中国物理B ›› 2012, Vol. 21 ›› Issue (2): 26801-026801.doi: 10.1088/1674-1056/21/2/026801

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周波1 2,修鹏3,王春雷1,方海平1 4   

  • 收稿日期:2011-05-17 修回日期:2011-07-22 出版日期:2012-01-30 发布日期:2012-01-30
  • 通讯作者: 方海平,fanghaiping@sinap.ac.cn E-mail:fanghaiping@sinap.ac.cn

Peptide friction in water nanofilm on mica surface

Zhou Bo(周波)a)b), Xiu Peng(修鹏)c), Wang Chun-Lei(王春雷)a), and Fang Hai-Ping(方海平)a)d)†   

  1. a. 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;
    b. Graduate School of the Chinese Academy of Sciences, Beijing 100190, China;
    c. Bio-X Laboratory, Department of Physics, Zhejiang University, Hangzhou 310027, China;
    d. Theoretical Physics Center for Science Facilities, Chinese Academy of Sciences, 19(B) Yuquan Road, Beijing 100049, China
  • Received:2011-05-17 Revised:2011-07-22 Online:2012-01-30 Published:2012-01-30
  • Contact: Fang Hai-Ping,fanghaiping@sinap.ac.cn E-mail:fanghaiping@sinap.ac.cn
  • Supported by:
    Project supported by the National Natural Science Foundation of China (Grant No. 10825520), the National Basic Research Program of China (Grant No. 2007CB936000), and the National Science Foundation for Post-Doctoral Scientists of China (Grant No. 20100480645).

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.

Key words: peptide friction, water nanofilm, mica surface, molecular dynamics simulation

中图分类号:  (Atomic scale friction)

  • 68.35.Af
81.40.Pq (Friction, lubrication, and wear) 68.08.-p (Liquid-solid interfaces) 68.47.Pe (Langmuir-Blodgett films on solids; polymers on surfaces; biological molecules on surfaces)