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

Chinese Journal of Chemical Engineering ›› 2012, Vol. 20 ›› Issue (2): 231-238.

• FLUID DYNAMICS AND TRANSPORT PHENOMENA • 上一篇下一篇

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

冯剑¹, 尚亚卓², 周丽绘², 刘洪来², 胡英²

1. Department of Applied Chemistry, Chuzhou University, Anhui 239012, China;
2. State Key Laboratory of Chemical Engineering and Department of Chemistry, East China University of Science and Technology, Shanghai 200237, China

收稿日期:2011-03-19 修回日期:2011-06-03 出版日期:2012-04-28 发布日期:2012-05-02
通讯作者: LIU Honglai
基金资助:
Supported by the National Natural Science Foundation of China (20736002, 20706013);the Open Project of the State Key Laboratory of Chemical Engineering ECUST (SKL-ChE-09C02);the Natural Science Fund of the Education Department of Anhui Province (KJ2011B116)

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

FENG Jian¹, SHANG Yazhuo², ZHOU Lihui², LIU Honglai², HU Ying²

1. Department of Applied Chemistry, Chuzhou University, Anhui 239012, China;
2. State Key Laboratory of Chemical Engineering and Department of Chemistry, East China University of Science and Technology, Shanghai 200237, China

Received:2011-03-19 Revised:2011-06-03 Online:2012-04-28 Published:2012-05-02
Supported by:
Supported by the National Natural Science Foundation of China (20736002, 20706013);the Open Project of the State Key Laboratory of Chemical Engineering ECUST (SKL-ChE-09C02);the Natural Science Fund of the Education Department of Anhui Province (KJ2011B116)

摘要/Abstract

摘要： 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(R_g) of subchain at the trans side with the subchain length (L) is R_g～L^0.33 that is in good agreement with the limiting value for molten globule state,while the curve of R_g 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.Finally 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.

关键词: translocation, Langevin dynamics, friction coefficient, polymer, nanopore

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(R_g) of subchain at the trans side with the subchain length (L) is R_g～L^0.33 that is in good agreement with the limiting value for molten globule state,while the curve of R_g 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.Finally 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.

Key words: translocation, Langevin dynamics, friction coefficient, polymer, nanopore

冯剑, 尚亚卓, 周丽绘, 刘洪来, 胡英. Translocation of Polymer Through a Nanopore Studied by Langevin Dynamics:Effect of the Friction Coefficient[J]. Chinese Journal of Chemical Engineering, 2012, 20(2): 231-238.

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.

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

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

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