MOLECULAR-ORIGINS OF FRICTION - THE FORCE ON ADSORBED LAYERS
MOLECULAR-ORIGINS OF FRICTION - THE FORCE ON ADSORBED LAYERS
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DOI：
10.1126/science.265.5176.1209
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发表时间：
1994-08-26
期刊：
影响因子：
56.9
通讯作者：
ROBBINS, MO
中科院分区：
文献类型：
--
作者：
CIEPLAK, M;SMITH, ED;ROBBINS, MO
Simulations and perturbation theory are used to study the molecular origins of friction in an ideal model system, a layer of adsorbed molecules sliding over a substrate. These calculations reproduce several surprising features of experimental results. In most cases, the frictional force on a solid monolayer has a different form from that observed between macroscopic solids. No threshold force or static friction is needed to initiate sliding; instead, the velocity is proportional to the force. As in experiments, incommensurate solid layers actually slide more readily than fluid layers. A comparison of experiment, simulation, and analytic results shows that dissipation arises from anharmonic coupling between phonon modes and substrate-induced deformations in the adsorbate.
