Driven polymer translocation through nanopores: Slow-vs.-fast dynamicsK. Luo1, 2, T. Ala-Nissila3, 4, S.-C. Ying4 and R. Metzler1
1 Physics Department, Technical University of Munich - D-85748 Garching, Germany, EU
2 Department of Polymer Science and Engineering and CAS Key Laboratory of Soft Matter Chemistry University of Science and Technology of China - Hefei, Anhui 230026, China
3 Department of Applied Physics and COMP Center of Excellence, Helsinki University of Technology P.O. Box 1100, FIN-02015 TKK, Espoo, Finland, EU
4 Department of Physics, Brown University, P.O. Box 1843, Providence, RI 02912, USA
received 27 August 2009; accepted in final form 25 November 2009; published December 2009
published online 4 January 2010
We investigate the dynamics of polymer translocation through nanopores under external driving by 3D Langevin Dynamics simulations, focusing on the scaling of the average translocation time vs. the length of the polymer, . For slow translocation, i.e., under low driving force and/or high friction, we find 1.588, where denotes the Flory exponent. In contrast, 1.37 is observed for fast translocation due to the highly deformed chain conformation on the trans side, reflecting a pronounced non-equilibrium situation. The dependence of the translocation time on the driving force is given by ~ F-1 and ~ F-0.80 for slow and fast translocation, respectively. These results clarify the controversy on the magnitude of the scaling exponent for driven translocation.
87.15.A- - Theory, modeling, and computer simulation.
87.15.H- - Dynamics of biomolecules.
36.20.-r - Macromolecules and polymer molecules.
© EPLA 2009