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Structure of Soluble Silicates

Published online by Cambridge University Press:  15 February 2011

Dale W. Schaefer  and
Keith D. Keefer
Dale W. Schaefer
Affiliation:
Sandia National Laboratories, Albuquerque, NM 87185
Keith D. Keefer
Affiliation:
Sandia National Laboratories, Albuquerque, NM 87185
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Abstract

Small angle x-ray scattering (SAXS) is the technique of choice for the determination of structure on the 10–1000Å scale. We have used this technique to study the growth and topology of the macromolecules which precede gelation in several chemical systems used in sol-gel glass technology. The results show that branched polymers, as opposed to colloids, are formed. The alcoholic silica system is akin to organic systems where gelation occurs through growth and crosslinking of chain molecules. Data are reported from both the Porod and Guinier regions of the SAXS curve and these data are interpreted in terms of geometrical structures predicted by various disorderly growth processes. The results indicate that the degree of crosslinking can be controlled by catalytic conditions. The degree of crosslinking may, in turn, control phase separation and processability to a dense glass.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 32: Symposium B – Better Ceramics Through Chemistry I , 1984 , 1
Copyright
Copyright © Materials Research Society 1984

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References

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