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In Situ NMR Study of Gel Pore Structure During Aging and Drying

Published online by Cambridge University Press:  25 February 2011

Douglas M. Smith ,
Christopher L. Glaves ,
Pamela J. Davis  and
C. Jeffrey Brinker
Douglas M. Smith
Affiliation:
UNM CENTER FOR MICRO-ENGINEERED CERAMICS, The University of New Mexico, Albuquerque, NM 87131
Christopher L. Glaves
Affiliation:
UNM CENTER FOR MICRO-ENGINEERED CERAMICS, The University of New Mexico, Albuquerque, NM 87131
Pamela J. Davis
Affiliation:
UNM CENTER FOR MICRO-ENGINEERED CERAMICS, The University of New Mexico, Albuquerque, NM 87131
C. Jeffrey Brinker
Affiliation:
Division 1846, Sandia National Laboratories, Albuquerque, NM 87185
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Abstract

Low field NMR spin-lattice relaxation measurements of pore fluid were used to study pore structure during aging and drying of two silica gels. The NMR method provides in situ information concerning pore size, size distribution and surface area which is impossible to obtain by other techniques. Surface areas measured for a sol-gel sample aged in a potassium hydroxide solution were compared to similar measurements made on an ethanol aged sample during drying. Surface area and pore size distributions of the corresponding final dried gels were measured by both NMR and nitrogen adsorption/condensation. The measurements for a given sample were in good agreement. The surface area of samples before drying were much higher than after drying and the base-aged sample had a higher initial surface area than the ethanol-aged sample although after drying, this trend was reversed.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 121: Symposium H – Better Ceramics Through Chemistry III , 1988 , 657
Copyright
Copyright © Materials Research Society 1988

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References

REFERENCES

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