Characterization studies in microporous silica membranes: Membrane characterization through 129Xe NMR, gas transport, and gas adsorption experiments

 
9783639169881: Characterization studies in microporous silica membranes: Membrane characterization through 129Xe NMR, gas transport, and gas adsorption experiments

Current efforts to design more efficient gas separation membranes are hampered by an incomplete understanding of material structure and of the microscopic features that control gas diffusion in membranes. In this study we seek to develop techniques to characterize these features, and to study the effects of thermal treatment on the properties of microporous silica membranes. We make the important distinction between traditional characterization techniques, which characterize void space, and size exclusion experiments that probe the small subset of features that actually control diffusion. The results of size exclusion, gas adsorption, 129Xe NMR, and transport experiments are combined to propose a model of the amorphous microporous silica structure. Thermal treatment is found to have almost no effect on void space, while profoundly affecting transport rates. We attribute the transport changes to the removal of water from the system, which increases pore interconnectivity thereby allowing alternate diffusion pathways.

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About the Author:

Larry Wagg is a research engineer with Matheson Tri-Gas Inc. in Longmont, Colorado. His interests include Fiats, woodworking, Ultimate Frisbee, and Cygnus (see photo). J. Douglas (Doug) Way is a Professor of Chemical Engineering at the Colorado School of Mines where he has been a faculty member since 1993.

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Book Description Book Condition: New. Publisher/Verlag: VDM Verlag Dr. Müller | Membrane characterization through 129Xe NMR, gas transport, and gas adsorption experiments | Current efforts to design more efficient gasseparation membranes are hampered by an incompleteunderstanding of material structure and of themicroscopic features that control gas diffusion inmembranes. In this study we seek to developtechniques to characterize these features, and tostudy the effects of thermal treatment on theproperties ofmicroporous silica membranes. We make the importantdistinction between traditional characterizationtechniques, which characterize void space, and sizeexclusion experiments that probe the small subset offeatures that actually control diffusion. Theresults of size exclusion, gas adsorption, 129Xe NMR,and transport experiments are combined to propose amodel of the amorphous microporous silica structure.Thermal treatment is found to have almost no effecton void space, while profoundly affecting transportrates. We attribute the transport changes to theremoval of water from the system, which increasespore interconnectivity thereby allowing alternatediffusion pathways. | Format: Paperback | Language/Sprache: english | 361 gr | 220x150x13 mm | 260 pp. Bookseller Inventory # K9783639169881

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