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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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Université Paris Est, Laboratoire de Physique des Matériaux divisés et Interfaces CNRS FRE 3300, Marne la Vallée, France.


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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