Transactions of the INDIAN CERAMIC SOCIETY Vol. 58 1999
Sol-Gel Titania Coating Precursors Having Different
Anatase-Rutile Transformation Temperature
S. RAJESH KUMAR, C. SURESH, AsHA K. VASUDEVAN, P. PERUMAL AND K. G. K. WARRIER
Pages : 118-121
DOI : 10.1080/0371750X.1999.10799883
Abstract
Titania catalysts have potential applications in synthesis and
decomposition of organic compounds, in waste-water treatment
and also as photo-electro and photo-chemical devices. Titania
coatings are also indicated to be effective as humidity sensors.
Anatase phase titania is believed to be preferentially effective in
light sensitive applications. Titania gel precursor has been prepared
by controlled hydrolysis of titanium isopropoxide in presence
of gel modifiers such as acetic acid and diethanolamine. The
resultant gel was dried and calcined at different temperatures
in the range 200° to l000°C. The dehydroxylation characteristics
of the gel and anatase to rutile transformation temperatures
are presented. The DEA modified precursor exhibits an anatase
to rutile transformation temperature of 600°C, while the acetic
acid modified one has a stable anatase phase even at 800°C.
