Thermal conductivity of metallic nanoparticle using surface effect and kapitza resistance

Abstract

To estimate the size dependence of thermal conductivity of metallic nanoparticles, different theoretical models and experimental techniques have been used by different groups of researchers. But it still requires an accurate model that supports the experimental results at low dimensions. A model is proposed to predict the change in thermal conductivity of metallic nanoparticles with size by extending the bond-energy model assuming core shell structure. In present work, we have taken metallic nanoparticles as samples for the verification of proposed model. It is observed that the coefficient of thermal conductivity of nanoparticles decreases by lowering the size of nanoparticles. The variation in thermal conductivity of metallic nanoparticles with their shape and size can be successfully explained by introducing the theory including the surface effect and kapitza resistance. It is found that the computed value has a deviation of maximum ±5% with experimental results which is in the permissible range of experimental measurement.