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Tribology of the lubricant quantized sliding state

J. Chem. Phys. 131, 174711 (2009); doi:10.1063/1.3257738

Published 6 November 2009

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Ivano Eligio Castelli,1 Rosario Capozza,2 Andrea Vanossi,2,3 Giuseppe E. Santoro,3,4 Nicola Manini,1,3 and Erio Tosatti3,4
1Dipartimento di Fisica and CNR-INFM, Università di Milano, Via Celoria 16, 20133 Milano, Italy
2Department of Physics and CNR-INFM National Research Center S3, University of Modena and Reggio Emilia, Via Campi 213/A, 41100 Modena, Italy
3International School for Advanced Studies (SISSA) and CNR-INFM Democritos National Simulation Center, Via Beirut 2-4, I-34014 Trieste, Italy
4International Centre for Theoretical Physics (ICTP), P.O. Box 586, I-34014 Trieste, Italy
In the framework of Langevin dynamics, we demonstrate clear evidence of the peculiar quantized sliding state, previously found in a simple one-dimensional boundary lubricated model [A. Vanossi et al., Phys. Rev. Lett. 97, 056101 (2006)], for a substantially less idealized two-dimensional description of a confined multilayer solid lubricant under shear. This dynamical state, marked by a nontrivial “quantized” ratio of the averaged lubricant center-of-mass velocity to the externally imposed sliding speed, is recovered, and shown to be robust against the effects of thermal fluctuations, quenched disorder in the confining substrates, and over a wide range of loading forces. The lubricant softness, setting the width of the propagating solitonic structures, is found to play a major role in promoting in-registry commensurate regions beneficial to this quantized sliding. By evaluating the force instantaneously exerted on the top plate, we find that this quantized sliding represents a dynamical “pinned” state, characterized by significantly low values of the kinetic friction. While the quantized sliding occurs due to solitons being driven gently, the transition to ordinary unpinned sliding regimes can involve lubricant melting due to large shear-induced Joule heating, for example at large speed. ©2009 American Institute of Physics
History: Received 7 August 2009; accepted 9 October 2009; published 6 November 2009
Permalink: http://link.aip.org/link/?JCPSA6/131/174711/1
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KEYWORDS and PACS

Keywords
PACS
  • 81.40.Pq
    Friction, lubrication, and wear
  • 64.70.dj
    Melting of specific substances
  • 62.20.Qp
    Friction, tribology and hardness
  • YEAR: 2009

PUBLICATION DATA

ISSN:
0021-9606 (print)   1089-7690 (online)
Publisher:
AIP is a member of CrossRef AIP

REFERENCES (31)
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