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Structural Observations of Porous Silica Gels

Published online by Cambridge University Press:  28 February 2011

M. W. Shafer ,
V. Castano ,
W. Krakow ,
R. A. Figat  and
G. C. Ruben
M. W. Shafer
Affiliation:
IBM Thomas J. Watson Research Center, P. O. Box 218, Yorktown Heights, New York 10598
V. Castano
Affiliation:
IBM Thomas J. Watson Research Center, P. O. Box 218, Yorktown Heights, New York 10598
W. Krakow
Affiliation:
IBM Thomas J. Watson Research Center, P. O. Box 218, Yorktown Heights, New York 10598
R. A. Figat
Affiliation:
IBM Thomas J. Watson Research Center, P. O. Box 218, Yorktown Heights, New York 10598
G. C. Ruben
Affiliation:
Dept. Biology, Dartmouth College, Hanover, New Hampshire 03755
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Abstract

Silica gels were prepared by two methods; from the alkoxides under conditions where moderate degrees of crosslinking are expected and from LUDOX - alkaline silicate sols from which the alkali was subsequently removed. By selective thermal treatment from 300 to 850°C, pore diameters (excluding micropores) in the range 35Å to 400Å are seen. The pore size increased with temperature while the surface area and total porosity remained essentially constant. Extensive high resolution TEM analyses showed both colloid and polymeric structures with particle sizes between 60Å and 250Å which decreased on heating. An intra particle structure, presumably micropores of 10Å to 30Å is also seen. By using a shadow cast Pt-C replica technique, stereoimages show the particles to have a filamentry type structure.

Type
Articles
Information
MRS Online Proceedings Library (OPL) , Volume 73: Symposium H – Better Ceramics Through Chemistry II , 1986 , 331
Copyright
Copyright © Materials Research Society 1986

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References

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