Nano-tribology through molecular dynamics simulations |
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Authors: | Wang Hui Hu Yuanzhong Zou Kun and Leng Yongsheng |
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Institution: | The State Key Laboratory of Tribology, Tsinghua University, Beijing 100084, China |
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Abstract: | The solidification and interfacial slip in nanometer-scale lubricating films as well as the contact and adhesion of metal
crystals have been studied via molecular dynamics simulations. Results show that the critical pressure for the solid-liquid
transition declines as the film thickness decreases, indicating that the lubricant in the thin films may exist in a solid-like
state. It is also found that the interfacial slip may occur in thin films at relatively low shear rate, and there is a good
correlation between the slip phenomenon and the lubricant solidification. The simulations reveal that a micro-scale adhesion
may take place due to the atomic jump during the process of approaching or separating of two smooth crystal surfaces, which
provides important information for understanding the origin of interfacial friction. |
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Keywords: | Molecular dynamics simulation Nano-tribology Phase transition in thin films Interfacial sup Micro-scale contact and adhesion |
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