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Peptide friction in water nanofilm on mica surface |
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| Authors: | Zhou Bo Xiu Peng Wang Chun-Lei Fang Hai-Ping |
| Affiliation: | Department of Physical Biology and Department of Microscopic Water Dynamics, Shanghai Institute of Applied Physics, Chinese Academy of Sciences, P. O. Box 800-204, Shanghai 201800, China;Graduate School of the Chinese Academy of Sciences, Beijing 100190,;Bio-X Laboratory, Department of Physics, Zhejiang University, Hangzhou 310027, China;Department of Physical Biology and Department of Microscopic Water Dynamics, Shanghai Institute of Applied Physics, Chinese Academy of Sciences, P. O. Box 800-204, Shanghai 201800, China;Department of Physical Biology and Department of Microscopic Water Dynamics, Shanghai Institute of Applied Physics, Chinese Academy of Sciences, P. O. Box 800-204, Shanghai 201800, China;Theoretical Physics Center for Science Facilities, Chinese Academy o |
| Abstract: | Peptide frictions in water nanofilms of various thicknesses on a mica surface are studied via molecular dynamics simulations. We find that the forced lateral motion of the peptide exhibits stick-slip behaviour at low water coverage; in contrast, the smooth gliding motion is observed at higher water coverage. The adsorbed peptide can form direct peptide-surface hydrogen bonds as well as indirect peptide-water-surface hydrogen bonds with the substrate. We propose that the stick-slip phenomenon is attributed to the overall effects of direct and indirect hydrogen bonds formed between the surface and the peptide. |
| Keywords: | peptide friction water nanofilm mica surface molecular dynamics simulation |
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