Preparation of FexOy/SiO2 nanocomposites by thermal decomposition of some carboxylate precursors formed inside the silica matrix |
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| Authors: | Oana ?tef?nescu Corneliu Davidescu Mircea ?tef?nescu and Marcela Stoia |
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| Institution: | (1) Faculty of Industrial Chemistry and Environmental Engineering, University “Politehnica” of Timisoara, P-ta Victoriei nr. 2., 300006 Timisoara, Romania;(2) Faculty of Physics, West University of Timisoara, Bv. V. Parvan no. 4, 300223 Timisoara, Romania |
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| Abstract: | In this paper we present a study regarding the obtaining of iron oxides embedded in silica matrix, using a modified sol-gel
method. This method consists in the formation, inside the silica matrix, of some Fe(III)-carboxylate compounds, resulted in
the redox reaction between Fe(NO3)3 and diol.
We have synthesized four gels, starting from tetra-ethyl orthosilicate, Fe(NO3)3·9H2O and different diols: ethylene glycol, 1,2-propanediol, 1,3-propanediol and 1,4-butanediol, for a final composition 50% Fe2O3/50% SiO2. The obtained gels have been thermally treated at 130°C, when the redox reaction Fe(NO3)3-diol took place with formation of the precursors in the xerogels pores. The thermal decomposition of all four precursors
took place up to 300°C. |
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