Thumbnail
Access Restriction
Open

Author Braun, O. M. ♦ Bishop, A. R. ♦ Roeder, J.
Source United States Department of Energy Office of Scientific and Technical Information
Content type Text
Language English
Subject Keyword PHYSICS ♦ LUBRICATION ♦ SLIDING FRICTION ♦ LUBRICANTS ♦ SIMULATION ♦ LANGEVIN EQUATION ♦ THIN FILMS ♦ SUBSTRATES ♦ LENNARD-JONES POTENTIAL ♦ ENERGY LOSSES ♦ PHONONS
Abstract Using Langevin simulations, we study dynamical transitions in a model three-layer atomic film confined between two rigid substrates moving with respect to each other. With the increase of a dc force applied to the top substrate, first the middle layer of the lubricant film transitions from locked to sliding states; this regime shows a stick-slip behavior with a relatively high effective friction. Next, the layers closest to the substrates start to slide over the substrates, as well as with respect to the middle layer; the effective friction in this regime may be explained by energy losses due to the excitation of phonons in the lubricant. Finally, at high velocities the lubricant film decouples from the substrates and achieves a {open_quotes}flying{close_quotes} regime characterized by a very low friction coefficient. {copyright} {ital 1999} {ital The American Physical Society}
ISSN 00319007
Educational Use Research
Learning Resource Type Article
Publisher Date 1999-04-01
Publisher Department Los Alamos National Laboratory
Publisher Place United States
Journal Physical Review Letters
Volume Number 82
Issue Number 15
Organization Los Alamos National Laboratory


Open content in new tab

   Open content in new tab