Diffusion in porous materials as probed by pulsed gradient NMR measurements

P.P. Mitra

Physica A: Statistical Mechanics and its Applications, 1997, vol. 241, issue 1, 122-127

Abstract: Due to recent activity involving diffusion measurements using pulsed gradient spin echo techniques, both experimental and theoretical, we now have a better understanding of diffusion of fluid molecules in a large class of natural and artificial porous media. At short times, the restrictions cause deviations from free diffusion that depend only on local properties of the pore-grain interface. This allows quantities such as the time-dependent diffusion coefficient and the return to the origil probability to be calculated exactly, and these results have been experimentally verified. At longer times, diffraction-like effects are observed in the measured momentum-space diffusion propagator, which can be understood in model systems. In general, it is better understood how diffusion measurements may be used to probe the microgeometry of porous media.

Keywords: Diffusion; Porous media; NMR; Short time (search for similar items in EconPapers)
Date: 1997
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Persistent link: https://EconPapers.repec.org/RePEc:eee:phsmap:v:241:y:1997:i:1:p:122-127

DOI: 10.1016/S0378-4371(97)00070-8

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