Transition from single-file to two-dimensional diffusion of interacting particles in a quasi-one-dimensional channel
Faculty of Sciences. Physics

article

2012
Melville, N.Y. :American Physical Society
, 2012

Physics

Physical review : E : statistical, nonlinear, and soft matter physics / American Physical Society. - Melville, N.Y., 2001 - 2015

85(2012)
:3:1
, p. 031147,1-031147,12

1539-3755

1550-2376

031147

000302117900003

E-only publicatie

English (eng)

University of Antwerp

Diffusive properties of a monodisperse system of interacting particles confined to a quasi-one-dimensional channel are studied using molecular dynamics simulations. We calculate numerically the mean-squared displacement (MSD) and investigate the influence of the width of the channel (or the strength of the confinement potential) on diffusion in finite-size channels of different shapes (i.e., straight and circular). The transition from single-file diffusion to the two-dimensional diffusion regime is investigated. This transition [ regarding the calculation of the scaling exponent (alpha) of the MSD <Delta x(2)(t)> proportional to t(alpha)] as a function of the width of the channel is shown to change depending on the channel's confinement profile. In particular, the transition can be either smooth (i.e., for a parabolic confinement potential) or rather sharp (i.e., for a hard-wall potential), as distinct from infinite channels where this transition is abrupt. This result can be explained by qualitatively different distributions of the particle density for the different confinement potentials.

https://repository.uantwerpen.be/docman/irua/6cc63e/1560.pdf

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