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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References
Iler, R.K., The Chemistry of Silica, Wiley and Sons Inc., New York, 1979.
Knight, C.T.G., J. Chem. Soc., Dalton Trans. (1988) 1457.
Brinker, C.J. and Scherer, G.W., Sol-gel Science, Academic Press, San Diego, 1990.
Wijnen, P.W.J.G., Beelen, T.P.M., Rummens, C.P.J., Saeijs, H.C.P.L., de Haan, J.W., van de Ven, L.J.M., and van Santen, R.A., J. Coll. Interf. Sci., 145 (1991) 17.
Ramsay, J.D.F., Chem. Soc. Rev., 15 (1986) 335.
Martin, J.E. and Hurt, A.J., J. Appl. Cryst., 20 (1987) 61.
Jullien, R. and Botet, R., Aggregation and Fractal Aggregates, World Scientific, Singapore, 1987.
Wijnen, P.W.J.G., Beelen, T.P.M., Rummens, C.P.J., Saeijs, H.C.P.L., and van Santen, R.A., J. Appl. Cryst., 24 (1991) 759.
Dokter, W.H., van Garderen, H.F., Beelen, T.P.M., de Haan, J.W., van de Ven, L.J.M., and van Santen, R.A., Coll. Surf. A, 72 (1993) 165.
van Garderen, H.F., Pantos, E., Dokter, W.H., Beelen, T.P.M., and van Santen, R.A., accepted for publication in Model. Simul. in Mat. Sci. Eng.
Dokter, W.H., Beelen, T.P.M., van Garderen, H.F., and van Santen, R.A., Proc. IUPAC Symp. (COPS III), Marseille, May 9–12 1993.
Kallala, M., Jullien, R., and Cabane, B., J. Phys. II. France 2 (1992) 7.
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Pantos, E., West, J.B., Dokter, W.H. et al. Growth and aging phenomena in silica gels. J Sol-Gel Sci Technol 2, 273–276 (1994). https://doi.org/10.1007/BF00486255
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DOI: https://doi.org/10.1007/BF00486255