Driven polymer translocation through nanopores: slow versus fast dynamics
| Autor: | Luo, Kaifu, Ala-Nissila, Tapio, Ying, See-Chen, Metzler, Ralf |
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| Rok vydání: | 2009 |
| Předmět: | |
| Zdroj: | EPL, 88, 68006 (2009) |
| Druh dokumentu: | Working Paper |
| DOI: | 10.1209/0295-5075/88/68006 |
| Popis: | 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 $\tau$ versus the length of the polymer, $\tau\sim N^{\alpha}$. For slow translocation, i.e., under low driving force and/or high friction, we find $\alpha \approx 1+\nu \approx 1.588$ where $\nu$ denotes the Flory exponent. In contrast, $\alpha\approx 1.37$ 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 $\tau \sim F^{-1}$ and $\tau \sim F^{-0.80}$ for slow and fast translocation, respectively. These results clarify the controversy on the magnitude of the scaling exponent $\alpha$ for driven translocation. Comment: 6 pages, 7 figures, to appear in EPL (Europhysics Letters) |
| Databáze: | arXiv |
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