Stability analysis and molecular simulation of nanoscale lubricant films with chain-end functional groups

被引:22
作者
Izumisawa, S
Jhon, MS [1 ]
机构
[1] Carnegie Mellon Univ, Dept Chem Engn, Pittsburgh, PA 15213 USA
[2] Carnegie Mellon Univ, Ctr Data Storage Syst, Pittsburgh, PA 15213 USA
关键词
D O I
10.1063/1.1456043
中图分类号
O59 [应用物理学];
学科分类号
摘要
In this article, the thermodynamic stability of ultrathin perfluoropolyether (PFPE) films were examined via experimentation and molecular simulation. Using measured surface energies of PFPE films and a virgin carbon overcoat, a mesoscopic model using the Gibbs free energy change of spreading PFPE films was developed, yielding a film stability diagram as a function of film thickness, surface polarity of the carbon overcoat, and molecular weight of the PFPEs. We predict that a lower PFPE molecular weight and a lower surface polarity of the carbon overcoat produce a less stable film. This stability analysis was enhanced with off-lattice Monte Carlo simulations, which were applied for the first time to examine PFPE film nanostructures. The simulation results produced oblate conformations for the PFPE molecules near the surface, layered polar endgroup orientations, and a rougher surface morphology for films with less stable conditions, as predicted by the Gibbs free energy model. (C) 2002 American Institute of Physics.
引用
收藏
页码:7583 / 7585
页数:3
相关论文
共 17 条
  • [1] Stability analysis of ultra-thin lubricant films with chain-end functional groups
    Izumisawa, S
    Jhon, MS
    [J]. TRIBOLOGY LETTERS, 2002, 12 (01) : 75 - 81
  • [2] Water adsorption on thin film media
    Karis, TE
    [J]. JOURNAL OF COLLOID AND INTERFACE SCIENCE, 2000, 225 (01) : 196 - 203
  • [3] Hard disk lubricant conformation and distribution via angle-resolved ESCA
    Karplus, MA
    Waltman, RJ
    Pocker, DJ
    [J]. JOURNAL OF APPLIED PHYSICS, 2000, 87 (09) : 6161 - 6163
  • [4] How disjoining pressure drives the dewetting of a polymer film on a silicon surface
    Kim, HI
    Mate, CM
    Hannibal, KA
    Perry, SS
    [J]. PHYSICAL REVIEW LETTERS, 1999, 82 (17) : 3496 - 3499
  • [5] Monte Carlo simulations of liquid spreading on a solid surface: Effect of end-group functionality
    Ma, X
    Bauer, CL
    Jhon, MS
    Gui, J
    Marchon, B
    [J]. PHYSICAL REVIEW E, 1999, 60 (05): : 5795 - 5801
  • [6] Spreading of perfluoropolyalkylether films on amorphous carbon surfaces
    Ma, X
    Gui, J
    Smoliar, L
    Grannen, K
    Marchon, B
    Jhon, MS
    Bauer, CL
    [J]. JOURNAL OF CHEMICAL PHYSICS, 1999, 110 (06) : 3129 - 3137
  • [7] Complex terraced spreading of perfluoropolyalkylether films on carbon surfaces
    Ma, X
    Gui, J
    Smoliar, L
    Grannen, K
    Marchon, B
    Bauer, CL
    Jhon, MS
    [J]. PHYSICAL REVIEW E, 1999, 59 (01): : 722 - 727
  • [8] POLYMER-CHAINS CONFINED INTO TUBES WITH ATTRACTIVE WALLS - A MONTE-CARLO SIMULATION
    MILCHEV, A
    PAUL, W
    BINDER, K
    [J]. MACROMOLECULAR THEORY AND SIMULATIONS, 1994, 3 (02) : 305 - 323
  • [9] Min BG, 1995, TRIBOL LETT, V1, P225
  • [10] O'Connor TM, 1995, TRIBOL LETT, V1, P219