中国物理B ›› 2008, Vol. 17 ›› Issue (3): 1094-1100.doi: 10.1088/1674-1056/17/3/057

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The spreading behaviour of perfluoropolyether droplets on solid surfaces

郭晓燕, 李欣, 胡元中, 王慧   

  1. State Key Laboratory of Tribology, Tsinghua University, Beijing 100084, China
  • 收稿日期:2007-05-16 修回日期:2007-09-24 出版日期:2008-03-04 发布日期:2008-03-04
  • 基金资助:
    Project supported by the Specialized Research Fund for the Doctoral Program of Higher Education of China (Grant No 20060003025) and the State Key Development Program for Basic Research of China (Grant No 2003CB716201).

The spreading behaviour of perfluoropolyether droplets on solid surfaces

Guo Xiao-Yan(郭晓燕), Li Xin(李欣), Hu Yuan-Zhong(胡元中)†, and Wang Hui(王慧)   

  1. State Key Laboratory of Tribology, Tsinghua University, Beijing 100084, China
  • Received:2007-05-16 Revised:2007-09-24 Online:2008-03-04 Published:2008-03-04
  • Supported by:
    Project supported by the Specialized Research Fund for the Doctoral Program of Higher Education of China (Grant No 20060003025) and the State Key Development Program for Basic Research of China (Grant No 2003CB716201).

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摘要： The spread of perfluoropolyether (PFPE) droplets on solid surfaces has been measured from the top-down view through a microscope system. Effects of substrates, molecular weight and end-group functionality on spreading of the PFPE droplets have been studied experimentally and the results were compared with those by molecular dynamics (MD) simulations. Silicon wafer and diamond-like carbon (DLC) substrates were used to study the effect of substrates on spreading. Two types of PFPE, Z-dol and Z-tetraol, with the same chain structure and various molecular weights (2000 and 4000\,g/mol) were employed in experiments. Effect of molecular weight has been investigated through comparing the spreading of Z-dol 2000 and Z-dol 4000, and it is found that the increase of molecular weight will decrease the mobility of PFPE. Comparison between spreading of Z-dol and Z-tetraol of the same molecular weight proved that functional end group plays a significant role on the spreading of PFPE, which confirmed the MD simulation results.

关键词: perfluoropolyether, spreading, thin lubricant films, hard disk driver

Abstract: The spread of perfluoropolyether (PFPE) droplets on solid surfaces has been measured from the top-down view through a microscope system. Effects of substrates, molecular weight and end-group functionality on spreading of the PFPE droplets have been studied experimentally and the results were compared with those by molecular dynamics (MD) simulations. Silicon wafer and diamond-like carbon (DLC) substrates were used to study the effect of substrates on spreading. Two types of PFPE, Z-dol and Z-tetraol, with the same chain structure and various molecular weights (2000 and 4000 g/mol) were employed in experiments. Effect of molecular weight has been investigated through comparing the spreading of Z-dol 2000 and Z-dol 4000, and it is found that the increase of molecular weight will decrease the mobility of PFPE. Comparison between spreading of Z-dol and Z-tetraol of the same molecular weight proved that functional end group plays a significant role on the spreading of PFPE, which confirmed the MD simulation results.

Key words: perfluoropolyether, spreading, thin lubricant films, hard disk driver

中图分类号:  (Wetting)

  • 68.08.Bc
47.55.dr (Interactions with surfaces) 68.08.De (Liquid-solid interface structure: measurements and simulations)