Non-Amontons behavior of friction in single contacts

Details Non-Amontons behavior of friction in single contacts Non-Amontons behavior of friction in single contacts

2005-10-10

arxiv.org/abs/cond-mat/0510232v1

European Physical Journal E 19 (2006) 163

Physics

Condensed Matter

Soft Condensed Matter

submitted to Eur. Phys. J. E

Scientific paper

10.1140/epje/e2006-00019-2

We report on the frictional properties of a single contact between a glassy polymer lens and a flat silica substrate covered either by a disordered or by a self-assembled alkylsilane monolayer. We find that, in contrast to common belief, the Amontons proportionality between frictional and normal stresses does not hold. Besides, we observe that the velocity dependence of the sliding stress is strongly sensitive to the structure of the silane layer. Analysis of the frictional rheology observed on both disordered and self-assembled monolayers suggests that dissipation is controlled by the plasticity of a glass-like interfacial layer in the former case, and by pinning of polymer chains on the substrate in the latter one.

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