科研之友
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摘要
A self-consistent statistical method is used to describe thermodynamical properties of free spherical nanocrystals. As shown, the size influence on thermodynamical properties of nanocrystals is caused by size-dependent modification of the vibrational spectrum affecting the parameters of a statistical distribution function of atomic displacements and, thus, governing size dependence of average values of energy contributions to the Gibbs free energy of the system. For Cu and Au nanocrystals, we present calculated size dependences of the Debye temperature, heat capacity, interatomic distance, melting temperature, etc. We show a possibility of reverse heat transfer in a system of nanoparticles, i.e. a 'heat pump'.
- 出版日期2009-4
