J. Phys. IV France 03 (1993) C8-353-C8-356
Small-angle scattering studies of freeze-dried silica gelsD. POSSELT1, E.D. EGEBERG2, J.S. PEDERSEN3 and K. MORTENSEN3
1 IMFUFA, Roskilde University, 4000 Roskilde, Denmark
2 Institute of Mineral Industry, The Technical University, 2800 Lyngby, Denmark
3 Department of Solid State Physics, Risø National Laboratory, 4000 Roskilde, Denmark
SAXS data for a series of five acid-catalysed freeze-dried silica gels are analysed within a mass-fractal model. It is found that the correlation length decreases with prolonged aging. The microstructure of the freeze-dried gels compares well with what is found for wet gels and aerogels.
© EDP Sciences 1993