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S.A.N.S. Study Of Fractal Alumino-Silicate Aerogels

Published online by Cambridge University Press:  28 February 2011

F. Chaput ,
J.P. Boilot ,
A. Dauger ,
F. Devreux  and
A. De Geyer
F. Chaput
Affiliation:
Laboratoire de Physique de la Matière Condensée, URA CNRS 1254, Ecole Polytechnique, 91128 Palaiseau Cédex(FRANCE)
J.P. Boilot
Affiliation:
Laboratoire de Physique de la Matière Condensée, URA CNRS 1254, Ecole Polytechnique, 91128 Palaiseau Cédex(FRANCE)
A. Dauger
Affiliation:
Ecole Nationale Supérieure de Céramique Industrielle, 87065Limoges Cédex(FRANCE)
F. Devreux
Affiliation:
Laboratoire de Physique de la Matière Condensée, URA CNRS 1254, Ecole Polytechnique, 91128 Palaiseau Cédex(FRANCE)
A. De Geyer
Affiliation:
Institut Laüe-Langevin, 156X. 38042 Grenoble Cédex(FRANCE)
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Abstract

Small angle scattering clearly shows that aluminosilicate aerogels, prepared from Si-Al double precursor, form mutually self-similar volume fractals at least in the range of densities 40-160kg/m3. The structure, insensitive to the pH of the added water, consists of primary homogeneous rough units attached into volume fractal clusters (D=2.1) .Heating at 800°C oxidizes residual organic groups and decreases the roughness of the unit particles. Densification above 900°C both implies increasing of the size of units and decreasing of the fractal domain.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 180: Symposium A – Better Ceramics Through Chemistry IV , 1990 , 305
Copyright
Copyright © Materials Research Society 1990

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References

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