ナノ構造間隔が固体熱伝導低下に及ぼす影響に関する分子動力学的研究(熱工学,内燃機関,動力など)

抄録

In order to elucidate the mechanism of low thermal conductivity caused by nanostructures and nano-structural clearances, we calculated thermal conductivity, phonon dispersion relationships, and density of states in argon and diamond thin film systems depending on nanostructures and nano-structural distances by the classical molecular dynamics simulation. We can observe some change of the group velocity of phonon in the dispersion relations of the longitudinal wave as well as the reduction of thermal conductivity when the nano-structural distance was relatively small. However, the change of the phonon dispersion relations and the density of states are not so large in the systems with nanostructures in comparison with the perfect lattice systems.