2005/04/12 by Evy Salcedo, Sebastián Gonçalves, Salcedo, Evy +7
Engineering · Physics and Astronomy · #Adhesion, Friction, and Surface Interactions #FOS: Physical sciences #Force Microscopy Techniques and Applications #Materials Science (cond-mat.mtrl-sci) #Mechanical and Optical Resonators #cond-mat.mtrl-sci
paper · pdf · doi:10.48550/arxiv.cond-mat/0504308
10 pages and 15 figures
arxiv created 2005/04/12 · openalex publication_date 2005/04/12 · arxiv updated 2009/12/01 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/28
The pioneer work of Krim and Widom unveiled the origin of the viscous nature of friction at the atomic scale. This generated extensive experimental and theoretical activity. However, fundamental questions remain open like the relation between sliding friction and the topology of the substrate, as well as the dependence on the temperature of the contact surface. Here we present results, obtained using molecular dynamics, for the phononic friction coefficient (ηph) for a one dimensional model of an adsorbate-substrate interface. Different commensuration relations between adsorbate and substrate are investigated as well as the temperature dependence of ηph. In all the cases we studied ηph depends quadratically on the substrate corrugation amplitude, but is a non-trivial function of the commensuration ratio between substrate and adsorbate. The most striking result is a deep and wide region of small values of ηph for substrate-adsorbate commensuration ratios between ≈ 0.6-0.9. Our results shed some light on contradictory results for the relative size of phononic and electronic friction found in the literature.