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Erschienen in: Journal of Sol-Gel Science and Technology 3/2013

01.09.2013 | Original Paper

Sol–gel synthesis of macroporous TiO2 from ionic precursors via phase separation route

verfasst von: Wenyan Li, Xingzhong Guo, Yang Zhu, Yang Hui, Kazuyoshi Kanamori, Kazuki Nakanishi

Erschienen in: Journal of Sol-Gel Science and Technology | Ausgabe 3/2013

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Abstract

Monolithic macroporous titanium dioxide (TiO2) derived from ionic precursors has been successfully prepared via the sol–gel route accompanied by phase separation in the presence of formamide (FA) and poly(vinylpyrrolidone) (PVP). The addition of FA promotes the gelation, whereas PVP enhances the polymerization-induced phase separation. Appropriate choice of the starting compositions allows the production of cocontinuous macroporous TiO2 monoliths in large dimensions, and controls the size of macropores. The resultant dried gel is amorphous, whereas anatase and rutile phases are precipitated at 500 and 900 °C respectively, without spoiling the macroporous morphology. Nitrogen adsorption–desorption measurements revealed that the dried gels exhibits mesostructure with a median pore size of about 3 nm and BET surface area of 228 m2/g, whereas 15 nm and 73 m2/g for the gels calcined at 600 °C.

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Metadaten
Titel
Sol–gel synthesis of macroporous TiO2 from ionic precursors via phase separation route
verfasst von
Wenyan Li
Xingzhong Guo
Yang Zhu
Yang Hui
Kazuyoshi Kanamori
Kazuki Nakanishi
Publikationsdatum
01.09.2013
Verlag
Springer US
Erschienen in
Journal of Sol-Gel Science and Technology / Ausgabe 3/2013
Print ISSN: 0928-0707
Elektronische ISSN: 1573-4846
DOI
https://doi.org/10.1007/s10971-013-3123-5

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