In-Situ SAXS Studies on the Formation of Silicate/Surfactant Mesophases with Solubilized Benzene under Acidic Conditions

The formation of mesoscopically ordered silica/surfactant composites under acidic synthesis conditions is studied by time-resolved in-situ small-angle X-ray scattering (SAXS) using synchrotron radiation. Benzene is used a an additive which acts as a weak swelling agent although most of the benzene m...

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Bibliographic Details
Published in:Langmuir 2002-12, Vol.18 (26), p.10053-10057
Main Authors: Tiemann, Michael, Goletto, Valérie, Blum, Raphaël, Babonneau, Florence, Amenitsch, Heinz, Lindén, Mika
Format: Article
Language:English
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Summary:The formation of mesoscopically ordered silica/surfactant composites under acidic synthesis conditions is studied by time-resolved in-situ small-angle X-ray scattering (SAXS) using synchrotron radiation. Benzene is used a an additive which acts as a weak swelling agent although most of the benzene molecules are found to reside near the surfactant/silicate interface region rather than in the micelle cores. With increasing relative amounts of benzene, the curvature of the micellar aggregates decreases, which finally leads to a transition from (hexagonally) rodlike to lamellar; a mechanism for this change in curvature is suggested.
ISSN:0743-7463
1520-5827
DOI:10.1021/la026473w