A procedure for the preparation of microporous titania membranes by the polymeric sol-gel technique is reported. The influence of acid/titanium ratio, water/titanium ratio, method of mixing components and refluxing time on particle size and sol stability was investigated. The thermal evolution, structural characteristics and liquid permeation properties of calcined materials were studied. Highly reproducible amorphous microporous titania layers with pore sizes le0.8 nm were obtained on both mesoporous gamma-alumina and titania/zirconia coated substrates. The upper limit of thermal stability of the amorphous phase is sim300°C. Higher calcination temperatures led to phase transformation into anatase, which was accompanied by a collapse of the microstructure. The material was found to be chemically stable in a wide pH interval.
|Number of pages||4|
|Journal||Journal of sol-gel science and technology|
|Publication status||Published - 2004|
- Polymeric sol