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Volume 156, 2012
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Physio-chemical hydrodynamic mechanism underlying the formation of thin adsorbed boundary films

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Abstract

The formation of low shear strength surface-adhered thin films mitigates excessive friction in mixed or boundary regimes of lubrication. Tribo-films are formed as a consequence of molecular chemical reactions with the surfaces. The process is best viewed in the context of a lubricant-surface system. Therefore, it is usually surmised that the adsorption of lubricant molecular species to the contact surfaces is underlying to the formation of ultra-thin lubricant films. The paper considers contact between smooth surfaces at close separation. This may be regarded as the contact of a pair of asperity summits, whose dimensions, however small, are far larger than the size of fluid molecules within the conjunction. In such diminishing separations the constraining effect of relatively smooth solid barriers causes oscillatory solvation of fluid molecules. This effect accounts for the conjunctional load capacity but does not contribute to mitigating friction, except when molecular adsorption is taken into account with long chain molecules which tend to inhibit solvation. The paper presents an analytical predictive model based on the Ornstein–Zernike method with the Percus–Yevick approximation of a narrow interaction potential between conjunctional composition. The predictions confirm the above stated physical facts in a fundamental manner.

  • This article is part of the themed collection: Tribology
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Publication details

The article was received on 24 Nov 2011, accepted on 20 Jan 2012 and first published on 23 Jan 2012


Article type: Paper
DOI: 10.1039/C2FD00118G
Citation: Faraday Discuss., 2012,156, 123-136
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    Physio-chemical hydrodynamic mechanism underlying the formation of thin adsorbed boundary films

    W. W. F. Chong, M. Teodorescu and H. Rahnejat, Faraday Discuss., 2012, 156, 123
    DOI: 10.1039/C2FD00118G

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