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 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.

Cite this paper

@article{Broseta2001CapillaryCI, title={Capillary condensation in a fractal porous medium.}, author={Daniel Broseta and L{\"{o}ıc Barr{\'e} and O. Vizika and Noushine Shahidzadeh and J. P. Guilbaud and Sandrine Lyonnard}, journal={Physical review letters}, year={2001}, volume={86 23}, pages={5313-6} }