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Heating-Rate and Particle-Size Effects on Melting Process of Au Nanoparticles
journal contribution
posted on 2020-03-19, 14:34 authored by Jixing Chen, Xiaofeng Fan, Jialin Liu, Changzhi Gu, Yunfeng Shi, David J. Singh, Weitao ZhengThe
atomic mechanisms of the melting process of gold nanoparticles
were investigated by molecular dynamics simulations. Melting under
a high heating rate is found to be much different from the near equilibrium
melting and is a typical overheating process. The melting begins with
the formation of a premelting layer near the surface, and the interface
of the solid and premelting layer drives the nucleation of the liquid
into the interior of nanoparticles. The high heating rate causes solid–liquid
coexistence in a large temperature interval. These imply that the
melting process can be controlled effectively by different heating
ways.