Ultrasound induced lubricity in microscopic contact
1997; American Institute of Physics; Volume: 71; Issue: 9 Linguagem: Inglês
10.1063/1.120417
ISSN1520-8842
AutoresFranco Dinelli, S.K. Biswas, G. A. D. Briggs, Oleg Kolosov,
Tópico(s)Adhesion, Friction, and Surface Interactions
ResumoA 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.
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