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Low friction lubrication between amorphous walls: Unraveling the contributions of surface roughness and in-plane disorder

J. Chem. Phys. 125, 034703 (2006); doi:10.1063/1.2216695

Published 18 July 2006

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A. Jabbarzadeh
School of Aerospace, Mechanical and Mechatronic Engineering, The University of Sydney, New South Wales 2006, Australia

Peter Harrowell
School of Chemistry, The University of Sydney, New South Wales 2006, Australia

R. I. Tanner
School of Aerospace, Mechanical and Mechatronic Engineering, The University of Sydney, New South Wales 2006, Australia
Using molecular dynamics simulations, we show that dodecane films confined between amorphous surfaces at 300  K retain liquid-like behavior down to film thicknesses of at least 1.8  nm and possibly smaller. This is in stark contrast to the behavior of films confined between crystalline surfaces which show an abrupt transition to a very high viscosity state at a film thickness of 4  nm. We show that it is the small increase in surface roughness in going from crystalline to amorphous walls, rather than the in-plane disorder, that is responsible for disrupting the crystalline bridges found in the crystal-confined films. The main consequences of the in-plane disorder are the removal of the orientational pinning of the local domain alignment and the reduction of the critical thickness at which the transition to film rigidity appears. ©2006 American Institute of Physics
History: Received 20 April 2006; accepted 25 May 2006; published 18 July 2006
Permalink: http://link.aip.org/link/?JCPSA6/125/034703/1
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KEYWORDS and PACS

Keywords
PACS
  • 68.35.Gy
    Mechanical properties and surface strains of solid surfaces and interfaces including adhesion
  • 68.35.Bs
    Structure of clean solid surfaces (reconstruction)
  • 66.20.+d
    Viscosity of liquids; diffusive momentum transport
  • 68.08.De
    Structure: measurements and simulations (liquid-solid interfaces)
  • YEAR: 2006

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PUBLICATION DATA

ISSN:
0021-9606 (print)   1089-7690 (online)
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