Friction between solids and adsorbed fluids is spatially distributed at the nanoscale

Bhatia, Suresh K. and Nicholson, David (2013) Friction between solids and adsorbed fluids is spatially distributed at the nanoscale. Langmuir, 29 47: 14519-14526. doi:10.1021/la403445j

Author Bhatia, Suresh K.
Nicholson, David
Title Friction between solids and adsorbed fluids is spatially distributed at the nanoscale
Journal name Langmuir   Check publisher's open access policy
ISSN 0743-7463
Publication date 2013-11-26
Year available 2013
Sub-type Article (original research)
DOI 10.1021/la403445j
Open Access Status
Volume 29
Issue 47
Start page 14519
End page 14526
Total pages 8
Place of publication Washington, DC United States
Publisher American Chemical Society
Collection year 2014
Language eng
Subject 1603 Demography
3104 Condensed Matter Physics
3110 Surfaces and Interfaces
2500 Materials Science
1607 Social Work
Abstract The widespread developments in the use of nanomaterials in catalysis, adsorption, and nanofluidics present significant new challenges in achieving optimal adsorbed fluid flow characteristics. Here we demonstrate, using molecular dynamics simulations of nanoconfined fluids, that at nanoscales, fluid-solid friction is not restricted to a sharp interface as is commonly assumed; instead it is distributed over the whole adsorbed fluid phase, and is strongest in an interfacial region that is not negligible in comparison to the system size. Our simulations yield position-dependent dynamical fluid-solid friction coefficients, and lead to a modification of conventional hydrodynamics, incorporating distributed momentum loss in the fluid due to fluid-solid interaction. The results demonstrate that the usual concepts of slip length or interfacial friction coefficient are meaningful only for uniform fluids, and lose their significance for adsorbates in nanospaces, which are intrinsically inhomogeneous. We show that static friction coefficients, based on equilibrium density distributions, follow the same spatial dependence as the dynamical coefficients. These results open up possibilities for tailoring nanomaterials and surfaces to engineer low friction pathways for adsorbed fluid flow by tuning the potential energy landscape.
Q-Index Code C1
Q-Index Status Confirmed Code
Institutional Status UQ

Document type: Journal Article
Sub-type: Article (original research)
Collections: School of Chemical Engineering Publications
Official 2014 Collection
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Citation counts: TR Web of Science Citation Count  Cited 2 times in Thomson Reuters Web of Science Article | Citations
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