Rutile formation in hydrothermally crystallized nanosized titania
- Swiss Federal Inst. of Tech., Lausanne (Switzerland). Inst. of Physical Chemistry
The present study shows that peptization aids in the anatase-rutile transformation in hydrothermally processed (250 C, 4,000 kPa) titania sols produced by the hydrolysis of alkoxide. HREM images show the presence of nanocrystals of 25--55 nm size. The anatase-rutile phase transformation in peptized titania is critically dependent on the conditions of hydrolysis such as the water/alkoxide concentration ratio and the size of the alkoxide. Hydrolysis of the ethoxide gave rise to a predominantly rutile phase whereas the isopropoxide and butoxide resulted in a predominantly anatase powder, under the same conditions of treatment. BET surface areas decrease from 107.1 to 68 m{sup 2}/g when the alkoxide is changed from tert-butoxide to ethoxide for a given water/alkoxide ratio.
- Sponsoring Organization:
- USDOE
- OSTI ID:
- 382469
- Journal Information:
- Journal of the American Ceramic Society, Journal Name: Journal of the American Ceramic Society Journal Issue: 8 Vol. 79; ISSN 0002-7820; ISSN JACTAW
- Country of Publication:
- United States
- Language:
- English
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