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Chinese Physics, 2006, Vol. 15(4): 818-821    DOI: 10.1088/1009-1963/15/4/025
CONDENSED MATTER: ELECTRONIC STRUCTURE, ELECTRICAL, MAGNETIC, AND OPTICAL PROPERTIES Prev   Next  

Molecular dynamic simulation of lubricant spreading: effect from the substrate and endbead

Li Xin (李欣), Hu Yuan-Zhong (胡元中), Wang Hui (王慧), Yang Dong (杨冬)
The State Key Laboratory of Tribology , Tsinghua University, Beijing 100084, China
Abstract  Molecular dynamic simulations based on a coarse-grained, bead-spring model are adopted to investigate the spreading of both nonfunctional and functional perfluoropolyether (PFPE) on solid substrates. For nonfunctional PFPE, the spreading generally exhibits a smooth profile with a precursor film. The spreading profiles on different substrates are compared, which indicate that the bead-substrate interaction has a significant effect on the spreading behaviour, especially on the formation of the precursor film. For functional PFPE, the spreading generally exhibits a complicated terraced profile. The spreading profiles with different endbeads are compared, which indicate that the endbead-substrate interaction and the endbead--endbead interaction, especially the latter, have a significant effect on the spreading behaviour.
Keywords:  perfluoropolyether      molecular dynamic simulation      thin film lubrication      spreading  
Received:  24 November 2005      Revised:  26 December 2005      Accepted manuscript online: 
PACS:  02.70.Ns (Molecular dynamics and particle methods)  
  68.15.+e (Liquid thin films)  
  68.60.Bs (Mechanical and acoustical properties)  
Fund: Project supported by the National Natural Science Foundation of China (Grant No 50390060) and the State Key Development Program for Basic Research of China (Grant No 2003CB716201).

Cite this article: 

Li Xin (李欣), Hu Yuan-Zhong (胡元中), Wang Hui (王慧), Yang Dong (杨冬) Molecular dynamic simulation of lubricant spreading: effect from the substrate and endbead 2006 Chinese Physics 15 818

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