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Phys Rev Lett. 2010 Dec 31;105(26):266101. Epub 2010 Dec 20.

Transverse shear oscillator investigation of boundary lubrication in weakly adhered films.

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1
Université Paris Est, Laboratoire de Physique des Matériaux divisés et Interfaces CNRS FRE 3300, Marne la Vallée, France. julien.leopoldes@univ-mlv.fr

Abstract

We investigate the boundary lubrication in weakly adhered molecularly thin films deposited between a sphere and a plane, below the sliding threshold. The shear contact stiffness and interfacial dissipation at the micrometer scale are determined with a high-frequency quartz oscillator. Two distinct behaviors are found as a function of the shear oscillation: a linear viscoelastic response at low amplitude and a nonlinear frictional microslip at high amplitude. A friction model is proposed to analyze the data, which allows evaluating the shear strength, the friction coefficient, and the interfacial viscosity at different solid interfaces under low load.

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