| Issue |
J. Phys. IV France
Volume 02, Number C2, Octobre 1992
European Workshop on Glasses and Gels
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|---|---|---|
| Page(s) | C2-135 - C2-139 | |
| DOI | https://doi.org/10.1051/jp4:1992216 | |
European Workshop on Glasses and Gels
J. Phys. IV France 02 (1992) C2-135-C2-139
DOI: 10.1051/jp4:1992216
L.S.M.V. (URA 1119), Case Courrier 069, Université Montpellier II, Sciences et Techniques du Languedoc, Place E. Bataillon, 34095 Montpellier Cedex 5, France
© EDP Sciences 1992
J. Phys. IV France 02 (1992) C2-135-C2-139
DOI: 10.1051/jp4:1992216
From colloidal-silica sols to aerogels and xerogels
M. FORET, A. CHOUGRANI, R. VACHER and J. PELOUSL.S.M.V. (URA 1119), Case Courrier 069, Université Montpellier II, Sciences et Techniques du Languedoc, Place E. Bataillon, 34095 Montpellier Cedex 5, France
Abstract
By destabilization of quasi-monodisperse silica sols, fractal clusters can be obtained. Solvent evacuation gives a porous solid with fractal structure. Structural investigations of these colloidal aerogels by small-angle neutron scattering are presented, and compared to similar observations in concentrated sols and xerogels. An investigation of the vibrational modes of these materials by inelastic neutron scattering gives clear evidence of a strong non-Debye contribution in the low-frequency regime.
© EDP Sciences 1992