(591b) Translocation of Chain Molecules through, Into, and Between Nanopores

Authors: 
Neimark, A. V., Rutgers University
Yang, S., Rutgers University
Kan, Y., Rutgers, The State University of New Jersey
Vishnyakov, A., Rutgers, The State University of New Jersey


We study the dynamics of polymer translocation through and into nanopores with two different coarse-grained modeling techniques. The self-consistent field theory (SCFT) represents the polymer chain as a random walk trajectory in an external field fulfilling the Edwards equation, which treats excluded volume effects in a mean field fashion; the process of translocation is described by the Fokker-Plank equation. The dissipative particle dynamics (DPD) represents the polymer chain as a sequence of soft repelling beads linked together by virtual springs in an explicit solvent; the chain movement is directly simulated with Newton equations, which account for random thermal motion, external field, inter-bead forces and friction with explicit solvent. The goal of our work is to understand the interplay of entropic (confinement size) and external field (adsorption potential) effects. Different model set-ups are considered: translocation through a hole in an impermeable membrane under purely diffusive and forced flow conditions, adsorption into a spherical pore from the bulk, and translocation between the pores of different sizes.