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Periodic Mesoporous Silica Gels

Published online by Cambridge University Press:  10 February 2011

M. T. Anderson ,
J. E. Martin ,
J. G. Odinek ,
P. Newcomer  and
J. P. Wilcoxon
M. T. Anderson
Affiliation:
Sandia National Laboratories, P.O. Box 5800, Albuquerque, NM 87185
J. E. Martin
Affiliation:
Sandia National Laboratories, P.O. Box 5800, Albuquerque, NM 87185
J. G. Odinek
Affiliation:
Sandia National Laboratories, P.O. Box 5800, Albuquerque, NM 87185
P. Newcomer
Affiliation:
Sandia National Laboratories, P.O. Box 5800, Albuquerque, NM 87185
J. P. Wilcoxon
Affiliation:
Sandia National Laboratories, P.O. Box 5800, Albuquerque, NM 87185
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Abstract

We have synthesized monolithic particulate gels of periodic mesoporous silica by adding tetramethoxysilane to a homogeneous alkaline micellar precursor solution. The gels exhibit 5 characteristic length scales over 4 orders of magnitude: fractal domains larger than the particle size (>500 nm), particles that are ˜150 to 500 nm in diameter, interparticle pores that are on the order of the particle size, a feature in the gas adsorption measurements that indicates pores ˜10–50 nm, and periodic hexagonal arrays of ˜3 nm channels within each particle. The wet gel monoliths exhibit calculated densities as low as ˜0.02 g/cc; the dried and calcined gels have bulk densities that range from ˜0.3–0.5 g/cc. The materials possess large interparticle (˜1.0–2.3 cc/g) and intraparticle (˜0.6 cc/g) porosities.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 431: Symposium P – Microporous and Macroporous Materials , 1996 , 95
Copyright
Copyright © Materials Research Society 1996

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References

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