Thermal properties of Ag@Ni core shell nanoparticles
Abstract We synthesized Ag@Ni core shell nanoparticles by the solvothermal hot injection method and characterized them as for their shape and size by dynamic light scattering (DLS) small angle X ray scattering (SAXS) and transmission electron microscopy (TEM) We previously demonstrated their core shell structure by scanning transmission electron microscopy with energy dispersive spectroscopy (STEM EDS) The silver/nickel phase diagram was calculated by the CALPHAD method, and the melting points of 10, 15, and 20 nm silver nanoparticles were predicted at 930.2, 940.7, and 946.0 degC, respectively. We took advantage of the nickel shell to avoid silver sintering and to confirm the calculated melting point depression (MPD) The results obtained from the differential scanning calorimetry (DSC) experiments revealed the melting points of 11 15 nm nanoparticles at 944 949 degC in agreement with calculated values.