Atomic scale study of superlow friction between hydrogenated diamond surfaces
Date
2004Source Title
Physical Review B - Condensed Matter and Materials Physics
Print ISSN
1098-0121
Publisher
American Physical Society
Volume
70
Issue
24
Pages
1 - 4
Language
English
Type
ArticleItem Usage Stats
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Abstract
Strong attractive interaction between two clean diamond (001) slabs turns repulsive upon the hydrogenation of surfaces. This repulsive interaction serves as if a boundary lubricant and prevents the sliding surfaces from being closer to each other even under high normal forces. As a result, calculated lateral force variation generated during sliding has small magnitude under high constant loading forces. Superlow friction observed earlier between diamondlike carbon-coated surfaces can be understood by the steady repulsive interaction between sliding surfaces, as well as strong and stiff carbon-carbon and carbon-hydrogen bonds which do not favor energy dissipation. In ambient conditions, the steady repulsive interaction is, however, destroyed by oxygen atoms which chemically modify those stiff surface bonds.
Keywords
DiamondArticle
Atom
Friction
Hydrogen bond
Hydrogenation
Mathematical analysis
Molecular interaction