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Effect of water and hydrolysis catalyst on the crystal structure of nanocrystalline TiO2powders prepared by sol-gel method

✍ Scribed by Juengsuwattananon, K. ;Jaroenworaluck, A. ;Panyathanmaporn, T. ;Jinawath, S. ;Supothina, S.

Publisher
John Wiley and Sons
Year
2007
Tongue
English
Weight
709 KB
Volume
204
Category
Article
ISSN
0031-8965

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✦ Synopsis

Abstract

TiO~2~ powders were synthesized by a sol–gel method from tetrabutyl orthotitanate solution in the presence of water and hydrochloric acid. In order to study the effect of water content and hydrolysis catalyst (HCl) on crystal structure of the TiO~2~, a composition of H~2~O:EtOH:HCl was varied to 1:3:1, 1.5:1.5:2, 2:2:1 and 3:1:1. An increase of water and hydrochloric acid content in the precursor led to faster sol formation and greater yield of the TiO~2~ particle. Both water and hydrochloric acid were also found to promote the formation of rutile phase. Very fine spherical anatase and rutile crystals were obtained from the precursor containing small amount of water, while much larger needle‐shaped pure rutile was obtained when the precursor contained high amount of water. It was shown that phase composition can be monitored by easy manipulation of basic synthesis parameters such as the amount of water and acid catalyst. (Β© 2007 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)

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