Atomic scale study of superlow friction between hydrogenated diamond surfaces

Date
2004
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Source Title
Physical Review B - Condensed Matter and Materials Physics
Print ISSN
1098-0121
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Publisher
American Physical Society
Volume
70
Issue
24
Pages
1 - 4
Language
English
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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.

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