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Effects of Large Load and Shear Rate Variations on the Friction of a Branched Hydrocarbon Liquid

Published online by Cambridge University Press:  11 February 2011

Delphine Gourdon  and
Jacob Israelachvili
Delphine Gourdon
Affiliation:
Department of Chemical Engineering, University of California Santa Barbara, Santa Barbara, CA 93106, U.S.A.
Jacob Israelachvili
Affiliation:
Department of Chemical Engineering, University of California Santa Barbara, Santa Barbara, CA 93106, U.S.A.
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Abstract

Shear measurements were performed on mica surfaces with molecularly thin films of squalane confined between them. Squalane is a branched hydrocarbon liquid that can be in the liquid, glassy or liquid-crystalline state under confinement. The friction forces, especially the transitions between smooth and intermittent (e.g., stick-slip) sliding, were measured over a wide range of applied loads and sliding velocities. The results reveal that, depending on the conditions, qualitatively different behavior can arise in the same system. These include both abrupt and continuous transitions, short and very long transient effects, and chaotic or saw-tooth stick-slip. The differences between these branched and simpler molecules are compared, and the results are analyzed in terms of rate-and-state models traditionally used in the analysis of seismic phenomena.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 750: Symposium Y – Surface Engineering 2002–Synthesis, Characterization and Applications , 2002 , Y8.33
Copyright
Copyright © Materials Research Society 2003

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References

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