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Structural Development In Silica Systems

Published online by Cambridge University Press:  21 February 2011

W.H. Dokter,
T.P.M. Beden,
H.F. van Garderen and
R.A. van Santen
W.H. Dokter
Affiliation:
Schuit Institute of Catalysis, University of Technology Eindhoven, P.O. Box 513, 5600 MB Eindhoven, The Netherlands
T.P.M. Beden
Affiliation:
Schuit Institute of Catalysis, University of Technology Eindhoven, P.O. Box 513, 5600 MB Eindhoven, The Netherlands
H.F. van Garderen
Affiliation:
Schuit Institute of Catalysis, University of Technology Eindhoven, P.O. Box 513, 5600 MB Eindhoven, The Netherlands
R.A. van Santen
Affiliation:
Schuit Institute of Catalysis, University of Technology Eindhoven, P.O. Box 513, 5600 MB Eindhoven, The Netherlands
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Abstract

Results obtained with small angle neutron and X-ray scattering will bepresented of systems with various silica concentrations. Silica gels withlow silica concentration exhibit uniform mass fractal behaviour and afterprolonged aging, dual mass fractal behaviour. A zeolite (silicalite)synthesis precursor gel with a high silica concentration was alsoinvestigated and was found to exhibit surface fractal behaviour. A model ispresented, explaining the occurrence of dual fractality after prolongedaging. The change-over from mass fractal behaviour to surface fractalbehaviour is explained, supported by scattering spectra calculated fromsimulated aggregate structures.

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Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 346: Symposium N – Better Ceramics Through Chemistry VI , 1994, 217
Copyright
Copyright © Materials Research Society 1998

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References

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