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Abstract

Mixed metal oxides are synthesized from corresponding oxides and are used as pigments in paints which constitutes the Nanoformulated paints. The behavioural studies of these Nanoformulated paints are investigated in various aspects. The studies show better hiding power and enhanced glossiness. Nanoformulated paint coatings are done on mild steel plate and the coatings were tested in corrosion atmosphere. The results of corrosion tests were compared with commercially available red and white paint. Also the corrosion behaviour was studied for TiO2 and Fe2O3 formulated paint along with TiO2.Fe2O3. The mixed metal oxides TiO2.Fe2O3 shows better corrosion inhibition efficiency. The particle size of the prepared oxide nanoparticles are confirmed with SEM. The structural and functional purity of the oxides were confirmed with XRD and FTIR respectively. Furthermore the studies were extended by evaluating the photocatalytic behaviour of the prepared oxides. It is found that upon UV irradiation on the dye the photocatalytic degradation was significantly increased. This studies confirms that incorporation of these nanoparticles in paints enhances the photocatalytic activity which results in the reduction of volatile organic compounds

Keywords

INTRODUCTION

Nanotechnology is the science of developing
materials by controlling the individual atoms and
molecules to create devices that are thousand times smaller
than the current technology. They are the structures
between 1nm and 100 nm in size. They achieve ethical challenges. It has been applied to many areas of study
including electronic engineering, physical sciences,
biomedical sciences and many others. Most paints include
at least four groups of components: binders, volatile
substances, pigments, and additives. In order to increase
the efficiency of TiO2 for photocatalytic activity is
proposed to use mixed metal oxides to enhance
photocatalytic behavior. The oxides such as Fe2O3 was
doped with TiO2 to form mixed metal oxides such as
Fe2O3.TiO2. These nanoparticles are incorporated into
paints to enhance the photocatalytic behavior hence reducing the volatile organic compounds contained in
them. Furthermore, glossiness, hiding power and
anticorrosion behavior are determined.

II.MATERIALS AND METHODS

2.1 Preparation of Metal Oxide Nanoparticles

The metal oxides such as TiO2, ZnO, NiO,
Fe2O3are prepared by SOL-GEL process. A colloidal
suspension or a sol is formed due to hydrolysis and
polymerization reaction of the precursors, which on
complete polymerization and loss of solvent leads to the
transition from liquid sol into a solid sol phase

2.2 Preparation of Mixed Metal oxide Nanoparticles

The prepared metal oxides are taken individually
in a beaker and distilled water is added. Based on their
combination such as TiO2.Fe2O3 two metal oxides are
taken combined, heated in a hot plate at 60°C.Then it is
washed, filtered and dried.

2.3 Preparation of Nanoformulated based paints

The paints are synthesized by mixing the
composition of pigment, resin, solvent and additives in a
equal proportion

2.4 Gloss Test

Gloss test is required to ensure uniformity of the
surface finish. The gloss value is determined by directing a
light, at the test surface and measuring the amount of
specular reflection. Gloss is measured at 60°.

2.5 Hiding Power

Opacity and hiding power measurement was done using
quadruplex film applicator. It act as Multifunctional film
applicator with 4 application sides for applying paintfilms.
It is placed near one end of a flat panel, like a test
chart. A sufficient volume of paint/liquid is placed in front
of the applicator. The applicator is then drawn down in the
chart manually, which leaves a uniform film behind it.

2.6 Anticorrosion Studies

Corrosion is the destructive attack to metal by chemical or
electrochemical reaction with its environment. Mild steel
was easily corroded in acidic medium. To reduce this
problem the corrosion inhibitor coating was done on it. A
corrosion inhibitor is the material which inhibits the
corrosion reaction by providing a protective barrier film
which in turn stops the corrosive reaction. Paint is a
material which prevents the direct contact of corroding
media like air and H2O over the metal surface. It forms a
uniform thin layer after drying and protects the base metal
from the corrosion

2.7 Photocatalytic behaviour studies

The photocatalytic behaviour in paints is studied under UV
light.The photocatalytic degradation is due to absorbance
of the peak. TiO2 is a photocatalyst when it is illuminated
by light of energy higher than its band gap, electrons in
TiO2 will jump from valence band to conduction band and
electrons and holes will form on the surface of the
photocatalyst. The negative electrons and oxygen will
combine to form radical ions whereas positive electric
holes and water will generate hydroxyl radicals OH-Since
both products use unstable chemical entities when the
organic compound falls on surface of photocatalyst it will
combine with O2
- and OH and turns to form CO2 and H2O.

III. CHARACTERISATION STUDIES

3.1 XRD analysis

The structural features of TiO2.Fe2O3 is explored
from XRD data. In Fig 3.1 the XRD pattern of final
powders revealed well developed reflection of TiO2.Fe2O3
nanoparticles (JCPDS.No 89-8104, 89-6975, 89-4920.).

This figure reveals the presence and uniformity of the
distributed particles. It was clear that the particles obtained
were in nano size ranging in the diameter from 150-
200nm.

It represents the 3D AFM images of the TiO2.Fe2O3
coatings. The shape and thickness of the coated particles is
around 80nm and it is uniformly distributed.

IV. EXPERIMENTAL RESULTS

4.1 Glossiness

V. CONCLUSION

Nanoformulated paints such as titanium oxide, iron oxide
and mixed oxides were prepared. The properties for both
nanoformulated paints and commercially available paints
are analysed. Glossiness, SolidContent and Hiding power
of Nanoformulated paints are higher when compared to
commercial paints. Corrosion behaviour is low in
Nanoformulated paints and therefore it has high inhibition
efficiency.

ACKNOWLEDGEMENT

This work was supported by Centre for nanoscience and
Technology, MepcoSchlenk Engineering college, Sivakasi
and Vigneshwara paint company ,Sivakasi.