Nondestructive characterization of nanopore microstructure: Spatially resolved Brunauer–Emmett–Teller isotherms using nuclear magnetic resonance imaging

This article presents the results of nuclear magnetic resonance imaging (MRI) studies of gas adsorption/desorption in nanoporous solids. MR images obtained as a function of the equilibrium pressure, at constant temperature, form a pixel-by-pixel map of adsorption isotherms. Analysis of these isother...

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Bibliographic Details
Published in:Journal of applied physics 2003-07, Vol.94 (2), p.935-941
Main Authors: Beyea, Steven D., Caprihan, Arvind, Glass, S. Jill, DiGiovanni, Anthony
Format: Article
Language:English
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Summary:This article presents the results of nuclear magnetic resonance imaging (MRI) studies of gas adsorption/desorption in nanoporous solids. MR images obtained as a function of the equilibrium pressure, at constant temperature, form a pixel-by-pixel map of adsorption isotherms. Analysis of these isotherms using Brunauer–Emmett–Teller (BET) theory results in spatial maps of the specific surface area, the net energy of adsorption, and the pore morphology. Results obtained using MRI for γ-Al2O3 and ZnO powders and partially sintered ceramics of these materials, as well as Vycor® porous glass, compare well to results for bulk samples obtained using conventional N2 BET adsorption. MRI studies of gas adsorption are shown to provide statistical averages of the pore microstructure parameters, resolved on a macroscopic scale.
ISSN:0021-8979
1089-7550
DOI:10.1063/1.1581348