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| - An 1H NMR Microimaging Study of Water Vapor Sorption by Individual Porous Pellets
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| - The 1H NMR microimaging technique is applied to study water vapor sorption by the individual cylindricalsilica gel and alumina pellets impregnated with hygroscopic salts. The two-dimensional images or the one-dimensional profiles of the sorbed water distribution are detected sequentially to monitor the transport ofwater within the pellets in real time in the course of the sorption process. The results identify the propagationof the sorbed water front through the dry regions of the pellets as the rate-limiting stage of the sorptionprocess. This propagation can be facilitated by employing the pellets with the eggshell distribution of thesalt, but in such cases the salt redistributes readily in the course of the sorption process, as revealed by therelaxation weighted 1H NMR microimaging experiments in which paramagnetic salts are used. The diffusionequation with water content dependent diffusivity is employed to model the one-dimensional radial profilesof water distribution within the pellet with appropriate correction for the relaxation weighting effects.
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