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Volume 156, 2012
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On the three-term kinetic friction law in nanotribological systems

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Abstract

A post-processing method, which maps the punctiform atoms in molecular dynamics (MD) simulations of boundary lubrication onto smoothed particles, is used to estimate the asperity contact area defined by the minimum cross-section of the formed solid bridges. It is then shown that this asperity contact area excellently agrees with the projected area resulting from a Voronoi tessellation of the corresponding contact zone, and that it can be applied to compute the constitutive system parameters of a three-term friction law, which is found to hold for any boundary-lubricated nanotribological system. Finally, an attempt is made to relate the load-independent friction offset observed in boundary-lubricated nanotribological systems without solid–solid contact to the structural order as measured by the entropy, which is estimated within the single macromolecule approach based on covariance (super)matrices of the carbon backbone atoms in the lubricant.

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

The article was received on 25 Nov 2011, accepted on 23 Jan 2012 and first published on 23 Jan 2012


Article type: Paper
DOI: 10.1039/C2FD00120A
Citation: Faraday Discuss., 2012,156, 173-196
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    On the three-term kinetic friction law in nanotribological systems

    A. Vernes, S. Eder, G. Vorlaufer and G. Betz, Faraday Discuss., 2012, 156, 173
    DOI: 10.1039/C2FD00120A

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