The molecular dynamics computational method is used to simulate meniscus fo
rmation around an asperity in a rough surface represented as a sinusoidal w
ave. Simulation results show that the meniscus formation depends on the int
eraction potential between the solid wall and the liquid atoms. For complet
ely and partially dry substrates a meniscus cannot form around an asperity.
For partially and completely wetting substrates the asperity helps to adso
rb the fluid atoms and form a meniscus. These simulation results confirm th
at if the film thickness exceeds a critical value, the capillary pressure c
ontributes strongly to stiction. (C) 2001 American Institute of Physics.