Crystallization Behaviour of Nanostructured Hybrid SiO2-TiO2 Gel Glasses to Nanocomposites

resumo

The crystallization behaviour of hybrid SiO2-TiO2 nanocomposites derived from titanosiloxanes by sol-gel method has been investigated depending on the type of siloxane precursor and the pirolysis temperature. The resulting hybrid titanosiloxanes, crosslinked with trimethylsilil isocyanate (nitrogen-modified) or methyltrietoxisilane (carbon-modified), were pirolyzed in an inert atmosphere in the temperature range between 600 to 1100 degrees C in order to form C-(N)-Si-O-TiO2 nanocomposites. By means of XRD, FTIR, Si-29 NMR, SEM, TEM and AFM investigations have been established that the transformation of the nanostructured SiO2-TiO2 hybrid materials into nanocomposites as well as the crystalline size depend on the titanium content and the type of cross-linking agents used in the synthesizes.

palavras-chave

ORGANIC-INORGANIC NANOCOMPOSITES; SOL-GEL; SILICON OXYCARBIDE; POLYSILOXANE PRECURSORS; OXYNITRIDE GLASSES; POROUS MATERIALS; THIN-FILMS; CERAMICS; TIO2; SI

categoria

Chemistry; Science & Technology - Other Topics; Materials Science; Physics

autores

Tsvetelina, G; Yordanka, I; Yuliya, V; Miranda, SIM; Helena, FM

Grupos

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