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Fluorine In Silica Gels

Published online by Cambridge University Press:  28 February 2011

E. M. Rabinovich  and
D. L. Wood
E. M. Rabinovich
Affiliation:
AT&T Bell Laboratories, Murray Hill, NJ 07974
D. L. Wood
Affiliation:
AT&T Bell Laboratories, Murray Hill, NJ 07974
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Abstract

Fluorine has a remarkable and diverse action in silica sols, gels and gel-derived glasses. Introduced in ionic form, it causes more rapid gelation, it reduces surface area and water adsorption of dry gels, and it helps to eliminate bubble formation during sintering and reheating of gel-derived glasses. The mechanisms for these actions of the fluoride ion are reviewed, with a more detailed discussion of the rate of gelation. Several previously held views of the way fluoride accelerates gel formation are compared with a new suggestion that it is caused by an electrostatic attraction between the proton of the OH of silicic acid and F− present as Si-F groups.

Type
Articles
Information
MRS Online Proceedings Library (OPL) , Volume 73: Symposium H – Better Ceramics Through Chemistry II , 1986 , 251
Copyright
Copyright © Materials Research Society 1986

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References

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