Structural and morphological evolution during pyrolysis of sol-gel derived glasses in the Si-O-C-N-Ti system

resumo

Si-Ti oxycarbonitride glasses are obtained for the first time by pyrolysis of sol-gel derived di-urethanesil-titania hybrid materials. Tetramethoxysilane, trimethylsilyl isocyanate and titanium tetraisopropoxide are used as precursors for the sol-gel process. The structural and morphological evolution of the hybrid materials during pyrolysis have been followed by means of XRD, FTIR, Si-29 CP MAS NMR, SEM and AFM investigations. It was found that the structural rearrangement of the siloxane moiety after pyrolysis produces mesoporous materials. The structure of these materials depends on the heat treatment temperature.

palavras-chave

HYBRID; NANOCOMPOSITES

categoria

Chemistry; Materials Science

autores

Ivanova, Y; Gerganova, T; Dimitriev, Y; Salvado, I; Fernandes, M; Wu, A

nossos autores

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