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Article Dans Une Revue Journal of Non-Crystalline Solids Année : 2004

Structural and textural study of the effects of metal ions on the densification kinetics of nanoporous silica xerogels

Résumé

Doped and undoped 50 Å porous silica xerogels were heated at 1050 °C for periods of 5 s to 4 h. Raman spectroscopy was used to follow the structural changes occurring at various stages of the gel-to-glass transformation as well as to investigate the effects of metal ions on the structure of nanoporous silica xerogels. Raman spectra and textural measurements using nitrogen-gas sorption showed that while the heat-treatment time required to obtain the final densified state is shortened by a factor of 80 for a material doped with Ag+ ions, in the case of Ce3+, the densification time is prolonged by 30%.

Dates et versions

hal-00269858 , version 1 (03-04-2008)

Identifiants

Citer

C. Kinowski, B. Capoen, L. L. Hench, Jean-Marie Nedelec, R. Bechara, et al.. Structural and textural study of the effects of metal ions on the densification kinetics of nanoporous silica xerogels. Journal of Non-Crystalline Solids, 2004, 345-346, pp.570-574. ⟨10.1016/j.jnoncrysol.2004.08.086⟩. ⟨hal-00269858⟩
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