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Phys. Rev. Lett. 96, 206102 (2006) [4 pages]

Crystal Bridge Formation Marks the Transition to Rigidity in a Thin Lubrication Film

A. Jabbarzadeh,1 Peter Harrowell,2 and R. I. Tanner1
1School of Aerospace, Mechanical and Mechatronic Engineering, University of Sydney, Sydney, New South Wales 2006, Australia
2School of Chemistry, University of Sydney, Sydney, New South Wales 2006, Australia

Received 22 February 2006; published 26 May 2006

We report that the rheological transition in a thin lubrication film of dodecane from bulk to high viscosity states as the thickness is decreased is the result of a novel structural transition. Using nonequilibrium molecular dynamics simulations we find that the initial increase in viscosity as the film thins is due to the formation of isolated crystalline bridges between the surfaces. As the thickness decreases further, these bridges increase in number and organize themselves into a tetratic order in the plane of the surface. We show that this ordered state melts at a temperature of 350 K.

©2006 The American Physical Society

URL: http://link.aps.org/doi/10.1103/PhysRevLett.96.206102
DOI: 10.1103/PhysRevLett.96.206102
PACS: 68.35.Af; 81.40.Pq
  • 68.35.Af
    Atomic scale friction (solid surfaces/interfaces)
  • 81.40.Pq
    Friction, lubrication, and wear
  • YEAR: 2006
KEYWORDS: liquid films, shear modulus, viscosity, organic compounds, rheology

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