Regensburg 2016 – wissenschaftliches Programm
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CPP: Fachverband Chemische Physik und Polymerphysik
CPP 57: Polymer Dynamics and Rheology (joint session CPP/DY, organized by CPP)
CPP 57.1: Vortrag
Donnerstag, 10. März 2016, 15:00–15:15, H40
Iso-flux tension propagation theory of driven polymer translocation through a nano-pore — •Jalal Sarabadani1, Tapio Ala-Nissila2, and Timo Ikonen3 — 1Department of Applied Physics, Aalto University, Espoo, Finland — 2Department of Applied Physics, Aalto University, Espoo, Finland — 3VTT Technical Research Centre of Finland Ltd., Espoo, Finland
We investigate the dynamics of pore-driven polymer translocation mainly by using analytical model and also by molecular dynamics (MD) simulations [1]. By using the tension propagation theory within the constant flux approximation an explicit equation of motion for the tension front is derived. This equation leads us to a scaling relation for the average translocation time, τ, which captures the asymptotic result τ ∼ N01+ν. Here, N0 is the chain length and ν is the Flory exponent. Moreover, we derive the leading correction-to-scaling term to τ which is a finite chain length correction term (∼ N0) due to the effective pore friction. Then by incorporating the fluctuations in the initial configuration of the polymer into the model in addition to thermal noise, the model not only reproduces previously known results but also considerably improves the estimates of the monomer waiting time distribution and the time evolution of the translocation coordinate s(t), showing excellent agreement with MD simulations. We also discuss the effect of a flickering pore and an oscillating external driving force on the translocation time using the new model [2]. [1] J. Sarabadani, T. Ikonen and T. Ala-Nissila, J. Chem. Phys. (141), 214907 (2014). [2] J. Sarabadani, T. Ikonen and T. Ala-Nissila, J. Chem. Phys. (143), 074905 (2015).