title: Free-energy barrier for electric-field-driven polymer entry into nanoscale channels.
abstract: Free-energy barrier for entry of a charged polymer into a nanoscale channel by a driving electric field is studied theoretically and using molecular dynamics simulations. Dependence of the barrier height on the polymer length, the driving field strength, and the channel entrance geometry is investigated. Squeezing effect of the electric field on the polymer before its entry to the channel is taken into account. It is shown that lateral confinement of the polymer prior to its entry changes the polymer length dependence of the barrier height noticeably. Our theory and simulation results are in good agreement and reasonably describe related experimental data.
authors: Department of Physics, Institute for Advanced Studies in Basic Sciences (IASBS), Zanjan, Iran.
authors: Narges
authors: N
authors: Nikoofard
authors: Hossein
authors: H
authors: Fazli
mesh_terms: D004560:Electricity; D056004:Molecular Dynamics Simulation; D049329:Nanostructures / Q000737:chemistry*; D011108:Polymers / Q000737:chemistry*; D013816:Thermodynamics
chemical_list: D011108:Polymers