Numéro
J. Phys. IV France
Volume 03, Numéro C8, Décembre 1993
IX International Conference on Small Angle Scattering
Page(s) C8-353 - C8-356
DOI http://dx.doi.org/10.1051/jp4:1993872
IX International Conference on Small Angle Scattering

J. Phys. IV France 03 (1993) C8-353-C8-356

DOI: 10.1051/jp4:1993872

Small-angle scattering studies of freeze-dried silica gels

D. 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


Abstract
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