کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
1807783 1025287 2007 4 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Dynamical aspects of the adsorption hysteresis phenomenon
موضوعات مرتبط
مهندسی و علوم پایه فیزیک و نجوم فیزیک ماده چگال
پیش نمایش صفحه اول مقاله
Dynamical aspects of the adsorption hysteresis phenomenon
چکیده انگلیسی

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.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Magnetic Resonance Imaging - Volume 25, Issue 4, May 2007, Pages 481–484
نویسندگان
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