Translocation of Polymer Through a Nanopore Studied by Langevin Dynamics:Effect of the Friction Coefficient

冯剑; 尚亚卓; 周丽绘; 刘洪来; 胡英

doi:10.1016/S1004-9541(12)60383-8

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Translocation of Polymer Through a Nanopore Studied by Langevin Dynamics:Effect of the Friction Coefficient

FLUID DYNAMICS AND TRANSPORT PHENOMENA | Updated：2026-01-06

- Translocation of Polymer Through a Nanopore Studied by Langevin Dynamics:Effect of the Friction Coefficient
- Chinese Journal of Chemical Engineering Vol. 20, Issue 2, Pages: 231-238(2012)
- Affiliations：
  
  1. Department of Applied Chemistry, Chuzhou University,Anhui,China,239012
  2. State Key Laboratory of Chemical Engineering and Department of Chemistry, East China University of Science and Technology,Shanghai,China,200237
- Author bio：
- Funds：
- DOI：10.1016/S1004-9541(12)60383-8
  CLC：
- Published：2012
- Accepted：
Scan QR Code
FENG Jian, SHANG Yazhuo, ZHOU Lihui, LIU Honglai, HU Ying. Translocation of Polymer Through a Nanopore Studied by Langevin Dynamics:Effect of the Friction Coefficient[J]. Chin.J.Chem.Eng., 2012, 20(2): 231-238.
DOI：

FENG Jian, SHANG Yazhuo, ZHOU Lihui, LIU Honglai, HU Ying. Translocation of Polymer Through a Nanopore Studied by Langevin Dynamics:Effect of the Friction Coefficient[J]. Chin.J.Chem.Eng., 2012, 20(2): 231-238. DOI： 10.1016/S1004-9541(12)60383-8.

摘要

Abstract

The driven polymer translocation through a nanopore with unbiased initial configuration has been studied by using Langevin dynamics(LD) simulations.It is found that the scaling relationship between translocation time and the polymer chain length is strongly affected by the friction coefficient in LD and the driving force.However

there is no scaling relationship between the translocation time and the friction coefficient.The translocation time is almost inversely proportional to the driving force

which is in agreement with those obtained in biased translocation.The scaling relationship between gyration radius(

) of subchain at the

trans

side with the subchain length (

) is

～

0.33

that is in good agreement with the limiting value for molten globule state

while the curve of

of subchain at the

cis

side has two distinct stages.During translocation

the subchain at the

cis

side is being stretched gradually

and the structure of the subchain transforms from sphere-like to rod-like.When the effect of stretching reaches the tail end

the subchain is at the most stretched state.Fina

lly the subchain will rapidly restore to coil structure.According to the results of force analysis

the retarding force at the

trans

side is more crucial during the practical translocation.

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