Monolithic Gels of Silica and Nonionic Surfactant: Matrices for the Dispersion of Metal Ions |
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| Authors: | B. Ammundsen G.R. Burns D.J. Jones J. Rozière |
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| Affiliation: | (1) Department of Chemistry, Victoria University of Wellington, P.O. Box 600, Wellington, New Zealand;(2) Laboratoire des Agrégats Moléculaires et Matériaux Inorganiques, URA CNRS 79, Université Montpellier 2, Place Eugène Bataillon, 34095 Montpellier Cédex 5, France |
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| Abstract: | The formation of homogeneous monolithic gels by the addition of TEOS to acidic amphiphilic solutions has been investigated for a range of nonionic surfactants, and the relationships between solution composition and gelation examined. Using the surfactant solutions as a means of pre-doping the matrices with high concentrations of manganese nitrate gave gels which could be calcined to 400°C with little or no segregation of manganese oxide observed by X-ray diffraction. X-ray absorption spectroscopy has shown that the ligand environment of manganese in the silica-surfactant matrices differs from that in gels derived from ethanol solutions, and that most of the manganese in the calcined gels remains in a disordered environment. |
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| Keywords: | silica monoliths nonionic surfactant manganese EXAFS XANES |
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