Abstract
Tenuous gels of TiO2 are synthesized from titanium isopropoxide in a reverse micellar medium. The volume fraction of TiO2 in these gels is equal to 0.2%. The chemical and aggregative mechanisms are studied using 1H NMR, small-angle X-ray scattering, dynamic and static light scattering. The alkoxide hydrolysis occurs at the first stage of the gelation. Small clusters (70–80 A) are produced. The aggregation induces mass fractal structures with fractal dimensions depending on the solvent used in the synthesis: 1.4<Df<1.9. The interpretation of these results is based on interactions between the growing inorganic chains and the surfactant molecules.
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