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	Molecular dynamics simulations on atomic friction between self-assembled monolayers: Commensurate and incommensurate sliding
	Hu, Yuan-zhong ; Zhang, Tao ; Ma, Tian-bao ; Wang, Hui
	2010-05-10 ; 2010-05-10
关键词	molecular dynamics simulations atomic-scale friction self-assembled monolayers stick-slip commensurability energy dissipation ORDERED ORGANIC MONOLAYERS FRENKEL-KONTOROVA MODEL WEARLESS FRICTION FORCE MICROSCOPY DEPENDENCE BEHAVIOR LAYERS MICA Materials Science, Multidisciplinary
中文摘要	Atomic friction between self-assembled monolayers (SAMs) on Au(111) has been studied through molecular dynamics simulations, with emphasis on the comparison of the performances of commensurate and incommensurate SAMs in relative sliding. Results show that the shear stress on commensurate SAMs exhibits a clean periodic pattern, manifesting the atomic stick-slip friction, while random fluctuations and a much lower average value of the shear stress are observed for incommensurate sliding. The different frictional behavior can be traced to the difference in molecule movements, especially in the collective nature of the motion. In commensurate sliding, all molecules move synchronously in each period and phase, but they swing randomly and independently for incommensurate monolayers. Simulations provide clear evidence that under the same working conditions friction forces on commensurate SAMs are always higher than those in incommensurate cases. The results also show a linear dependence of shear stress on normal pressure and logarithmic dependence on sliding velocity. (c) 2006 Elsevier B.V. All rights reserved.
语种	英语 ; 英语
出版者	ELSEVIER SCIENCE BV ; AMSTERDAM ; PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS
内容类型	期刊论文
源URL	[http://hdl.handle.net/123456789/25225]
专题	清华大学
推荐引用方式 GB/T 7714	Hu, Yuan-zhong,Zhang, Tao,Ma, Tian-bao,et al. Molecular dynamics simulations on atomic friction between self-assembled monolayers: Commensurate and incommensurate sliding[J],2010, 2010.
APA	Hu, Yuan-zhong,Zhang, Tao,Ma, Tian-bao,&Wang, Hui.(2010).Molecular dynamics simulations on atomic friction between self-assembled monolayers: Commensurate and incommensurate sliding..
MLA	Hu, Yuan-zhong,et al."Molecular dynamics simulations on atomic friction between self-assembled monolayers: Commensurate and incommensurate sliding".(2010).

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