Growth and aging phenomena in silica gels |
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| Authors: | E. Pantos J. B. West W. H. Dokter H. F. Van Garderen T. P. M. Beelen R. A. Van Santen |
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| Affiliation: | (1) SERC, Daresbury Laboratory, WA4 4AD Warrington, Cheshire, U.K.;(2) Schuit Institute of Catalysis, Eindhoven University of Technology, P.O. Box 513, 5600 MB Eindhoven, The Netherlands |
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| Abstract: | Growth and aging of silica aggregates are influenced both by temperature and by catalyzing fluorine ions as shown by SAXS and BET. It was found that both fluorine and increased temperature slightly increased the fractal dimension Df during aging, but the fluorine catalyzed system showed a lower BET surface area.To understand the effect of fluorine and increased temperature on the aggregates, 2D aggregations and SAXS simulations were carried out using two new programs GRASP and DALAI. In agreement with experiments it was found that binary RLCCA aggregates have a slightly higher Df value compared to DLCCA aggregates and that branch-flexibility during aging increases Df even further. |
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| Keywords: | aging in silica gels growth aggregation X-ray scattering |
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