Capillary condensation in a fractal porous medium

Capillary condensation in a fractal porous medium

Small-angle x-ray and neutron scattering are used to characterize the surface roughness and porosity of a natural rock which are described over three decades in length scales and over nine decades in scattered intensities by a surface fractal dimension D = 2.68+/-0.03. When this porous medium is exp...

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Bibliographic Details
Published in:Physical review letters Vol. 86; no. 23; pp. 5313 - 5316
Main Authors: Broseta, D, Barré, L, Vizika, O, Shahidzadeh, N, Guilbaud, J P, Lyonnard, S
Format: Journal Article
Language:English
Published: United States The American Physical Society 04-06-2001
Subjects:
DIMENSIONS
FRACTALS
NEUTRONS
PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
POROSITY
ROUGHNESS
SCATTERING
THICKNESS
WATER
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Summary:Small-angle x-ray and neutron scattering are used to characterize the surface roughness and porosity of a natural rock which are described over three decades in length scales and over nine decades in scattered intensities by a surface fractal dimension D = 2.68+/-0.03. When this porous medium is exposed to a vapor of a contrast-matched water, neutron scattering reveals that surface roughness disappears at small scales, where a Porod behavior typical of smooth interfaces is observed instead. Water-sorption measurements confirm that such interface smoothing is due predominantly to the water condensing in the most strongly curved asperities rather than covering the surface with a wetting film of uniform thickness.
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content type line 23
US
ISSN:0031-9007
1079-7114
DOI:10.1103/PhysRevLett.86.5313