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Dynamical aspects of the adsorption hysteresis phenomenon

✍ Scribed by Rustem Valiullin; Sergej Naumov; Petrik Galvosas; Jörg Kärger; Peter A. Monson

Publisher
Elsevier Science
Year
2007
Tongue
English
Weight
157 KB
Volume
25
Category
Article
ISSN
0730-725X

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✦ Synopsis

Equilibrium and nonequilibrium transport properties of adsorbates in mesoporous Vycor porous glass have been experimentally studied using nuclear magnetic resonance techniques. With the known geometrical characteristics of porous glass and with measured self-diffusivities, transient sorption curves have been quantitatively compared to those predicted within a Fick's law model. This model correctly describes data outside a hysteresis region. In contrast, in the hysteresis region, a two-step mechanism of density relaxation is required to explain the behavior. These two mechanisms are identified as diffusion at early stages and activated density redistribution at later stages of adsorption. The latter mechanism, being intrinsically slow in nature, is anticipated to prevent the system from reaching equilibrium.

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