Ultrasound induced lubricity in microscopic contact

Dinelli, F. and Biswas, S. K. and Briggs, G. A. D. and Kolosov, Oleg (1997) Ultrasound induced lubricity in microscopic contact. Applied Physics Letters, 71 (9). pp. 1177-1179. ISSN 0003-6951

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A physical effect of ultrasound induced lubricity is reported. We studied the dynamic friction dependence on out-of-plane ultrasonic vibration of a sample using friction force microscopy and a scanning probe technique, the ultrasonic force microscope, which can probe the dynamics of the tip-sample elastic contact at a submicrosecond scale. The results show that friction vanishes when the tip-surface contact breaks for part of the out-of-plane vibration cycle. Moreover, the friction force reduces well before such a break, and this reduction does not depend on the normal load. This suggests the presence on the surface of a layer with viscoelastic behavior. (C) 1997 American Institute of Physics.

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Applied Physics Letters
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