title: Unexpected crossover dynamics of single polymer in a corrugated tube.
abstract: We present molecular dynamics study of a generic (coarse-grained) model for single-polymer diffusion confined in a corrugated cylinder. For a narrow tube, i.e., diameter of the cylinder δ < 2.3, the axial diffusion coefficient D(∣∣) scales as D(∣∣) ∝ N(-3∕2), with chain length N, up to N ≈ 100 and then crosses over to Rouse scaling for the larger N values. The N(-3∕2) scaling is due to the large fluctuation of the polymer chain along its fully stretched equilibrium conformation. The stronger scaling, namely N(-3∕2), is not observed for an atomistically smooth tube and/or for a cylinder with larger diameter.
authors.affiliation: Instituto de Investigaciones Fisicoquimicas Teoricas y Aplicadas (INIFTA), C. C. 16, Suc. 4, 1900 La Plata, Argentina.
authors.forename: Andres
authors.initials: A
authors.lastname: De Virgiliis
authors.forename: Lukasz
authors.initials: L
authors.lastname: Kuban
authors.forename: Jaroslaw
authors.initials: J
authors.lastname: Paturej
authors.forename: Debashish
authors.initials: D
authors.lastname: Mukherji
mesh_terms: D004058:Diffusion; D056004:Molecular Dynamics Simulation; D011108:Polymers / Q000737:chemistry*
chemical_list: D011108:Polymers