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Abstract: Molecular dynamics simulation is employed to investigate the relation between the properties of ultra-thin films and their microstructure. Solid-to-liquid ratio is introduced to estimate the solid-like of microstructure. In the process of simulation, the effects of the temperature and the film thickness on the solid-to-liquid ratio and the friction force are investigated. It is concluded that the friction force increases with the solid-to-liquid ratio. But the atomic mass of the solid wall has reverse effects on this phenomenon. It is postulated that the slip length increases with the increase of the atomic mass of the solid wall, which in turn reduces the friction force.
Key words: Ultra-thin film Microstructure
Molecular dynamics simulation
Solid-to-liquid ratio Slip length
CLC No: TH117
国家自然科学基金(50275026)和江苏省自然科学基金(BK2002060)资助项目. Received 20060927, received in revised form 20070531
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