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Title
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Transition from single-file to two-dimensional diffusion of interacting particles in a quasi-one-dimensional channel
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Author
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Abstract
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| 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 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. |
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Language
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English
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Source (journal)
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Physical review : E : statistical, nonlinear, and soft matter physics / American Physical Society. - Melville, N.Y., 2001 - 2015
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Publication
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Melville, N.Y.
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American Physical Society
,
2012
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ISSN
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1539-3755
[print]
1550-2376
[online]
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DOI
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10.1103/PHYSREVE.85.031147
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Volume/pages
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85
:3:1
(2012)
, p. 031147,1-031147,12
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Article Reference
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031147
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ISI
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000302117900003
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Medium
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E-only publicatie
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Full text (Publisher's DOI)
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Full text (open access)
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