Interaction potential and hopping dynamics governing sliding friction

The friction force on a nanometer-sized tip sliding on a surface is related to the thermally activated hopping of the contact atoms on an effective atomic interaction potential. A general analytical expression relates the height of this potential and the hopping attempt frequency to measurements of the velocity dependence of the friction force performed with an atomic force microscope. While the height of the potential is roughly proportional to the normal load, the attempt frequency falls in the range of mechanical eigenfrequencies of the probing tip in contact with the surface.


Published in:
Physical Review Letters, 91, 8, 084502
Year:
2003
ISSN:
0031-9007
ISBN:
0031-9007
Keywords:
Other identifiers:
Laboratories:




 Record created 2009-04-14, last modified 2018-03-17

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