Toolbox for 3D Imaging and Modeling of Porous Media: Relationship with Transport Properties

Porous media can be considered as interfacial systems where an internal surface partitions and fills the space in a complex way. Meaningful structural features appear on a length-scale where physical chemistry plays a central role either to impose a specific organization on the material or to strongly modify the dynamics and thermodynamics of the embedded fluids. A key issue is to understand how geometrical and interfacial confinement affects phenomena such as molecular diffusion, excitation relaxation, reaction kinetics, phase transitions, adsorption, and capillary condensation. This paper first reviews some experimental techniques able to image the 3-D structure of disordered porous media. In the second part, the geometrical and particularly some topological properties of a disordered porous material are analyzed. The interest and limits of several strategies for obtaining 3-D representations of various pore networks starting from an incomplete set of morphological characterizations are discussed. Lastly, connections between geometry and diffusive transport are presented, with an emphasis on the application of pulsed gradient spin echo NMR technique as a tool for a multiscale analysis of transport in a confining geometry.

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  • English

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  • Accession Number: 01046649
  • Record Type: Publication
  • Files: TRIS
  • Created Date: Apr 8 2007 1:43PM