Role of Defects in Compression and Friction of Anchored Hydrocarbon Chains on Diamond
1999; American Chemical Society; Volume: 16; Issue: 2 Linguagem: Inglês
10.1021/la991225u
ISSN1520-5827
AutoresAlan B. Tutein, Steven J. Stuart, Judith A. Harrison,
Tópico(s)Mechanical and Optical Resonators
ResumoThe classical molecular dynamics simulations presented here examine the compression and friction of monolayers composed of linear hydrocarbon chains with 8, 13, or 22 carbon atoms that are chemically bound (or anchored) to a diamond (111) substrate. The roles structural defects and their formation play in compression, friction, and energy dissipation processes are examined. The number of defects increases under increasing load, reaching a plateau at a specified load. Defects are also clearly implicated in the energy dissipation associated with sliding friction. The friction is found to be highest in shorter chains and disordered surfaces, in agreement with previous atomic force microscopy studies.
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