2,010 | 13 | null | [
{
"authorId": "2111314285",
"name": "Hong Yan"
},
{
"authorId": "153371217",
"name": "C. J. Wong"
},
{
"authorId": "35812266",
"name": "Anthony R. Chianese"
},
{
"authorId": "143604923",
"name": "Jin Luo"
},
{
"authorId": "48169603",
"name": "Lingyan Wang"
},
{
"authorId": "144880171",
"name": "Jun Yin"
},
{
"authorId": "4687638",
"name": "C. Zhong"
}
] | null | null | 159 |
|
00b0711e10dcf0efb7a4f67605e431eb3e115de9 | {
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} | null | https://www.semanticscholar.org/paper/00b0711e10dcf0efb7a4f67605e431eb3e115de9 | Solvent-free methods for controllable synthesis of metastable pharmaceutical solids | Mechanochemistry and vapor-induced transformations of solids have recently drawn attention as green and energy-efficient synthetic alternatives to classic solution procedures. Despite their growing importance and wide application in synthesis and transformation of various materials, from inorganic nanoparticles to soft supramolecular solids, mechanisms and kinetics of these solvent-free reactions are only now becoming unveiled through development of in situ monitoring methods based on powder X-ray diffraction (PXRD) [1] and Raman spectroscopy.[2] These advanced techniques allowed a real-time insight into mechanochemical and vapor-induced reactions without the need to interrupt them, revealing multi-step mechanisms often involving amorphization, recrystallization and various phase transformations. This talk will focus on the potential of mechanochemical reactions and vapor-induced transformations of solids for rapid, controllable and efficient synthesis of different cocrystal forms of active pharmaceutical ingredients (APIs),[3] presented here on the example of two model APIs, nicotinamide and carbamazepine. In situ monitoring by synchrotron or laboratory PXRD, combined in some instances with Raman spectroscopy, revealed particularly dynamic mechanisms underlying these solvent-free reactions, where different metastable intermediate phases could be detected before formation of the final cocrystal product. We will show here how the correlation between the reaction conditions and the occurrence of particular crystal form could be successfully used for governing the solvent-free reaction and isolation of target metastable forms, some of which are not accessible from solution. Herein presented results demonstrate suitability of mechanochemistry and vapor-induced reactions for controllable synthesis of pharmaceutical materials, and also provide an important contribution to development of new kinetic models of their reactivity. | 2,017 | 0 | {
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} | [
{
"authorId": "9824935",
"name": "K. Užarević"
}
] | http://journals.iucr.org/a/issues/2017/a2/00/a55210/a55210.pdf | journals.iucr.org | 160 |
|
00b0e783657a5b89640566541320bc87cbc1fa1a | {
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} | null | https://www.semanticscholar.org/paper/00b0e783657a5b89640566541320bc87cbc1fa1a | Synthesis and Characterization of Carbazole Dendrimers as Solution-Processed High Tg Amorphous Hole-Transporting Materials for Electroluminescent Devices | We report on an efficient and facile synthesis of up to 4th generation carbazole dendrons by using a mild Ullmann coupling reaction. The dendrimers, namely GnC (n = 1–4), are thermally stable amorphous materials with high glass transition temperatures (Tg) up to 347 °C and exhibit chemically stable redox properties. The compounds show great potential to work as solution-processed hole-transporting materials for electroluminescent devices. Double-layer Alq3-based organic light-emitting diodes employing these dendrimers as the hole-transporting layers with the device configuration of ITO/PEDOT: PSS/GnC(spin-coating)(40 nm)/Alq3(50 nm)/LiF(0.5 nm):Al(150 nm) emit a bright green color (λem = 514 nm) from the Alq3 layer, with maximum luminance, maximum current efficiency, and turn-on voltage of 29,262 cd m–2, 5.11 cd A–1, and 3.0 V, respectively. The abilities of GnC to act as hole-transporting materials in terms of thermal property and device performance are superior to common hole-transporters, N,N′-diphenyl-N,N′-bis(1-naphthyl)-(1,1′-biphenyl)-4,4′-diamine (NPB) and N,N′-bis(3-methylphenyl)-N,N′-bis(phenyl)benzidine (TPD). | 2,013 | 33 | null | [
{
"authorId": "9866168",
"name": "Narid Prachumrak"
},
{
"authorId": "92112066",
"name": "S. Pansay"
},
{
"authorId": "2372087",
"name": "S. Namuangruk"
},
{
"authorId": "16337875",
"name": "Tinnagon Kaewin"
},
{
"authorId": "2858008",
"name": "Siriporn Jungsuttiwong"
},
{
"authorId": "2668567",
"name": "T. Sudyoadsuk"
},
{
"authorId": "2818834",
"name": "V. Promarak"
}
] | null | null | 161 |
|
00b10fa3b0b71ece46b53c8580df8623b6b580cf | {
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} | null | https://www.semanticscholar.org/paper/00b10fa3b0b71ece46b53c8580df8623b6b580cf | Metal–Oxo and Dioxygen Chemistry in Metal–Organic Frameworks: Applications in Catalysis and Gas Separations | Author(s): Xiao, Dianne Jing | Advisor(s): Long, Jeffrey R | Abstract: The work herein describes progress towards using metal–organic frameworks as scaffolds for stabilizing metal–oxo and dioxygen species, and their application in hydrocarbon oxidation catalysis and O2/N2 separations. Metal–organic frameworks are a class of highly porous and functionally versatile crystalline solids consisting of inorganic cations or clusters bridged by organic linkers. They are attractive as solid supports for metal–oxo and dioxygen chemistry for many reasons, including the presence of well-defined, site-isolated metal centers with highly tunable local and outer coordination spheres.Chapter 1 provides an introduction to the electronic structure, reactivity, and biological relevance of metal–oxo and dioxygen species, with a particular emphasis on iron and cobalt. In addition, a brief historical overview of the development of biomimetic iron–oxo, iron–dioxygen, and cobalt–dioxygen chemistry, with selected molecular and heterogenous examples, is provided. The chapter concludes with a summary of the methods currently used to install coordinatively-unsaturated redox-active metal sites into metal–organic frameworks. A perspective on the potential of metal–organic frameworks in metal–oxo and dioxygen chemistry is given.Chapter 2 describes an initial foray into metal–organic framework-supported iron–oxo chemistry. Specifically, the nitrous oxide activation and hydrocarbon oxidation reactivity of the coordinatively-unsaturated iron(II) sites in the metal-organic frameworks Fe2(dobdc) and Fe0.1Mg1.9(dobdc) (dobdc4– = 2,5-dioxido-1,4-benzenedicarboxylate) is detailed. In the presence of N2O, the latter framework is able to selectively and catalytically convert ethane to ethanol upon mild heating. Structural and spectroscopic characterization of the initial iron(II)–N2O adduct and an iron(III)-hydroxide decay product, reactivity studies, and detailed electronic structure calculations strongly suggest that the active oxidant in this system is a high-spin, S = 2 iron(IV)–oxo. This rare electronic structure is a direct result of the weak ligand field imparted by the dobdc4– ligand.In addition to primary coordination sphere properties such as a weak ligand field, longer-range pore-environment effects could also become a powerful parameter in metal–organic framework catalyst design. Chapter 3 explores this idea in the context of solution-phase cyclohexane oxidation in the biphenyl and terphenyl expanded Fe2(dobdc) derivatives. A three-fold enhancement of the alcohol:ketone (A:K) ratio and an order of magnitude increase in turnover number is observed by simply altering the framework pore diameter and installing nonpolar, hydrophobic functional groups near the iron center. The increase in A:K selectivity is attributed to an increased affinity of the pore walls for cyclohexane, which may help increase its local concentration near the iron site.Chapter 4 departs from iron–oxo chemistry and oxidation catalysis, focusing instead on cobalt–dioxygen binding for O2/N2 separation applications. Specifically, this chapter details the reversible O2 binding properties of Co-BTTri (H3BTTri = 1,3,5-tri(1H-1,2,3-triazol-5-yl)benzene), a sodalite-type framework containing coordinatively-unsaturated cobalt(II). It was found that the O2 binding affinity could be tuned by altering the local ligand field. Electronic structure calculations reveal the extent of electron transfer from cobalt to O2 in these systems is highly dependent on the local environment, and can vary between 0.2 to 0.7 electrons.Chapter 5 combines aspects of both Chapter 1 and 4, focusing on the development of new iron(II)-based frameworks with tunable primary coordination spheres, and the effect of ligand field on reactivity and gas adsorption properties. The synthesis and characterization of two new sodalite-type frameworks, Fe-BTTri and Fe-BTP (H3BTP = 1,3,5-tri(1H-pyrazol-4-yl)benzene), is reported. Interesting O2 and CO gas adsorption properties are displayed by bulk Fe-BTTri, and are briefly described in this chapter. In addition, initial N2O/ethane oxidation studies performed on Fe-BTT suggest defect sites are responsible for the reactivity seen in this material, highlighting the inhomogeneity present even in highly crystalline metal–organic frameworks. | 2,016 | 0 | null | [
{
"authorId": "3292762",
"name": "D. Xiao"
}
] | null | null | 162 |
|
00b17f1ceda5367c854c2c93c50e50f13aa38a06 | {
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} | null | https://www.semanticscholar.org/paper/00b17f1ceda5367c854c2c93c50e50f13aa38a06 | Study on Application and Synthesis of Polypeptide Drug Carrier Nano-Hydroxyapatite | In this work, nano-hydroxyapatite (nHAP) particles, with uniform particle size and approximate spherical shape, were prepared by hydrothermal method using magnesium ion as nucleation inducer. nHAP was characterized by FTIR, SEM and TEM etc. The effects of insulin loading, such as loading time, loading temperature, pH of the solution for loading, and so on, were discussed. Insulin loaded nano-hydroxyapatite (INS-nHAP) was prepared. At the same time, release properties of INS-nHAP were evaluated. The results showed that the effective content of INS-nHAP was 3.98%wt, and the encapsulation efficiency was 92.66%wt when the concentration of insulin was used in 1 mg/mL, with pH = 3, 30 ̊C of the adsorption system temperature and 3 hours of the adsorption time. The cumulative release rate of INS-nHAP was 72.71%wt during the first six hours, which was about 55.58 units of INS, and was closed to the rate of insulin secretion under normal physiological conditions. The gel based on alginate polysaccharide and INS-HAP has obvious promotion effect on diabetic wound healing. | 2,019 | 0 | null | [
{
"authorId": "2068028455",
"name": "M. Tan"
},
{
"authorId": "2144389652",
"name": "Zhijie Yang"
},
{
"authorId": "2061174244",
"name": "N. Yao"
},
{
"authorId": "2153629216",
"name": "Yi Liu"
}
] | null | null | 163 |
|
00b1845c9120aeaffab5b3fd826f9670041dba8d | {
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} | null | https://www.semanticscholar.org/paper/00b1845c9120aeaffab5b3fd826f9670041dba8d | Neuartige kreuzförmige Oligomere aus Thienylen und Phenylen-Bausteinen | Thiophene- and phenylene-based π-conjugated oligomers have been widely investigated and
applied in different areas such as organic field-effect transistors (OFETs), charge- transportmaterials,
organic light emitting diodes (OLEDs), and solar cells. One of the most attractive
features of oligomeric materials for OFETs and OLEDs is their defined molecular structure
and the possibility to process them by solution-based techniques such as ink-jet printing or
spin-coating. The solubility of linear thiophene-and phenylene-based oligomers, even with
solubilizing terminal alkyl chains, is still a problem for solution-based device fabrication. The
work presented in this thesis focuses on the preparation of novel thiophene- and phenylene
based swivel-cruciform molecules as soluble oligomeric materials for OFET- and OLED
applications. The term swivel-cruciform, hereby, relates to the fact that there is some
conformational freedom within the cruciform molecule.
In chapter 4, the synthesis of unsubstituted swivel-cruciform oligothiophene dimers of
different lengths as well as hexyl-substituted swivel-cruciform oligothiophene dimers are
described. The dimers have been fully characterized by NMR, UV/Vis and DSC analysis.
Cyclic voltammetry (CV) measurements were carried out in order to elucidate the
electrochemical properties of the hexyl-substituted swivel-cruciform oligothiophene dimers.
For OFET investigations FET devices based on the unsubstituted and hexyl-substituted
swivel-cruciform oligothiophene dimers were built up from solution by spin-coating. The
results of the OFET measurements are presented as well as AFM investigations of the film
morphology. The OFET measurements show particularly high charge carrier mobilities and
on/off ratios for the hexyl-substituted swivel-cruciform oligothiophenes.
Chapter 5 presents synthesis and characterization (NMR, UV/Vis and DSC analysis) of
swivel-cruciform oligophenylene dimers with different substitution pattern. A single crystal
X-ray structure analysis of a naphtyl substituted swivel-curiciform oligophenylene illustrates
the cruciform structure with conformational flexibility. These materials have been used for in
OLED investigations as emitter material as presented in this chapter.
In Chapter 6 the synthesis and characterization of another type of swivel-cruciforms, so called
oligotriphenylamine dimers, is described. For comparison, also two oligotriphenylamines with
a star-shaped structure are presented. For these oligomers, CV measurements have been once
again recorded and illustrate the potential of these cruciforms as hole-transport layers for
multilayer OLEDs. | 2,006 | 0 | null | [
{
"authorId": "2065036836",
"name": "A. Bilge"
}
] | null | null | 164 |
|
00b3b4dcf0b8b321639cc5a9c0ab1a9aecda3830 | {
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"issn": "1616-5187",
"name": "Macromolecular Bioscience",
"type": "journal",
"url": "https://onlinelibrary.wiley.com/journal/16165195"
} | https://www.semanticscholar.org/paper/00b3b4dcf0b8b321639cc5a9c0ab1a9aecda3830 | Chemoenzymatic Synthesis of Oligo(L-cysteine) for Use as a Thermostable Bio-Based Material. | Oligomerization of thiol-unprotected L-cysteine ethyl ester (Cys-OEt) catalyzed by proteinase K in aqueous solution has been used to synthesize oligo(L-cysteine) (OligoCys) with a well-defined chemical structure and relatively large degree of polymerization (DP) up to 16-17 (average 8.8). By using a high concentration of Cys-OEt, 78.0% free thiol content was achieved. The thermal properties of OligoCys are stable, with no glass transition until 200 °C, and the decomposition temperature could be increased by oxidation. Chemoenzymatically synthesized OligoCys has great potential for use as a thermostable bio-based material with resistance to oxidation. | Macromolecular Bioscience | 2,016 | 21 | null | [
{
"authorId": "50032196",
"name": "Yinan Ma"
},
{
"authorId": "48662154",
"name": "Ryota Sato"
},
{
"authorId": "87666658",
"name": "Zhibo Li"
},
{
"authorId": "3584154",
"name": "K. Numata"
}
] | null | null | 165 |
00b59a269849b48193b55098dd9a1d24cd7157f2 | {
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} | null | https://www.semanticscholar.org/paper/00b59a269849b48193b55098dd9a1d24cd7157f2 | Synthesis method and application of Co (mtyp)2 with anticancer activity | The invention discloses a synthesis method and an application of Co (mtyp)2 with anticancer activity. A molecular formula of the complex Co (mtyp)2 is C20H22CoN8O6, the molecular weight is 529.39, and Hmtyp is 3-methoxy salicylaldehyde 3-amino-1,2,4-triazole Schiff base. The synthesis method comprises steps as follows: (1), analytically pure 3-methoxy salicylaldehyde and absolute ethyl alcohol are mixed, analytically pure 3-amino-1,2,4-triazole is added, then absolute ethyl alcohol is added, a mixture is heated in water bath, subjected to return flow agitation, filtered and washed with absolute ethyl alcohol for three times, and after drying, Hmtyp is obtained; (2), Hmtyp obtained in the step (1) is weighed and dissolved in an analytically pure N,N'-dimethylformamide solution, analytically pure cobaltous acetate is dissolved in distilled water, mixing agitation is performed, a product is left to stand in a drying oven at the temperature of 90 DEG C for 3 days, and the complex Co (mtyp)2 is obtained. Co (mtyp)2 can be applied to preparation of drugs resisting liver cancer, lung cancer and stomach cancer. The synthesis method and the application of Co (mtyp)2 with the anticancer activity have the advantages of simple process, low cost, good repeatability, high yield and the like, and chemical components are easy to control. | 2,016 | 0 | null | [
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"name": "林小芳"
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"name": "张海洋"
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} | https://www.semanticscholar.org/paper/00b68e8fb400c377bbbe2a1da27f32daed85fa2a | Guanosine-based hydrogen-bonded 2D scaffolds: metal-free formation of G-quartet and G-ribbon architectures at the solid/liquid interface. | We report on the synthesis and self-assembly of three novel lipophilic guanosine derivatives exposing a ferrocene moiety in the C(5') position of the sugar unit. Their self-association in solution, and at the solid/liquid interface, can be tuned by varying the size and nature of the C(8)-substituent, leading to the generation of either G-ribbons, lamellar G-dimer based arrays or the G4 cation-free architectures. | Chemical Communications | 2,015 | 31 | {
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} | https://www.semanticscholar.org/paper/00bbe89fddd2c28e32333749312b25ff08defb1c | Facile solution-phase synthesis of γ-Mn3O4 hierarchical structures | null | Chemistry Central Journal | 2,007 | 23 | {
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"name": "Yaobin Huang"
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"name": "Cheng Pan"
},
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"name": "Yinjuan Xie"
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] | https://bmcchem.biomedcentral.com/counter/pdf/10.1186/1752-153X-1-8 | bmcchem.biomedcentral.com | 168 |
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} | null | https://www.semanticscholar.org/paper/00c094a6eda5b7399331b85795a95e7922932477 | Synthesis and Characterization of Nanosilver-A blue green approach | In our thorough investigation of suitability of cyanobacterial strains, commonly known as blue green algae, for cheap ecofriendly nanometal formation, Leptolyngbya valderianum was found to be an effective bioreagent for nanosilver production. The nanosilver synthesis at intracellular level was indicated by the brown biomass of Leptolyngbya after 72 hrs of dark exposure in 9 mM AgNO3 solution. Intracellular silver particles were extracted from the silver loaded biomass and nanosilver production was determined by UV-vis spectroscopy showing absorption peak at ~411 nm. Extracted nanoparticles were further characterized by dynamic light scattering (DLS), zeta potential and X-ray diffraction (XRD) studies. Transmission electron microscopy (TEM) revealed the spherical shape of AgNPs with 2 to 20 nm in diameter. The XRD indicated the 2θ values at 38.20, 44.50, 65.60 and 78.60 which confirmed again the reduction of Ag (I) to Ag (0). Antibiotic property of the AgNP was tested by Agar well diffusion method. Introduction Silver nanoparticles commonly used for nanomedicine production , are reported to be nontoxic to human but most effective against bacteria, viruses, and other eukaryotic microorganisms at very low concentration (Jeong et al. 2005). They are also effective against tumors with anti-proliferative activity (Sriram et al. 2010). The antimicrobial property allows them to be suitably employed in numerous products such as textiles, food storage containers, home appliances and especially in medical devices (Marambio-Jones et al. 2010). Use of AgNP is in medicine industry as tropical ointments to prevent infection against burn and open wounds is quite effective (Ip et al. 2006). Silver nanoparticles (AgNPs) play important role as pesticide filter also (Pradeep and Anshup 2009). Silver nanoparticles are synthesized by different physical and chemical methods like sol-gel technique, solvo-thermal synthesis, chemical reduction, laser ablation, inert gas condensation etc (Huy et al. 2013). The time consuming physical methods are often difficult to achieve and in chemical methods different toxic reagents are used as capping agent like, cetyl trimethyl ammonium bromide (CTAB) leading to undesirable functional aberrations in target cells. Both physical and chemical procedures are very expensive also. Therefore biosynthesis of AgNPs are becoming popular day by day using microorganisms like bacteria (Klaus et al. 1999, Sweeney et al. 2004, Nair and Pradeep 2002); fungi (Ahmad et al. 2003, Ingle et al. 2009, Mukherjee et al. 2001, Gade et al. 2008, Sanghi et al. 2009) and algae (Govindaraju et al. 2009, Mohseniazar et al. 2011). Only sporadic reports are available regarding filamentous cyanobacteria based AgNP production like, Plectonema boryanum(Lengke et al. 2007), Oscillatoria willei (Ali et al. 2011) and Spirulina platensis (Govindraju et al. 2008). In search for a very suitable bio-reagent for AgNP production, we recorded Leptolyngbya valderianum as more effective strain, as it is widespread in distribution than the studied taxa. They flourish from freshwater to marine region, moreover very cheap production of biomass is possible within very short time reducing the production cost of the nano-metal. Size determination was done in the present investigation employing TEM study and complete characterizations of AgNP were made by XRD, DLS, and Zeta potential studies. Rate of AgNP production per gm biomass was determined and pure nanometal was extracted from the biomass. Antibiotic property was determined by agar well diffusion methods. All these studies would analyze the structure and stability of AgNP in pure form and can be used for further exploitation. Materials and methods The experimental strain, L. valderianum was collected from eastern part of India (Suderbans, West Bengal) and pure strain was obtained from Phycology Laboratory, CU. A small portion of healthy growing biomass (10 mg FW) was exposed to 100 ml of 9 mM Ag (I) solution (pH 3.86), (AgNO3, MW 169.86, Merck, India) and was kept in dark condition at room temperature. After 72 h yellowish brown biomass was removed from the silver nitrate solution and washed with double distilled water. To extract the particles, algal biomass was sonicated for 30 min at 60% amplitude with 7.5 mM sodium citrate solution by a Hielscher UP100H ultrasonic processor (Teltow, Germany) and was centrifuged at 3000 rpm for 5 min in a C-24 BL Remi cooling centrifuge (Maharashtra, India). The supernatant was collected for further analysis. A UV-vis spectrum of the extract was recorded in the wavelength range of 200nm-1100nm with a Thermo Evolution 300 UV-visible spectrophotometer (Waltham, USA). DLS measurement was done with 1 mL of suspension using Nano ZS (Malvern) to study the hydrodynamic size of the particles distributed in citrate solution. Zeta potential of the suspension was determined using the same instrument to determine the stability of the nanoparticles. Silver loaded brown colored biomass was air-dried, made it into powder using mortar and pestle and used for powder XRD analysis. The XRD spectra were recorded from 5° to 100° 2θ angles with a Panalytical PW 3040/60, DY 2501 X-ray diffractometer (Netherland) using Cu Kα radiation operated at 40 kV and 30 mA to confirm the presence of Ag (0). A drop of nanoparticle extract was dried on a carbon coated copper grid and the morphology and size analysis of biosynthesized AgNPs was carried out by JEOL JEM 2100 HR-TEM. The extracted golden brown suspension was lyophilized and nano silver production rate was determined in relation to biomass weight (mg/gm biomass). Antibacterial activity of the synthesized silver nanoparticles was determined using the agar well diffusion method against gram negative bacteria Pseudomonas aeruginosa (MTCC 424). The bacterial strain was obtained from Microbial type culture collection and gene bank (MTCC, Chandigarh, India). The inoculums suspensions were spread uniformly in different nutrient agar plates. Cavities were made in each plate using a well-cutter and it was filled with silver nanoparticle solution (100 ml) with different concentions, 1 mg/ml, 0.5 mg/ml, and 0.1 mg/ml and then incubated at 37 °C. Sodium citrate was used as negative control because AGNPs were suspended in citrate solution. The diameter of clear zone was measured. | 2,011 | 26 | null | [
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} | https://www.semanticscholar.org/paper/00c2a2c261ad00f1eb912e47d08d318469a781ea | Size and shape-controlled synthesis of Ru nanocrystals | Abstract Mastery over the size/shape of nanocrystals (NCs) enables control of their properties and enhancement of their usefulness for a given application. Within the past decades, the development of wet-chemistry methods leads to the blossom of research in noble metal nanomaterials with tunable sizes and shapes. We herein would prefer to devote this chapter to introduce the solution-based methods for size and shape-controlled synthesis of ruthenium (Ru) NCs, which can be summarized into five categories: (i) Synthesis of spherical Ru NCs; (ii) synthesis of one-dimensional (1D) Ru NCs, e.g. wires and rods; (iii) synthesis of two-dimensional (2D) Ru NCs, e.g. nanoplates; (iv) synthesis of Ru NCs with hollow interiors and (v) synthesis of Ru NCs with other morphologies, e.g. chains, dendrites and branches. We aim at highlighting the synthetic approaches and growth mechanisms of these types of Ru NCs. We also introduce the detailed characterization tools for analysis of Ru NCs with different sizes/shapes. With respect to the creation of great opportunities and tremendous challenges due to the accumulation in noble metal nanomaterials, we briefly make some perspectives for the future development of Ru NCs so as to provide the readers a systematic and coherent picture of this promising field. We hope this reviewing effort can provide for technical bases for effectively designing and producing Ru NCs with enhanced physical/chemical properties. Graphical Abstract: The solution-based methods for size and shape-controlled synthesis of ruthenium nanocrystals as well as the mechanisms behind them are extensively reviewed. | Physical Sciences Reviews | 2,018 | 4 | null | [
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"name": "Linlin Xu"
},
{
"authorId": "2146154880",
"name": "Jun Yang"
}
] | null | null | 170 |
00c41e98d1b1b0535267a60254997c5676e35208 | {
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} | null | https://www.semanticscholar.org/paper/00c41e98d1b1b0535267a60254997c5676e35208 | Synthesis of Catalytic Membranes for the Oxidation of Organic Pollutants in Wastewater | null | 2,017 | 0 | null | [
{
"authorId": "1411644826",
"name": "M. Gutiérrez-Arzaluz"
},
{
"authorId": "1399842337",
"name": "V. Mugica-Álvarez"
},
{
"authorId": "1422110912",
"name": "M. Torres-Rodríguez"
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] | null | null | 171 |
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00c6bd1c92fd629d309bacdb4ce342b9d85de37f | {
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"name": "Journal of applied physiology",
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} | https://www.semanticscholar.org/paper/00c6bd1c92fd629d309bacdb4ce342b9d85de37f | Effects of postexercise milk consumption on whole body protein balance in youth. | In adults, adding protein to a postexercise beverage increases muscle protein turnover and replenishes amino acid stores. Recent focus has shifted toward the use of bovine-based milk and milk products as potential postexercise beverages; however, little is known about how this research translates to the pediatric population. Twenty-eight (15 girls) pre- to early pubertal (PEP, 7-11 yr) and mid- to late-pubertal (MLP, 14-17 yr) children consumed an oral dose of [(15)N]glycine prior to performing 2 × 20-min cycling bouts at 60% V̇O(2 peak) in a warm environment (34.5°C, 47.3% relative humidity). Following exercise, participants consumed either water (W), a carbohydrate-electrolyte solution (CES), or skim milk (SM) in a randomized, cross-over fashion in a volume equal to 100% of their body mass loss during exercise. Whole body nitrogen turnover (Q), protein synthesis (S), protein breakdown (B), and whole body protein balance (WBPB) were measured over 16 h. Protein intake from SM was 0.40 ± 0.10 g/kg. Over 16 h, Q and S were significantly greater (P < 0.01) with SM than W and CES. B demonstrated a trend for a main effect for beverage (P = 0.063). WBPB was more negative (P < 0.01) with W and CES than with SM. In the SM trial, WBPB was positive in PEP, although it remained negative in MLP. Boys exhibited significantly more negative WBPB than girls (P < 0.05). Postexercise milk consumption enhances WBPB compared with W and CES; however, additional protein intake may be required to sustain a net anabolic environment over 16 h. | Journal of applied physiology | 2,014 | 11 | null | [
{
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"name": "Kimberly A. Volterman"
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"name": "J. Obeid"
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"name": "B. Wilk"
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"name": "B. Timmons"
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} | null | https://www.semanticscholar.org/paper/00c7ae38caba7476fdcc4019d2bab91034f2ba47 | A highly selective fluorescent and colorimetric chemosensor for Hg2+ based on a new rhodamine derivative | The design and synthesis of a novel chemosensor 1 based on rhodamine B and 4-chloro-7-nitro-2,1,3-benzoxadiazole (NBD-Cl) and its application in fluorescence and colorimetric detection of Hg2+ in aqueous solution are reported. The signal change of the chemosensor 1 is based on a specific metal ion induced ring-opening mechanism of the rhodamine spirolactam. It exhibits a high sensitivity and selectivity for the detection of Hg2+ over other tested metal ions in CH3CN : H2O = 1 : 1, and the detection limit can reach 120 nM. In addition, the effects of co-existing metal ions and pH are also investigated. The data obtained clearly indicate that 1 could be used as an excellent chemosensor for Hg2+ detection in environmental samples. | 2,016 | 21 | null | [
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"name": "Jian Chen"
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"name": "L. Ya"
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"authorId": "50264901",
"name": "Peisheng Zhang"
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{
"authorId": "1768713",
"name": "Jian-hui Jiang"
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] | null | null | 173 |
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} | null | https://www.semanticscholar.org/paper/00c974ad5ba491b841645b8e38542118afbf9e91 | Synthesis of a new highly sensitive near-infrared fluorescent iridium(III) probe and its application for the highly selective detection of glutathione | A new near-infrared fluorescent probe 1 based on the IR 780 skeleton was designed, synthesized and structurally characterized for the development of a chemosensor. UV-vis absorption and fluorescence spectroscopic studies show that probe 1 exhibits a high selectivity and sensitivity towards iridium(III) in an EtOH/H2O (1:4, v/v, pH 7.4, HEPES buffer, 1 mM) solution by forming a 1:1 complex with iridium(III). Experimental results further demonstrate that the probe 1–iridium(III) complex also has excellent application for the highly selective detection of glutathione. | 2,015 | 5 | null | [
{
"authorId": "47665997",
"name": "Hailang Chen"
},
{
"authorId": "48570821",
"name": "Xiaofeng Bao"
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{
"authorId": "2146316349",
"name": "Feng Li"
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{
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{
"authorId": "36056543",
"name": "Ren-long Ye"
},
{
"authorId": "2146271347",
"name": "Jing Zhu"
}
] | null | null | 174 |
|
00cf97446d191670c0285bb02a5d30a40b0ecf1d | {
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} | null | https://www.semanticscholar.org/paper/00cf97446d191670c0285bb02a5d30a40b0ecf1d | Structural and Optical Characterization of Luminescent (Y0.7Gd0.3)2O3:Eu3+Nanopowder and translucent Ceramics | Phosphor nanomaterials are of special interest today due to their broad range of applications from the solid state lightening and novel flat displays to high resolution X-ray detectors and sensors in biomedicine. Among them polycrystalline Eu 3+ doped mixed oxide (Y1-xGdx)2O3 is a well-known luminescent material widely used to provide red light emission for modern optoelectronic devices [1–3]. Both Y2O3 and Gd2O3 have the cubic bixbyite structure with space group Ia-3 and can form complete solid solutions. This mixed oxide phosphor is a very good scintillator, as ceramic it is already commercially used for the X-ray computed tomography medical imaging [4]. The transparency and consequently light outputs of sintered ceramics depend on their composition. Gd2O3 has a high X-ray absorption coefficient and changing its concentration enables tuning of the X-ray stopping length. Light output of sintered scintillator (Y1-xGdx)2O3, doped with Eu 3+ is maximum for pure Y2O3, however the optimal composition regarding X-ray stopping length is found for (Y0.7Gd0.3)2O3:Eu3+ solid solution [5]. In this work we report on the successful synthesis of (Y0.7Gd0.3)2O3:Eu 3+ luminescent nanopowder and on the processing conditions with which translucent ceramic pellets can be easily obtained. Nanopowder of (Y0.7Gd0.3)2O3, doped with 3 % at. Eu 3+ has been prepared with the polymer complex solution method employing polyethylene glycol (PEG). This synthesis method provides powders crystallized in a cubic structure, made of nanoparticles uniform in size, which is a prerequisite for obtaining high quality transparent ceramics. The quality of produced powder is confirmed by XRD and TEM measurements. Resulting nanopowder was cold-pressed, uniaxially, into pellets of 12 mm in diameter, and then sintered in air for 18 hours, without any additives. Twenty five different ceramic samples were prepared by varying the load from 2 to 10 tones/cm 2 (2, 4, 6, 8 and 10) and sintering temperature up to 1400°C (800, 1000, 1200 and 1400°C). The progressive development in ceramic samples was monitored with SEM and luminescent spectroscopy. Based on acquired results we concluded that in the stimulation of the sintering process the most effective are temperatures above 1200°C and the loads of 8 and 10 tones/cm 2 . However, the best results are obtained for the pellet obtained under the maximum load of 10 tones when annealed at 1400°C. These experimental setups led to the finest grains formation and almost complete disappearance of all voids from the ceramic pellet (see Figure 1). The optical properties remained unchanged for the sintered samples when well developed grains are formed together with a low pore concentration. Luminescence emission of ceramic samples decay faster than for the corresponding nanopowder and this is actually in complete agreement with the grain formation and transformation to the bulk ceramic material. We found out that the asymmetry ratio, obtained from the luminescence emission measurements, may be utilized as an indicator of the structural consolidation of ceramics during thermal treatments. | 2,009 | 0 | null | [
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} | https://www.semanticscholar.org/paper/00d0e226ad33b68fe26749eec85f85d292ad96d7 | Metal-Nitrogen-Carbon Catalysts for Oxygen Reduction in PEM Fuel Cells: Self-Template Synthesis Approach to Enhancing Catalytic Activity and Stability | null | Electrochemical Energy Reviews | 2,019 | 133 | {
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"authorId": "48479437",
"name": "Yanghua He"
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"authorId": "47716446",
"name": "Q. Tan"
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"authorId": "5175102",
"name": "Leilei Lu"
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] | https://link.springer.com/content/pdf/10.1007%2Fs41918-019-00031-9.pdf | link.springer.com | 176 |
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} | null | https://www.semanticscholar.org/paper/00d36a7d5cb3a8c989612d52c106144030957157 | Synthesis and Structures of Compounds Based on Chalcocyanide Tetranuclear Rhenium Clusters: Bonding Cluster Complexes by diene‐Bridged CuII Units | Six new tetrahedral chalcocyanide cluster compounds, [{Cu2(dien)3}Re4S4(CN)12] (1), [{Cu(dien)(NH3)}2Re4Se4(CN)12]·2.5H2O (2), [{Cu2(dien)3}Re4Q4(CN)12]·nH2O (Q = Se (3), Te (4)] and [K(H2O)2]2[{Cu3(dien)4}{Re4Q4(CN)12}2]·8H2O where Q = Se (5), Te (6) (dien = diethylenetriamine), have been synthesized by treating aqueous solutions of the salt-like cluster compounds K4Re4Q4(CN)12·nH2O with solutions of copper(II) chloride in aqueous ammonia containing diethylenetriamine. All six compounds have been characterized by single-crystal X-ray diffraction analysis. Compound 1 has a chain-like polymeric structure; orthorhombic, space group Pmn21. Compound 2 has a molecular structure; triclinic, space group P . Compounds 3 and 4 are isostructural and also exhibit molecular structures; monoclinic, space group P21/n. Compounds 5 and 6 are isostructural and display a cross-bridged chain-like polymeric structure; triclinic, space group P . (© Wiley-VCH Verlag GmbH & Co. KGaA, 69451 Weinheim, Germany, 2003) | 2,003 | 31 | null | [
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} | https://www.semanticscholar.org/paper/00d8c68b01cb2078e07482702d364b9c237654ee | Superb Capacity of Magnetic Sludge-Floc-Based Adsorbents for Congo Red: Synthesis and Adsorption Studies | null | Journal of Inorganic and Organometallic Polymers and Materials | 2,018 | 2 | null | [
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} | https://www.semanticscholar.org/paper/00dd2d15beacf5674eb679b0466c438cbd2fdc38 | Core-double shell ZnO/ZnS@Co3O4 heterostructure as high performance pseudocapacitor. | In recent times, a great deal of attention has been paid to the balanced design and fabrication of core-shell heterostructures for enhanced pseudocapacitor (SC) performance. In this paper, we report the synthesis of ZnO@Co3O4 based core-shell heterostructures with controllable shell thickness for the first time by a simple low-temperature solution-based method and their detailed electrode performance as SC wherein a highly enhanced pseudocapacitance of 296 C g(-1) at a current density of 0.5 A g(-1) has been observed. Further, modifying the surface of ZnO by its sulfur analogue (i.e., by creating a ZnO/ZnS heterostructure), an improved capacitance of 317 C g(-1) at a current density of 0.5 A g(-1) for ZnO/ZnS@Co3O4 has been obtained along with a better rate performance. This is attributed to an efficient charge transfer from ZnS to ZnO. Impressively, the core-double shell heterostructure exhibits high energy density of 36 Wh kg(-1) at a power density of 204.3 W kg(-1). Even at a very high power density of 10.9 kW kg(-1), it shows an energy density of 14.7 Wh kg(-1). To the best of our knowledge, this is the first study of the electrochemical properties of ZnO/ZnS@Co3O4 heterostructure. | Dalton Transactions | 2,016 | 12 | null | [
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00e51ad3d9946da8aa3015777c2896f8daf73bcb | {
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} | null | https://www.semanticscholar.org/paper/00e51ad3d9946da8aa3015777c2896f8daf73bcb | Synthesis and characterization of new luminescent complexes based on Copper(I) Iodide | The copper iodide complexes are known for their large variety of coordination geometries. Such diversity, while making it difficult to predict the final structure, permits the preparation of a great number of copper iodide complexes based on the same ligand. The target of the research was that of thoroughly exploring the chemistry of CuI and the ligand diphenyl-2-pyridyl phosphine (PN) by varying the stoichiometric ratio and/or the aggregation state. Six different compounds have been identified: [Cu4I4(PN)2], [Cu4I4(PN)2∙(CH2Cl2)0.5], [CuI(PN)0.5]∞, [CuI(PN)3] whose structures have been determined during this study, CuI(PN)2 which was characterized by powder diffraction and [Cu2I2(PN)3] which has been already reported. The preparation routes are also different: synthesis in solution yielded [Cu4I4(PN)2∙ (CH2Cl2)0.5] and [CuI(PN)3] while [CuI(PN)0.5]∞ and CuI(PN)2 were obtained only via solid state reactions. These two latter examples confirmed that mechanochemistry is a valid route to explore the landscape of the possible structures of CuI derivatives. Crystallization by traditional solution procedures failed to give the desired crystal, so structure determination of the new compounds was tackled in two ways: by attempting crystal growth via solvothermal synthesis and by resolving the structure from X-ray powder diffraction data with “direct space” methods. What is more the photophysical properties of the complexes that could be obtained as sufficiently pure powders have also been investigated and are reported herein. | 2,017 | 0 | null | [
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"name": "Robert F. Kennedy"
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} | null | https://www.semanticscholar.org/paper/00e7fceb292b3c438257834507cc2c6dc0446a2d | Biodegradable containers based on nanostructured polycrystals obtained by controlled crystallization | Multilayer containers fabricated via layer-by-layer sequential deposition of polymers onto a sacrificial core template represent a versatile delivery system for a variety of species used in biomedicine. From a several colloid templates calcium carbonate is of particular interest due to the mild conditions of decomposition. Among the polymorph modifications of calcium carbonate, vaterite particles are favourable due to their porous structure, ability to absorb and release a variety of bioactive compounds. The common CaCO3 synthesis method of mixing aqueous solutions of calcium chloride and sodium carbonate allows spherical vaterite particles with the size ranging from 5 µm to 15 µm, while drug delivery applications require carriers small enough to penetrate the blood capillaries and cells. So the size of calcium carbonate particles has to be reduced and the main goal of the research is to develop a synthesis method that allows submicron porous vaterite particles in a size-controlled manner. Besides, vaterite structure is still under debate what is the best for our knowledge. To achieve the controlled crystallization of vaterite with desired size a systematic study has been undertaken. The strong influence of mixing time, concentration of reagents and its ratio on the size and structure of calcium carbonate particles was observed. Stable vaterite particles with average diameter 350-500 nm were synthesized after the optimization of the crystallization conditions. It was shown that these spherical particles are formed by attachment of vaterite nanocrystallites. The analysis of the broadening of vaterite diffraction lines reveals the well-defined anisotropic shape of crystallites, which can be described by biaxial ellipsoid with main axes 50 and 100 nm. Owing to such structure submicron vaterite spheres possess a high degree of porosity and therefore good absorption ability that makes them suitable for encapsulation purposes. Surface area of the particles with average size of 500 nm determined by the method of gas adsorption/desorption amounted to 16,1 m2/g, and the pore size – 30-80 nm. The obtained particles were used as a template for polymer multilayer capsules comprising 2 and 4-bilayers of biodegradable polyelectrolytes poly-L-arginine and dextran sulfate. In order to confine the capsule size to the nanoscale to meet in vivo requirements, a new approach involving temperature exposure was employed. The heat induced shrinking results in approximately 50% decrease of average capsule diameter containing both odd and even number of polymer layers. The designed biocompatible carriers with size less than 300 nm were loaded with doxorubucin. Capsules uptake, toxicity and antitumor activity of encapsulated doxorubucin were studied by means of MTT-test in vitro. | 2,017 | 0 | {
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] | http://journals.iucr.org/a/issues/2017/a2/00/a56381/a56381.pdf | journals.iucr.org | 183 |
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} | https://www.semanticscholar.org/paper/00ecda2d7820426cace227e6fd66cf526dfef84a | Ultrasonic Intensification To Produce Diester Biolubricants | Biolubricants synthesized from vegetable oils with oleic acid and 1,3-propanediol possess better cold flow properties and have a smaller environmental footprint than mineral-based lubricants. However, their synthesis is lengthy (>6 h) and requires temperatures above 120 °C. We applied ultrasound (US) to synthesize long-chain diesters (biolubricants): an ultrasonic horn delivered rated powers of 500 and 750 W at a frequency of 20 kHz to a solution of oleic acid and 1,3-propanediol. Amberlyst15-H esterified the acid to the diester biolubricant. US horns with powers of 750 and 500 W increased the reaction rate by factors of 2 and 1.2–1.5, respectively. A temperature of 100 °C is necessary to convert oleic acid to >50%. A partial factorial experimental design confirmed that temperature, US power, and initial molar ratio of reactants affect reaction rate and oleic acid conversion (p-value of <0.05). The 500 W horn is 17% less expensive than the 750 W horn. | Industrial & Engineering Chemistry Research | 2,019 | 16 | null | [
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00f133f145cc74705ab65222b4e7ab97c4c1d547 | {
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} | null | https://www.semanticscholar.org/paper/00f133f145cc74705ab65222b4e7ab97c4c1d547 | A Phase-Field Method for Topology Optimization with Three Material Phases | In this paper we present a phase-field method to the problem of shape and topology synthesis of structures with three materials. A single phase model is developed based on the classical phase-transition theory in the fields of mechanics and material sciences. The multi-material synthesis is formulated as a continuous optimization problem within a fixed reference domain. As a single parameter, the phase-field model represents regions made of any of the three distinct material phases and the interface between the regions. The Van der Waals-Cahn-Hilliard theory is applied to define a dynamic process of phase transition. The Г-convergence theory is used for an approximate numerical solution to this free-discontinuity problem without any explicit tracking of the interface. Within this variational framework, we show that the phase-transition theory leads to a well-posed problem formulation with the effects of “domain regularization” and “region segmentation” incorporated naturally. The proposed phase-field method is illustrated with several 2D examples that have been extensively used in the recent literature of topology optimization, especially in the homogenization based methods. It is further suggested that such a phase-field approach may ‡ represent a promising alternative to the widely-used homogenization models for the design of heterogeneous materials and solids, with a possible extension to a general model of multiple material phases. | 2,004 | 0 | null | [
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} | https://www.semanticscholar.org/paper/00f16eb39a0bc92100dd86f60248c00e19fa57ec | Ultrathin Ca-PO4-CO3 solid-solution nanowires: a controllable synthesis and full-color emission by rare-earth doping. | It was found that calcium carbonate (CaCO(3)) and hydroxyapatite (Ca(10)(OH)(2)(PO(4))(6)), which are two crucial constituents of the most abundant minerals in nature and very important bioinorganic components in the tissues of mineralizing organisms, can form solid solutions in a wide range of PO(4)(3-)/CO(3)(2-) (P/C) ratios at low temperature when prepared as ultrathin nanowire structures. This is due to the special reactivity of ultrasmall nanocrystals, which can effectively lower the synthetic temperature and promote the formation of solid solutions. The as-prepared ultrathin nanowires with suitable P/C ratios presented strong blue luminescence due to the existence of abundant defects strengthened by CO(3)(2-). If used as the matrix, the as-prepared ultrathin nanowires demonstrated bright green or red luminescent properties when doped with Tb(3+) or Eu(3+) ions, and simultaneously retained their original morphologies. These three kinds of fluorescent nanowires could reproduce a full range of luminescence colors based on additive color mixtures of the three primary colors (red, green, and blue). In addition, under the same reaction system, ultrafine rare-earth-doped (Ce(3+), Tb(3+), Eu(3+)) nanowires (about 1 nm in diameter) were synthesized by using a one-step hydrothermal process, which further pushed the size of the Ca-PO(4)-CO(3) nanobuilding blocks to one unit cell region. These ultrafine nanowires displayed excellent film-forming properties and the ability to absorb UV radiation. | Chemistry | 2,012 | 21 | null | [
{
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"name": "Biao Xu"
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{
"authorId": "1701500",
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] | null | null | 186 |
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} | null | https://www.semanticscholar.org/paper/00f53327149c06ec074a87ee961b6bc5e94c05b1 | Synthetic, Reactivity, and Mechanistic Studies Relevant to Olefin Oligomerization and Polymerization | Chapters 2 and 3 present synthetic, structural, and mechanistic studies relevant to the selective trimerization of ethylene to 1-hexene using a chromium diphosphine catalyst system. The studied diphosphines, PNPL=(o-L-C6H4)2PN(Me)P(o-L-C6H4)2, display a PNP backbone with phosphine-aryl groups ortho-substituted with ethers, amines, or thioethers (L=OMe, NMe2, or SMe). Chromium(0) and chromium(III) complexes have been prepared, characterized structurally, and tested for catalytic activity, highlighting the importance of the pendant ether groups. A chromacyclopentane model complex, (PNPO4)Cr(o,o-biphenyldiyl)Br, has been isolated using the parent phosphine system (PNPO4, L=OMe). Starting with this model system, the olefin trimerization reaction has been investigated using trans-, cis-, and gem-d2-ethylene as well as mixtures of C2D4 and C2H4. The selectivity of alpha-olefin insertion into the chromacyclopentane mimic and that of beta-H elimination from chromacycloheptanes have been studied. The relative rates of insertion of terminal and internal olefins into the chromacyclopentane moiety have been measured.
Chapters 4, 5, and 6 present synthetic studies of tantalum, titanium, and zirconium complexes supported by a new tridentate bisphenolate framework, along with applications to olefin polymerization and mechanistic studies of organometallic transformations based on these architectures. The utilized ligand framework involves a bisphenol connected at the ortho positions via semirigid, ring-ring (sp2-sp2) linkages to a flat ring (pyridine, thiophene, furan, or benzene). These ligands were found to coordinate to metals in a mer fashion to give a variety of binding geometries. A tantalum system supported by the benzene bridged bisphenolate was found to undergo intramolecular CH activation faster than metal-alkyl protonolysis by a pendant phenol, un unprecedented process for early metals. An alpha-H abstraction reaction has afforded access to a tantalum benzylidene supported by the pyridine linked bisphenolate. Isotope labeling studies and variable temperature kinetics measurements were used to investigate the mechanisms of these transformations. Group 4 complexes supported by the present bisphenolates were found to have interesting catalytic behavior for the propylene polymerization and oligomerization, upon activation with excess MAO. The propylene polymerization activity of present zirconium complexes is excellent, exceeding 106 g polypropylene / (mol Zr • h), in some cases.
Chapter 7 presents the synthesis and study of group 3 dialkyl complexes supported by tetradentate L2N-phenolates (L = S, N, O). These complexes were found to undergo a non-dissociative ligand exchange process in solution. The mechanism of this process was studied by using variable temperature NMR spectroscopy. | 2,007 | 0 | null | [
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} | https://www.semanticscholar.org/paper/00f5a079471ff0c7ff1051c35879810ea39dd135 | Synthesis of submicrometer zirconium carbide formed from inorganic–organic hybrid precursor pyrolysis | null | Journal of Sol-Gel Science and Technology | 2,012 | 25 | null | [
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00f82ab31f7133b7f33c55d630c97b69fc673fe3 | {
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} | null | https://www.semanticscholar.org/paper/00f82ab31f7133b7f33c55d630c97b69fc673fe3 | Synthesis and Thin Film Assembly of Copper Nanoparticles for Sensing Contaminants in Aircraft Cabins | Abstract : Nanoparticle-structured thin films with tunable electronic properties provide an advanced solution for the design of chemical sensing materials. The exploitation of such sensing nanomaterials for chemical sensors in monitoring aircraft cabin contaminants requires the ability to fine tune the nanostructure in terms of size, shape, composition, spacing, functionality, and stability. This report describes the findings of an investigation that developed a method to synthesize cooper nanoparticles of controlled size and surface properties and a process to assemble the nanoparticles into chemiresistive sensing thin films. The approach involved the manipulation of temperature in the synthesis of monolayer-capped copper nanoparticles and the interparticle binding chemistry for a controlled thin film assembly. The chemiresistive sensing properties of the nanostructured thin films were demonstrated in response to a volatile organic compound (benzene) and a toxic gas (carbon monoxide). These findings constitute the basis for the synthesis and assembly of a variety of copper nanoparticle-based advanced sensing materials. | 2,008 | 2 | null | [
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},
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"name": "Peter N. Njoki"
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"name": "Lingyan Wang"
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{
"authorId": "143604923",
"name": "Jin Luo"
},
{
"authorId": "2817140",
"name": "G. Miller"
}
] | null | null | 189 |
|
00fb079e64cd3dcca68ca7e052a497ee0cdc1859 | {
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"alternate_names": [
"Int J Geomate",
"International Journal of Geomate",
"Int J GEOMATE",
"International journal of GEOMATE : geotechnique, construction materials and environment",
"Int j GEOMATE geotech constr mater environ"
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} | https://www.semanticscholar.org/paper/00fb079e64cd3dcca68ca7e052a497ee0cdc1859 | CRYSTAL STRUCTURE AND MAGNETIC PROPERTIES OF NANOPARTICLES BSCNGCO SUPERCONDUCTORS AT ROOM - TEMPERATURE | Synthesis of nano-particles Bi2Sr2(Ca1,5Nd0,25Gd0,25)Cu3Oz (BSCNGCO) superconductors has been successfully done by the wet mixing method. The aim of the study was to produce nanoparticles of BSCNGCO superconductors and study magnetic properties at room temperature. In this research, the raw material used in the formation of BSCNGCO superconductors is Bi2O3 (99.9%), SrCO3 (99.9%), CaCO3 (99.9%), CuO (99.9%), Nd2O3 (99.9%) and Gd2O3 (99.9%). The synthesis process was conducted by added with HNO3 and mixing by a magnetic stirrer to obtain a homogeneous solution, then continued with the calcination process at 450oC for 2 hours and 600oC for 1 hour. The sintering process is done at 830oC with a variation of time, that is 10, 20 and 30 minutes. The result of XRD characterization is dominated by BSCNGCO with 2223 phases and BSCNGCO with 2212 phases, but there are still impurities in each sample such as Bi2CuO4 and Bi2O2.7. The addition of sintering time in 10, 20 and 30 minutes resulted in the addition of fractional volume values of BSCNGCO with 2223 phases, respectively 42.39%, 47.85%, and 49.42%. In contrast, the fraction of the phase volume of impurities (Bi2CuO4, BSCNGCO with 2212 phases, Bi2O2,7) decreases with the addition of sintering time. From the results of TEM morphology and calculations using the Scherrer equation, we can determine the particle size of sample superconductors. The addition of sintering time in 10, 20 and 30 minutes resulted in increased particle size, respectively 25.61 nm, 26.10 nm and 30.08 based on calculations using the Sherrer equation. While the calculations using the ImageJ program of the TEM results of 0.2 nm and 0.5 nm, for the sintering time of 10 and 20 minutes respectively. The results of the VSM characterization of the sample exhibit ferromagnetic properties at room temperature. The addition of sintering time causes the saturation magnetization (Ms), a remanent magnetization (Mr) and coercive force (Hc) values to decrease. Samples of superconductors with sintering time of 10 and 20 minutes showed Ms values of 0.155 emu/g and 0.157 emu/g, Mr values of 0.012 emu/g and 0.011 emu/g, Hc values of 528.623 Oe and 473.327 Oe, respectively. | International Journal of GEOMATE | 2,018 | 0 | null | [
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"name": "Iam Sudarmini"
}
] | null | null | 190 |
00fd42a697e70ce3fdea2d9b4ca15cd5998c235d | {
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} | https://www.semanticscholar.org/paper/00fd42a697e70ce3fdea2d9b4ca15cd5998c235d | Synthesis and Basic Properties of Ferroelectric Thin Films. Methods Materials and Novel Applications | The present study is devoted to synthesis and investigation of basic properties of ferroelectric thin films. The radio frequency sputtering method was utilized to grow Pb(Zr<sub>1.x</sub>Ti<sub>x</sub>)O<sub>3</sub> -based ferroelectric thin films (PZT) whereas the sol-gel-type chemical solution deposition method was used for preparation of Bi<sub>4</sub>Ti<sub>3</sub>O<sub>12</sub> (BTO) and (Ba<sub>0.6</sub>Sr<sub>0.4</sub>)TiO<sub>3</sub> (BST) thin films. The thin films were characterized in terms of their microstructure, crystalline structure, chemical composition and dielectric properties. Complex impedance spectroscopy was used to measure frequency-dependent dielectric properties of the thin films. Great application potential of the ferroelectric thin films was considered especially as active elements of the piezoelectric sensors (PZT), UV-radiation detectors (BTO) and tunable microwave devices (BST). | International Conference on Microwaves, Radar & Wireless Communications | 2,006 | 2 | null | [
{
"authorId": "6556372",
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},
{
"authorId": "2082907308",
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},
{
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00fd993ac4175e8c82f68d3e2ffeeed63a34a136 | {
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} | https://www.semanticscholar.org/paper/00fd993ac4175e8c82f68d3e2ffeeed63a34a136 | Synthesis, structure, and optical properties of Pt(II) and Pd(II) complexes with oxazolyl- and pyridyl-functionalized DPPM-type ligands: a combined experimental and theoretical study. | New square-planar complexes [Pt(1(-H))2] (2a) [1(-H) = (oxazolin-2-yl)bis(diphenylphosphino)methanide] and [Pd(1(-H))2] (2b), of general formula [M{(Ph2P)2C---C---NCH2CH2O}2] (M = Pt, 2a; M = Pd, 2b), result from deprotonation of 2-{bis(diphenylphosphino)methyl}oxazoline (1) at the PCHP site. The new, functionalized dppm-type ligand 4-{bis(diphenylphosphino)methyl}pyridine, (Ph2P)2CH(4-C5H4N) (4), was prepared by double lithiation and phosphorylation of 4-picoline. In the presence of NEt3, the reactions of 2 equiv of 4 with [PtCl2(NCPh)2] and [Pd(acac)2] (acac = acetylacetonate) afforded [Pt(4(-H))2] (5a) [4(-H) = bis(diphenylphosphino)(pyridin-4-yl)methanide] and [Pd(4(-H))2] (5b), of general formula [M{(Ph2P)2C(4-C5H4N)}2] (M = Pt, 5a; M = Pd, 5b), respectively. In the absence of base, the reactions of 2 equiv of 4 with [PtCl2(NCPh)2] and [PdCl2(NCPh)2] afforded (5a·2HCl) (6a) and (5b·2HCl) (6b), respectively, in which the PCHP proton of 4 has migrated from carbon to nitrogen to give a pyridinium derivative of general formula [M{(Ph2P)2C(4-C5H4NH)}2]Cl2 (M = Pt, 6a; M = Pd, 6b). The complexes 3a, 5a·2MeOH, and 6b·4CH2Cl2 have been structurally characterized by X-ray diffraction. The absorption/emission properties of the Pt(II) complexes 2a and 5a and the Pd(II) complexes 2b and 5b have been investigated by UV-vis spectroscopy and theoretical analysis based on density functional theory. The UV-vis absorption spectra of the neutral complexes recorded in dilute N,N'-dimethylformamide solutions are dominated by intense spin-allowed intraligand transitions in the region below 350 nm. The complexes exhibit charge-transfer bands between 350 and 500 nm. The experimental and theoretical absorption spectra agree qualitatively and point to two low-lying ligand-to-metal charge transfer states that contribute to the bands observed between 350 and 500 nm. The complexes are emissive in frozen solutions at 77 K, in the pure solid state, and when doped into films of poly(methyl methacrylate) but are nonemissive in solution. A red shift is observed when Pt(II) is replaced by Pd(II). | Inorganic Chemistry | 2,014 | 5 | null | [
{
"authorId": "2108431764",
"name": "Shuanming Zhang"
},
{
"authorId": "9816314",
"name": "Roberto Pattacini"
},
{
"authorId": "3744718",
"name": "P. Braunstein"
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"name": "L. De Cola"
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"name": "Edward A. Plummer"
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"authorId": "2273733",
"name": "C. Gourlaouen"
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{
"authorId": "145661409",
"name": "C. Daniel"
}
] | null | null | 192 |
00ff53ac482cca34663a8eb888b18ed640ff67bb | {
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} | null | https://www.semanticscholar.org/paper/00ff53ac482cca34663a8eb888b18ed640ff67bb | Large-Scale Synthesis of Metal Nanocrystals in Aqueous Suspensions | Fundamental studies and practical use of metal nanoparticles (NPs) frequently depend on the ability to reproducibly synthesize large quantities of shape-specific NPs. For this reason, facile synthetic procedures are desired that will lead to large quantities of uniformly sized metal NPs exhibiting specific shapes. Here, we report a general approach to the large-scale synthesis of noble metal nanocrystals having well-defined shapes and a narrow size distribution. This method utilizes seed-mediated NP growth in aqueous suspensions of cationic surfactants and metal salts. It leads to a ∼60-fold increase in NP volumetric production capacity, compared to the most widely used solution-based synthetic methods. In addition, it uses up to 100 times less cationic surfactant than conventional solution-based methods. The applicability of the method is demonstrated in the synthesis of Pd nanocubes, rhombic dodecahedra, and polyhedrons with low index facets; branched Pd nanocrystals; alloy Pt/Pd nanocubes; Ag nanocubes... | 2,016 | 34 | null | [
{
"authorId": "1381515424",
"name": "A. Klinkova"
},
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"authorId": "5340780",
"name": "E. Larin"
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"authorId": "153716928",
"name": "Elisabeth Prince"
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"authorId": "1799992",
"name": "E. Sargent"
},
{
"authorId": "46288374",
"name": "E. Kumacheva"
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] | null | null | 193 |
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01013eed8707eae3d83134d62b04b0c8c80523dd | {
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} | null | https://www.semanticscholar.org/paper/01013eed8707eae3d83134d62b04b0c8c80523dd | Fate, Transport, and Removal of Engineered Nanomaterials in the Aquatic Environment | The overall goal of this research was to identify the mechanisms involved in the fate, transport, and removal of nanomaterials in both natural and engineered systems. The project was developed based upon the hypothesis that nanomaterial properties (type, size, shape) and environmental parameters including solution chemistry (pH, ionic strength, and ion valence), as well as the presence of natural organic matter (NOM) and bacteria will control the transport and removal of nanomaterials. Nine different nanomaterials were used including three metal oxides, three sizes of TiO2 and three types of single walled carbon nanotubes(SWNTs). Wide variation in physicochemical properties among these nanomaterials allowed the comparison with respect to size, shape, type, and synthesis method. Complementary transport studies were conducted in both macroscopic (column) and microscopic (flow cells) systems. This dissertation work has allowed for the following critical observations to be made. Sonication, nanoparticle concentration and solution chemistry can significantly alter physicochemical properties of metal oxide nanoparticles to ensure reproducible dispersion of metal oxide nanoparticles for transport and toxicity studies. Transport of TiO2 nanoparticles (TNPs) through macroscopic porous media showed that a combination of mechanisms including straining, blocking, DLVO and hydrodynamic forces were involved. Additionally experiments in the parallel plate chamber indicated that deposition of TNPs was controlled by a combination of DLVO and non-DLVO-type forces, aggregation, shear and gravitational forces. Also, the presence of both NOM and bacteria resulted in much less deposition than NOM or bacteria alone, indicating a combination of factors involved in deposition including electrosteric, electrostatic effects, and aggregation state of TNPs and TNP-bacteria. Another study with three distinctly sized TNPs revealed that heterogeneity in the nanoparticle aggregate - due to its composition of primary nanoparticles - plays a significant role in the transport and aggregate breakup. Finally, SWNTs synthesized by different methods resulted in distinctive breakthrough curves due to catalysts used in synthesis, whereas metal content of SWNTs affects the relative elution of SWNTs through column. This collection of studies suggests that consideration of these mechanisms is necessary to improve our ability to predict fate, transport and removal nanomaterials in the aquatic environments as well as set-up environmental regulations. | 2,012 | 0 | null | [
{
"authorId": "31475223",
"name": "I. Chowdhury"
}
] | null | null | 194 |
|
010685292a59a65a5a424b96e4d32db1a02aa31d | {
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} | null | https://www.semanticscholar.org/paper/010685292a59a65a5a424b96e4d32db1a02aa31d | POS-PVA (POLYSILOSANE-POLYVINYL ALCO- HOL) DISCS: A NEW COMPATIBLE POLYMER FOR IMMOBILIZATION OF IMMUNOLOGIC BIOMOLECULES | Our laboratories developed an easy and efficient method to prepare a semi-interpenetrated polymer network based on polysiloxane and polyvinyl alcohol composite, named POS-PVA disc, through the alkoxide sol-gel process and was tested as solid–phase in immunoassays. Were designed two analysis models: POS-PVA-antigen and POS-PVA-antibody. Both (antigen and antibody) were covalently immobilized onto POS-PVA discs with glutaraldehyde and tested as immunosensor for sera analysis. POS-PVA presented a maximum protein loading capacity of approximately 210μg/disc. Under those conditions, ELISA using POS-PVA discs showed to be applicable to human proteins detection. These results demonstrated that POS-PVA composite could be used as matrix support to antigen (Chagas’ disease) and antibody (neoplasic disease) covalent immobilization through simple steps. Our group showed that intact antibodies and antigen can be remaining active within a sol-gel-derived composite. Thus, it’s easy synthesis and low cost are important advantages for possible routine applications in clinical analysis. INTRODUCTION Reports on chemical immobilization of proteins and enzymes first appeared in the 1960s. Since then, immobilized proteins have been widely used in processing of variety of products and increasingly used in the field biomedical1. In the past few years there has been a significant increase in the number of reports describing the encapsulation of biological components into inorganic silicate matrices formed by the sol-gel processing method2. A very large percentage of modern immunoassays involve the use of synthetic solid phases to immobilize one of the reactants, mainly antigens3. In our laboratories, several supports have been proposed for biomolecules immobilization: Dacron4; ferromagnetic Dacron5; polyvinyl alcohol-glutaraldehyde network6; polyaniline-Dacron composite7; plasticized filter paper with polyvinyl alcohol-glutaraldehyde8. Here, antigen (obtained from Trypanossoma cruzi) and antibody (human IgG anti-S100 protein) were covalently immobilized onto a hybrid inorganic-organic composite made of polysiloxane and polyvinyl alcohol and used for ELISA. Its two conditions of immobilization were used as models to test its feasibility. MATERIALS AND METHODS POS-PVA discs were synthesized as follows: 6 ml of 2% w/v polyvinyl alcohol (MW 72000; Reagen), 5 ml of ethanol (Merck) and 5 ml of tetraethylorthosilicate (Merck) were mixed in a beaker. After raising the temperature to 60oC, under stirring, 100 μl of 1M HCl were added and incubation lasted for 1 h. Then the solution was distributed into Terazaki style microplates (10μl/well) and allowed to solidify for about 24 h. approximately five hundred beads are synthesized under these circumstances. For POS-PVA-antigen system, an antigen preparation containing 800 μg/ml of protein, obtained from T. cruzi. The POS-PVA discs were transferred to 96-wells tissue culture plates and activated by incubation with 2.5% w/v glutaraldehyde (100 μl), prepared in 0.1M H2SO4, for 1 h at 25oC. After washing with deionized water (3 x 200 μl), the beads were incubated overnight at 4oC with the antigenic solution (100 μl), prepared in PBS. The discs containing the covalently immobilized antigen were then washed twice with PBS containing 0.05% w/v Tween 20 (PBS/Tween; Sigma), blocked with 3% w/v BSA (Sigma) in PBS at 25oC for 1 h and washed once with PBS/ Tween. For POS-PVA-antibody system, the discs (7 discs, 10 mg) were incubated with 2.5% glutaraldehyde (100 μl) 1. Laboratório de Imunopatologia Keizo Asami LIKA/UFPE, Brazil; 2. Programa de Pós-graduação em Patologia, CCS/UFPE, Brazil; 3. Departamento de Bioquímica CCB/UFPE, Brazil. Experimental Pathology and Health Sciences 42 and 0.1 M H2SO4 (900 μl) for 2h under stirring at 25oC. Activated discs were incubated with 1 ml of anti-S100 or anti-Galectin-1 non-marked antibody (DAKO, USA) for 18 h under stirring at 4o C. Experiment to evaluate the protein loading capacity of the POS-PVA discs was carried out by incubating 100 mg of glutaraldehyde activated beads with 1 ml of antibody and antigen solutions containing from 1.15 to 100 and 1.0 to 140 μg/mg of support, respectively. The fixed protein was evaluated indirectly by measuring the difference between the amount of protein offered and that present in the washings. | 2,016 | 0 | null | [
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"name": "L. A. Mello"
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"name": "Josélio Soares de Oliveira Filho"
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"name": "Ana"
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"name": "MELO-JUNIOR"
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{
"authorId": "145013639",
"name": "L. Carvalho"
}
] | null | null | 195 |
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0107f3526f11bcb8b638283564e56fa4823cd548 | {
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} | null | https://www.semanticscholar.org/paper/0107f3526f11bcb8b638283564e56fa4823cd548 | Synthesis,Structure Characterization and Thermochemistry of Pyridine-2,6-dicarboxylic Acid Potassium Hydrogen | Pyridine-2,6-dicarboxylic acid potassium hydrogen(KHDPC) was synthesized and its crystal structure was determined by single crystal X-ray diffraction.Low-temperature heat capacities of the compound were measured with an automated adiabatic calorimeter over the temperature range from 78 K to 360 K.Experimental heat capacities were fitted by least-squares method and a polynomial equation of heat capacities vs.reduced temperature was obtained.The smoothed molar heat capacities and thermodynamic functions of the compound relative to the standard reference temperature 298.15 K were calculated based on the fitted polynomial equation.A reasonable thermochemical cycle was designed on the basis of a designed reaction of the substance,and standard molar enthalpies of dissolution for the reactants and products of the supposed reaction in the selected solvents were measured by an isoperibol solution-reaction calorimeter,respectively.Eventually,standard molar enthalpy of formation of the compound was derived to be-(1052.69±1.52) kJ/mol by Hess thermochemical cycle. | 2,012 | 0 | null | [
{
"authorId": "92601694",
"name": "Z. Wen"
}
] | null | null | 196 |
|
010b08c20f6c1b701916c7755a605211a2b9c167 | {
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} | null | https://www.semanticscholar.org/paper/010b08c20f6c1b701916c7755a605211a2b9c167 | Polymeric Nanocarriers for Treatment of Melanoma and Genetically Modified Mesenchymal Stem Cells to Improve Outcome of Islet Transplantation | Melanoma is a lethal malignancy with limited treatment options for advanced metastatic stages. New targeted therapeutic options with discovery of BRAF and MEK inhibitors have shown significant survival benefit. Despite the recent progress, inefficient tumor accumulation and dose limiting systemic toxicity remains pressing challenges for treating metastatic melanoma and there is a need for drug delivery approach to improve therapeutic index of chemotherapeutics. Nanoparticle based drug delivery represents promising approach to enhance efficacy and reduce the dose limiting systemic toxicity. Nanoparticles can be formulated either by physical encapsulation of drugs or by covalent conjugation of drugs to the polymeric backbone. Nanoparticles based strategies for encapsulation and conjugation of drugs to the polymer was reviewed in Chapter 2 where we summarized non-covalent interactions between polymer backbone and drug for physical encapsulation, various polymeric backbones for drug conjugation and application of photodynamic therapy in melanoma. Phototherapy, a light activated treatment modality is a potential therapeutic option for treatment of melanoma. Excitation of photosensitizer by light of specific wavelength can be clinically utilized for fluorescence assisted tumor surgery, photoacoustic imaging, photochemical internalization and phototherapy. Indocyanine green, water soluble FDA approved anionic tricarbocyanine with excellent safety profile and absorption in the near infrared (NIR) range is an excellent photosensitizer. However, short half-life (2-4 minutes) and limited extravascular distribution restricts PT application of ICG. In chapter 3, we have described ICG based phototherapy wherein plasma circulation and tumor accumulation of ICG was improved by designing its micelles formulation. ICG micelles were formulated by covalently conjugating ICG-NH2 to the pendant carboxyl groups of poly (ethylene glycol)-block-poly(2methyl-2-carboxyl-propylene carbonate) (PEGPCC) copolymer using carbodiimide coupling. ICG conjugated amphiphillic polymer selfassembled into micelles with particle size of 30-50 nm and high drug loading. These ICG conjugated micelles exhibited significant in vitro photodynamic cytotoxicity. Use of sodium azide and NIR radiation at 4° C revealed photodynamic and photothermal as primary mechanism of cytotoxicity of ICG solution and ICG conjugated micelles respectively. In vivo NIR imaging demonstrated ICG conjugated micelles prolonged ICG circulation and increased its tumor accumulation through enhanced permeability and retention effect Increase in tumor accumulation improved therapeutic efficacy with complete tumor regression in NIR irradiated ICG conjugated micelles compared to free ICG and control in A375 human melanoma tumor model in athymic nude mice. These results suggest that ICG conjugated micelles can be potentially utilized for phototherapy. Clinical translation of tubulin inhibitors for treating melanoma is limited by multidrug efflux transporters, poor aqueous solubility, and dose-limiting peripheral toxicities. Tubulin inhibitors with efficacy in taxane-resistant cancers are promising drug candidates and can be used as single agent or in conjunction with other chemotherapy. In chapter 4, we describe synthesis of tubulin inhibitors with activity in taxane resistant cell lines with IC50 in nanomolar range for the treatment of metastatic melanoma. LY293, a 5 indole derivative analog, binds to colchicine binding site and does not exhibit clinically prevalent drug resistance mechanism such as multidrug resistance (MDR) protein, breast cancer resistance protein (BCRP) and P-glycoprotein (P-gp). Since LY293 is poorly soluble in water, LY293 was formulated as polymeric nanoparticles for systemic therapy of melanoma. Methoxy polyethylene glycol-b-poly (carbonate-colactide) (mPEG-b-P (CB-co-LA)) random copolymer was synthesized and characterized by H NMR and gel permeation chromatography (GPC). Polymeric nanoparticles were formulated using o/w emulsification method with a mean particle size of 150 nm and loading efficiency of 7.40%. Treatment with LY293 loaded nanoparticles effectively inhibited the proliferation of melanoma cells in vitro and exhibited concentration dependent cell cycle arrest in G2/M phase. In vivo, LY293 loaded nanoparticles significantly inhibited the proliferation of highly aggressive metastasized melanoma in a syngeneic lung metastasis melanoma mouse model without toxicity to vital organs. Islet transplantation has been performed in many patients especially undergoing kidney transplantation to treat Type I diabetes. Proportion of recipients who achieved insulin independence is low and is limited by long-term graft rejection and by primary non-function of islets. Primary non-function is characterized as the loss of islet viability and function caused by non-immune reasons, such as the disruption of islet microvasculature and apoptosis of islets due to production of inflammatory cytokines at the transplantation sites. In chapter 5, we studied the potential of human bone marrow derived mesenchymal stem cells (hBMSCs) as gene carriers for improving the outcome of human islet transplantation. hBMSCs were transduced with Adv-hVEGF-hIL-1Ra to overexpress human vascular endothelial growth factor (hVEGF) and human interleukin1 receptor antagonist (hIL-1Ra). Viability of human islets co-cultured with hBMSCs was determined by membrane fluorescent method and glucose stimulation test. Transduced hBMSCs and human islets were co-transplanted under the kidney capsule of NOD.Cg-Prkdc Il2rg/SzJ diabetic mice and blood glucose levels were measured over time to evaluate the efficacy of genetically modified hBMSCs. Our in vitro and in vivo results showed hBMSCs can be used as gene delivery vehicles to improve the outcome of islet transplantation without affecting their stemness and differentiation potential. | 2,015 | 0 | null | [
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] | null | null | 197 |
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"DOI": "10.1002/EJOC.201900211",
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} | {
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"0947-3440",
"0075-4617",
"0170-2041"
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"Justus Liebig s Annalen der Chemie",
"Eur J Org Chem",
"Liebigs Annalen der Chemie",
"Liebigs Ann Chem",
"Liebigs Annalen",
"Justus Liebig s Ann Chem",
"Ann Pharm",
"Liebigs Ann",
"European Journal of Organic Chemistry"
],
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"http://onlinelibrary.wiley.com/journal/10.1002/%28ISSN%291099-0690",
"https://onlinelibrary.wiley.com/journal/10990690",
"http://www.wiley-vch.de/publish/en/journals/alphabeticIndex/2046/"
],
"id": "6dae4194-013c-4529-b079-d0329099c8c0",
"issn": "0365-5490",
"name": "Annalen der Pharmacie",
"type": "journal",
"url": "http://onlinelibrary.wiley.com/journal/10.1002/(ISSN)1099-0690"
} | https://www.semanticscholar.org/paper/010b1a22b49e35c3fa11b7374b973b98e3b9bf83 | New Geometries for Calix[6]arene-Based Rotaxanes | Understanding the role played by the nature, number and arrangement of binding sites anchored to a macrocycle remains a topic of current interest for the synthesis of new interwoven species. We report the synthesis and detailed structural characterisation of a new calix[6]arene derivative decorated with two phenylureido groups anchored at the diametrical position of the calix upper rim that adopts a 1,2,3-alternate conformation in solution and in the solid state. Preliminary data on the ability of this host to form redox-active pseudorotaxanes and rotaxanes are reported. | Annalen der Pharmacie | 2,019 | 9 | {
"status": "GREEN",
"url": "https://cris.unibo.it/bitstream/11585/684012/1/Rotaxanes_issue_EuJOC_2019.pdf"
} | [
{
"authorId": "41124521",
"name": "Margherita Bazzoni"
},
{
"authorId": "3560350",
"name": "V. Zanichelli"
},
{
"authorId": "33854469",
"name": "Lorenzo Casimiro"
},
{
"authorId": "6115285",
"name": "C. Massera"
},
{
"authorId": "1924425",
"name": "A. Credi"
},
{
"authorId": "10686092",
"name": "A. Secchi"
},
{
"authorId": "2741935",
"name": "S. Silvi"
},
{
"authorId": "4319538",
"name": "A. Arduini"
}
] | https://cris.unibo.it/bitstream/11585/684012/1/Rotaxanes_issue_EuJOC_2019.pdf | cris.unibo.it | 198 |
010eda05a3715565356db5c0fde95a7161f6ade8 | {
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"ArXiv": null,
"CorpusId": 43051518,
"DBLP": null,
"DOI": "10.1039/c0dt00587h",
"MAG": "2029416698",
"PubMed": "20820617",
"PubMedCentral": null
} | {
"alternate_issns": null,
"alternate_names": [
"T Trans"
],
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"https://pubs.rsc.org/en/journals/journalissues/dt"
],
"id": "9b4a9fc0-359f-4001-81bb-a1450dff3c6e",
"issn": "1477-9226",
"name": "Dalton Transactions",
"type": "journal",
"url": "http://www.rsc.org/Publishing/Journals/dt/index.asp"
} | https://www.semanticscholar.org/paper/010eda05a3715565356db5c0fde95a7161f6ade8 | Assembly of the heterometallic Au(I)-M(I) (M = Cu, Ag) clusters containing the dialkyne-derived diphosphines: synthesis, luminescence and theoretical studies. | The novel heterobimetallic Au(I)-M(I) (M = Cu, Ag) alkynyl-diphosphine clusters were effectively prepared using a family of dialkynyl-based diphosphines, PPh(2)-C(2)-(C(6)H(4))(n)-C(2)-PPh(2) (n = 0-2). These compounds consist of [Au(x)M(y)(C(2)C(6)H(4)R)(2x)](y-x) clusters (x = (n + 2)(n + 3)/2; y = (n + 1)(n + 2)) "wrapped" in gold-diphosphine "belts" (M = Cu, n = 0, R = H (4); n = 1, R = H (6), OMe (8), NMe(2) (9). M = Ag, n = 0, 1, 2, R = H (5, 7, 10). The solid-state structures of 5 and 6 have been determined by X-ray crystallographic studies, other complexes were characterized by NMR spectroscopy and ESI-MS measurements. The luminescence behavior of these compounds has been studied both in the solid state and solution, and intense room-temperature emission in fluid medium with maximum quantum yield of 0.5 (6) was detected. Computational studies have been carried out and the theoretical results obtained are in good agreement with the experimental data. The calculations provided additional information on the structural and electronic properties of the aggregates under investigation and allowed for the rationalization of the difference in their photophysical behavior. | Dalton Transactions | 2,010 | 30 | null | [
{
"authorId": "4111055",
"name": "I. Koshevoy"
},
{
"authorId": "16292292",
"name": "Polina V Ostrova"
},
{
"authorId": "2239652",
"name": "A. Karttunen"
},
{
"authorId": "10344677",
"name": "A. Melnikov"
},
{
"authorId": "11269582",
"name": "M. Khodorkovskiy"
},
{
"authorId": "4190894",
"name": "M. Haukka"
},
{
"authorId": "4451223",
"name": "J. Jänis"
},
{
"authorId": "5741984",
"name": "S. Tunik"
},
{
"authorId": "145309494",
"name": "T. Pakkanen"
}
] | null | null | 199 |
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