Ultrasound induced lubricity in microscopic contact

Year: 1997

Authors: Dinelli F., Biswas S.K., Briggs G.A.D., Kolosov O.V.

Autors Affiliation: Department of Materials, University of Oxford, Oxford, OX1 3PH, United Kingdom; Indian Institute of Science, Bangalore, India

Abstract: 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.

Journal/Review: APPLIED PHYSICS LETTERS

Volume: 71 (9)      Pages from: 1177  to: 1179

KeyWords: Scanning probe technique; Ultrasonic force microscope; Vibrations (mechanical); Viscoelasticity; Friction force microscope
DOI: 10.1063/1.120417

Citations: 86
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