Chemical Research in Chinese Universities ›› 2015, Vol. 31 ›› Issue (4): 658-663.doi: 10.1007/s40242-015-5001-x

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Effect of Hydrodynamic Interaction on Flow-induced Polymer Translocation Through a Nanotube

DING Mingming, DUAN Xiaozheng, LU Yuyuan, SHI Tongfei   

  1. State Key Laboratory of Polymer Physics and Chemistry, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, Changchun 130022, P. R. China
  • Received:2015-01-04 Revised:2015-04-16 Online:2015-08-01 Published:2015-04-27
  • Contact: LU Yuyuan, SHI Tongfei E-mail:yylu@ciac.ac.cn;tfshi@ciac.ac.cn
  • Supported by:

    Supported by the National Basic Research Program of China(No.2009CB930100), the National Natural Science Foundation of China(Nos.21234007, 21304097, 51473168) and the Joint Research Fund for Overseas Chinese, Hong Kong and Macao Young Scientists of the National Natural Science Foundation of China(No.51028301).

Abstract:

We investigated the effect of hydrodynamic interaction(HI) on flow-induced polymer translocation through a nanotube by Brownian dynamics simulations. Whether there is HI in the simulation system is separately controlled by using different diffusion tensors. It is found that HI has no effect on critical velocity flux for long polymer chains due to the competition between more drag force and the hindrance of chain stretching from HI, however, HI broadens the transition interval. In addition, for flow-induced polymer translocation with HI, the critical velocity flux firstly slowly decreases with the increase of chain length and then becomes identical to that of it without HI, that is, the critical velocity flux is independent of chain length. At the same time, HI also accelerates the translocation process and makes the relative variation amplitude of single bead translocation time smaller. In fact, HI can enhance the intrachain cooperativity to make the whole chain obtain more drag force from fluid field and hinder chain stretching, both of which play an important role in translocation process.

Key words: Polymer translocation, Hydrodynamic interaction, Brownian dynamics, Critical velocity flux, Translocation time