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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 be presented of systems with various silica concentrations. Silica gels with low silica concentration exhibit uniform mass fractal behaviour and after prolonged aging, dual mass fractal behaviour. A zeolite (silicalite) synthesis precursor gel with a high silica concentration was also investigated and was found to exhibit surface fractal behaviour. A model is presented, explaining the occurrence of dual fractality after prolonged aging. The change-over from mass fractal behaviour to surface fractal behaviour is explained, supported by scattering spectra calculated from simulated aggregate structures.

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

REFERENCES

1 Ramsay, J.D.F. and Scanlon, M., Colloids and Surfaces 18, 207 (1986).Google Scholar
2 Her, R.K., The Chemistry of Silica (John Wiley & Sons, New York, 1979), p. 644.Google Scholar
3 Moscou, L., in Introduction to Zeolite Science and Practice, edited by van Bekkum, H., Flanigan, E.M. and Jansen, J.C. (Elsevier Science Publishers, Amsterdam, 1991), p. 1.Google Scholar
4 Scherer, G.W., J. Non-Cryst. Solids 100, 77 (1988)Google Scholar
6 Dokter, W.H., Beelen, T.P.M., van Garderen, H.F., Rummens, C.P.J., van Santen, R.A. and Ramsay, J.D.F., accepted for publication in: Colloids and Surfaces, 1994 Google Scholar
7 Dokter, W.H., Beelen, T.P.M., van Garderen, H.F. and van Santen, R.A., accepted for publication in: J. Appl. Cryst., 1994 Google Scholar
8 Ginter, D.M., Went, G.T., Bell, A.T. and Radke, C.J., Zeolites 12, 733 (1992); 12, 743 (1992)Google Scholar
9 Mandelbrot, B.B., The Fractal Geometry of Nature (Freeman, San Francisco CA, 1979)Google Scholar
10 Ramsay, J.D.F., Chem. Soc. Rev. 15, 335 (1986)Google Scholar
11 Schaefer, D.W., Martin, J.E., Wiltzius, P. and Cannell, D.S., Phys. Rev. Lett. 52, 2371, (1984)Google Scholar
12 Bale, H.D. and Schmidt, P.W., Phys. Rev. Lett. 53, 596 (1983)Google Scholar
13 Meakin, P., in Phase Transitions and Critical Phenomena 12. edited by Domd, C. and Lebowitz, J.L. (Academic Press, London, 1988) p. 335 Google Scholar
14 Jullien, R. and Botet, R., Aggregation and Fractal Aggregates (World Scientific, Singapore, 1986)Google Scholar
15 Forrest, S.R. and Witten, T.A., J. Phys. A., Math. Gen. 12, 109 (1979)Google Scholar
16 van Garderen, H.F., Pantos, E., Dokter, W.H., Beelen, T.P.M., Michels, M.A.J., Hilbers, P.A.J. and van Santen, R.A., submitted to J. Phys. Chem. Google Scholar
17 Meakin, P., J. Coll. Int. Sei., 112 (1), 187–194 (1986)Google Scholar
18 Hasmy, A., Foret, M., Pelous, J. and Jullien, R., Phys. Rev. B, 48 (13), 9345–9353 (1993)Google Scholar
19 Vonk, CG., J. Appl. Cryst. 6, 81 (1973)Google Scholar
20 El Hage-Al Asswad, J., Dewaele, N., Nagy, J.B., Hubert, R.A., Gabelica, Z., Derouane, E.G., Créa, F., Aiello, R. and Nastro, A., Zeolites 8, 221 (1988)Google Scholar