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Capillary condensation in a fractal porous medium | | D Broseta
; L Barré
; O Vizika
; N Shahidzadeh
; J P Guilbaud
; S Lyonnard
; | | Date: |
4 Jun 2001 | | Journal: | Phys Rev Lett, 86 (23), 5313-6 | | Abstract: | 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. | | Source: | PubMed, pmid11384486 | | Services: | Forum | Review | Favorites | |
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