UV absorption of titanium oxide based gels |
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| Affiliation: | 1. Institute of Applied Physics RAS, Nizhnii Novgorod 603950, Russia;2. Laboratoire d’Ingénierie des Matériaux et des Hautes Pressions, C.N.R.S., Institut Galilée, Univerité Paris-Nord, Villetaneuse 93430, France;1. Faculty of Chemistry, Nicolaus Copernicus University, 87-100 Torun, Poland;2. Institute of Low Temperature and Structure Research PAN, 50-422 Wroclaw, Poland;3. Faculty of Science, Kuwait University, PO Box 5969 Safat, Kuwait 13060, Kuwait;1. Dipartimento di Chimica e Centro Interdipartimentale NIS (Nanostructured Surfaces and Interfaces), Università di Torino, Via Pietro Giuria 7, Torino, 10125, Italy;2. Istituto Nazionale di Ricerca Metrologica (INRIM), Str. delle Cacce, 91, Torino, 10135, Italy;3. Leibniz- Institut für Festkörper- und Werkstoffforschung (IFW), Helmholtzstraße 20, Dresden, 01069, Germany;1. Dipartimento di Chimica e Centro Interdipartimentale NIS (Nanostructured Surfaces and Interfaces), Università di Torino, Via Pietro Giuria 7, 10125, Torino, Italy;2. Leibniz Institut für Festkörper- und Werkstoffforschung IFW, Helmholtzstraße 20, 01069, Dresden, Germany;1. Département de Chimie, Université de Montréal, Montréal, Québec H3C 3J7, Canada;2. Department of Chemistry, Durham University, Durham DH1 3LE, UK;3. Department of Chemistry, Queen’s University, Kingston, Ontario K7L 3N6, Canada;4. Department of Chemistry, University of Cincinnati, P.O. Box 210172, Cincinnati, OH 45221-0172, United States |
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| Abstract: | A spectroscopic study of the gelation and aging of the titanium oxide based gels has been carried out. A careful analysis of measured spectra has shown a permanent growth of the UV absorption in the spectral range of hν⩾Ethr=3.24 eV during all the period of observations. The absorption saturates at times much longer than the gelation time. The observed kinetics is discussed in terms of short oxo-polymer chains nucleation, formation of the primary gel, and gel mass increase under aging. Simple basic models relating the absorption growth to the accumulation of polymeric units successfully fit the experimental curve. The observations suggest using the UV absorption for control of the gel formation. |
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