中国物理B ›› 2015, Vol. 24 ›› Issue (7): 74702-074702.doi: 10.1088/1674-1056/24/7/074702

• ELECTROMAGNETISM, OPTICS, ACOUSTICS, HEAT TRANSFER, CLASSICAL MECHANICS, AND FLUID DYNAMICS • 上一篇    下一篇

Nano watermill driven by revolving charge

周晓艳a b, 寇建龙b, 聂雪川c, 吴锋民a b, 刘扬d, 陆杭军b   

  1. a Department of Physics and Institute of Theoretical Physics, Shanxi University, Taiyuan 030006, China;
    b Department of Physics, Zhejiang Normal University, Jinhua 321004, China;
    c Shanghai Institute of Applied Physics, Chinese Academy of Sciences, Shanghai 201800, China;
    d Department of Mechanical Engineering, The Hong Kong Polytechnic University, Hong Kong 999077, China
  • 收稿日期:2014-11-19 修回日期:2015-02-13 出版日期:2015-07-05 发布日期:2015-07-05
  • 基金资助:

    Project supported by the National Natural Science Foundation of China (Grant Nos. 11005093 and 61274099), the Research Fund of Education Department of Zhejiang Province, China (Grant No. Y201223336), the Zhejiang Provincial Science and Technology Key Innovation Team, China (Grant No. 2011R50012), the Key Laboratory of Zhejiang Province, China (Grant No. 2013E10022), and the Hong Kong Polytechnic University, China (Grant No. G-YL41).

Nano watermill driven by revolving charge

Zhou Xiao-Yan (周晓艳)a b, Kou Jian-Long (寇建龙)b, Nie Xue-Chuan (聂雪川)c, Wu Feng-Min (吴锋民)a b, Liu Yang (刘扬)d, Lu Hang-Jun (陆杭军)b   

  1. a Department of Physics and Institute of Theoretical Physics, Shanxi University, Taiyuan 030006, China;
    b Department of Physics, Zhejiang Normal University, Jinhua 321004, China;
    c Shanghai Institute of Applied Physics, Chinese Academy of Sciences, Shanghai 201800, China;
    d Department of Mechanical Engineering, The Hong Kong Polytechnic University, Hong Kong 999077, China
  • Received:2014-11-19 Revised:2015-02-13 Online:2015-07-05 Published:2015-07-05
  • Contact: Wu Feng-Min, Liu Yang, Lu Hang-Jun E-mail:wfm@zjnu.cn;yang.liu@polyu.edu.hk;zjlhjun@zjnu.cn
  • Supported by:

    Project supported by the National Natural Science Foundation of China (Grant Nos. 11005093 and 61274099), the Research Fund of Education Department of Zhejiang Province, China (Grant No. Y201223336), the Zhejiang Provincial Science and Technology Key Innovation Team, China (Grant No. 2011R50012), the Key Laboratory of Zhejiang Province, China (Grant No. 2013E10022), and the Hong Kong Polytechnic University, China (Grant No. G-YL41).

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摘要：

A novel nanoscale watermill for the unidirectional transport of water molecules through a curved single-walled carbon nanotube (SWNT) is proposed and explored by molecular dynamics simulations. In this nanoscale system, a revolving charge is introduced to drive a water chain confined inside the SWNT, the charge and the tube together serving as a nano waterwheel and nano engine. A resonance-like phenomenon is found, and the revolving frequency of the charge plays a key role in pumping the water chain. The water flux across the SWNT increases with respect to the revolving frequency of the external charge and it reaches its maximum when the frequency is 4 THz. Correspondingly, the number of hydrogen bonds in the water chain inside the SWNT decreases dramatically as the frequency increases from 4 THz to 25 THz. The mechanism behind the resonance phenomenon has been investigated systematically. Our findings are helpful for the design of nanoscale fluidic devices and energy converters.

关键词: water pumping, molecular dynamics simulations, carbon nanotube, revolving charge

Abstract:

A novel nanoscale watermill for the unidirectional transport of water molecules through a curved single-walled carbon nanotube (SWNT) is proposed and explored by molecular dynamics simulations. In this nanoscale system, a revolving charge is introduced to drive a water chain confined inside the SWNT, the charge and the tube together serving as a nano waterwheel and nano engine. A resonance-like phenomenon is found, and the revolving frequency of the charge plays a key role in pumping the water chain. The water flux across the SWNT increases with respect to the revolving frequency of the external charge and it reaches its maximum when the frequency is 4 THz. Correspondingly, the number of hydrogen bonds in the water chain inside the SWNT decreases dramatically as the frequency increases from 4 THz to 25 THz. The mechanism behind the resonance phenomenon has been investigated systematically. Our findings are helpful for the design of nanoscale fluidic devices and energy converters.

Key words: water pumping, molecular dynamics simulations, carbon nanotube, revolving charge

中图分类号:  (Flow phenomena in quasi-one-dimensional systems)

  • 47.60.-i
47.11.Mn (Molecular dynamics methods) 83.10.Mj (Molecular dynamics, Brownian dynamics)