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An Electron Microscopy Study of the Alkaline Hydrolysis Products of Tetraethoxysilane

Published online by Cambridge University Press:  25 February 2011

Jeffrey Adams ,
Thomas Baird ,
Paul S. Braterman ,
James A. Cairns  and
David L. Segal
Jeffrey Adams
Affiliation:
Chemistry Department, University of Glasgow, Glasgow, G12 8QQ, Scotland.
Thomas Baird
Affiliation:
Chemistry Department, University of Glasgow, Glasgow, G12 8QQ, Scotland.
Paul S. Braterman
Affiliation:
Chemistry Department, University of Glasgow, Glasgow, G12 8QQ, Scotland.
James A. Cairns
Affiliation:
Engineering Sciences Division, AERE Harwell, Oxon. 0X11 ORA, England
David L. Segal
Affiliation:
Engineering Sciences Division, AERE Harwell, Oxon. 0X11 ORA, England
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Abstract

The hydrolysis of tetraethoxysilane was studied in an ethanol-water system with ammonium hydroxide catalyst. Reactions were carried out with water concentrations of 5M and 10M and ammonia concentrations up to 1.7M, and the products examined by electron optical methods. Variation of reagent concentrations lead to changes in the product morphology from small irregular particles, through roughly spherical and spherical particles to large fused particles. Within the range of particulate material the variations in size can be related to the effect of reagent concentrations by consideration of the reactions occurring. The effect on morphology of replacing ammonia with ethylamine was investigated and resembles that of the use of much higher ammonia concentrations.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 121: Symposium H – Better Ceramics Through Chemistry III , 1988 , 361
Copyright
Copyright © Materials Research Society 1988

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References

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