23 December 2003 Defects and friction in alkylsilane self-assembled monolayers
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Proceedings Volume 5343, Reliability, Testing, and Characterization of MEMS/MOEMS III; (2003) https://doi.org/10.1117/12.524562
Event: Micromachining and Microfabrication, 2004, San Jose, California, United States
Abstract
The adhesion and friction between pairs of self-assembled monolayers (SAMs) of alkylsilane chains on a silicon dioxide surface are studied using molecular dynamics simulations. We study chains with n=6, 8, 12, and 18 carbons in the backbone for both fully packed and defected monolayers. The defects are introduced by the random removal of chains from a well-ordered crystalline substrate. The adhesion force between monolayers at a given separation is found to increase monotonically with chain length and with coverage for a fixed chain length for the crystalline substrate. Friction simulations were performed at a relative shear velocity of 2 m/s at constant applied loads between 200 and 600 MPa. Stick slip motion is observed at full coverage, but disappears with the inclusion of 10% defects. We find that with the addition of random defects, the friction becomes insensitive to both chain length and defect density.
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Michael Chandross, Michael Chandross, Gary S. Grest, Gary S. Grest, Mark J. Stevens, Mark J. Stevens, Edmund B. Webb, Edmund B. Webb, } "Defects and friction in alkylsilane self-assembled monolayers", Proc. SPIE 5343, Reliability, Testing, and Characterization of MEMS/MOEMS III, (23 December 2003); doi: 10.1117/12.524562; https://doi.org/10.1117/12.524562
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