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ON THE CONCENTRATION-DEPENDENCE OF SURFACE-DIFFUSION COEFFICIENTS IN CAPILLARY POROUS MATERIALS

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Title ON THE CONCENTRATION-DEPENDENCE OF SURFACE-DIFFUSION COEFFICIENTS IN CAPILLARY POROUS MATERIALS
 
Creator BHATIA, SK
DO, DD
 
Subject adsorbed gases
small pores
model
media
transport
adsorption
solids
flow
 
Description The influence of structural heterogeneity, in the form of a non-uniform pore size distribution, on the isotherms and surface diffusion coefficients for monolayer physical adsorption is studied. A pore size dependent langmuirian isotherm is used along with consideration of equality of chemical potentials at the pore mouths at an intersection. The diffusion is modelled by a recently developed random walk formulation. It is found that the surface diffusion coefficients are strongly influenced by the heterogeneity and have a stronger increase with overall coverage than that predicted by the Darken equation. The results are found to match the experimental data of P. C. Carman and F. A. Raal on the diffusion of carbon dioxide in carbon black without the use of a fitting parameter.
 
Publisher ROYAL SOC LONDON
 
Date 2011-08-29T00:15:51Z
2011-12-26T12:58:16Z
2011-12-27T05:47:54Z
2011-08-29T00:15:51Z
2011-12-26T12:58:16Z
2011-12-27T05:47:54Z
1991
 
Type Article
 
Identifier PROCEEDINGS OF THE ROYAL SOCIETY OF LONDON SERIES A-MATHEMATICAL PHYSICAL AND ENGINEERING SCIENCES, 434(1891), 317-340
1364-5021
http://dx.doi.org/10.1098/rspa.1991.0095
http://dspace.library.iitb.ac.in/xmlui/handle/10054/11879
http://hdl.handle.net/10054/11879
 
Language en