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Impact of surface roughness on diffusion of confined fluids.

Authors
  • Krekelberg, William P
  • Shen, Vincent K
  • Errington, Jeffrey R
  • Truskett, Thomas M
Type
Published Article
Journal
The Journal of Chemical Physics
Publisher
AIP Publishing
Publication Date
Oct 21, 2011
Volume
135
Issue
15
Pages
154502–154502
Identifiers
DOI: 10.1063/1.3651478
PMID: 22029319
Source
Medline
License
Unknown

Abstract

Using event-driven molecular dynamics simulations, we quantify how the self diffusivity of confined hard-sphere fluids depends on the nature of the confining boundaries. We explore systems with featureless confining boundaries that treat particle-boundary collisions in different ways and also various types of physically (i.e., geometrically) rough boundaries. We show that, for moderately dense fluids, the ratio of the self diffusivity of a rough wall system to that of an appropriate smooth-wall reference system is a linear function of the reciprocal wall separation, with the slope depending on the nature of the roughness. We also discuss some simple practical ways to use this information to predict confined hard-sphere fluid behavior in different rough-wall systems.

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