Atomic Stick-Slip Friction Between Commensurate Self-Assembled Monolayers |
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Authors: | Zhang Tao Wang Hui Hu Yuanzhong |
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Affiliation: | (1) The State Key Laboratory of Tribology, Tsinghua University, Beijing, 100084, China |
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Abstract: | Molecular dynamics (MD) simulations have been used to examine the friction between commensurate self-assembled monolayers (SAMs) on Au (111). The discrepancy between sawtoothed friction force and the discontinuous molecular movements reveals the complex dynamics of the closed-packing chains under shearing. Molecules in the lower monolayer can be divided into two groups with a phase difference of . The periodic motion of the molecules is not synchronous with the frictional stick-slip loops, which result in a second-order valley in friction curves. |
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Keywords: | molecular dynamics simulation self-assembled monolayers friction stick-slip chain dynamics |
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