Published Research - Department of Chemistry


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Published by American Institute of Physics. J. Chem. Physics VOLUME 113, NUMBER 24, 22 DECEMBER 2000. ©2000 American Institute of Physics. Permission to use.


The effects of a physisorbed film on the force of static friction in a model contact (monatomic adsorbate confined between plane-parallel walls) were investigated by Monte Carlo simulation. At fixed coverage the friction curve (shear yield stress vs normal stress) exhibits a marked nonlinearity, which results from a competition between adsorbate–wall interactions that predominate at low loads and wall–wall interactions that set in beyond a threshold load, which increases with coverage. Previous proximal-probe and computer experiments, carried out at high coverages, see only the initial (low-load) linear portion of the friction curve.

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