J. Phys. IV France 03 (1993) C8-393-C8-396
Small angle scattering study of silica gels and zeolitesT.P.M. BEELEN1, W.H. DOKTER1, H.F. VAN GARDEREN1, R.A. VAN SANTEN1 and E. PANTOS2
1 Eindhoven University of Technology, P.O. Box 513, 5600 MB Eindhoven, The Netherlands
2 SRS Daresbuly Laboratory, Warrington, U.K.
Silica hydrogels show fractal properties corresponding with DLCAA or RLCCA. During aging silica is redistributed, resulting in reinforcement of the tenuous structure and only slightly disturbing fractal geometry. In zeolitic precursors no mass-fractals are present, but SAXS spectra show strong indications for the presence of surface-fractals. Computer simulations do confirm the experimental results.
© EDP Sciences 1993