Preparation and characterization of diphasic sol-gel derived unsupported mullite membranes

Diphasic gels prepared by mixing freshly prepared polymeric silica and polymeric boehmite sols through a modified Al-alkoxide route in mullite compositions led to the crystallization of mullite upon heat treatment at 775 °C. Mullite formation was observed at a 100 °C higher temperature when diphasic...

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Veröffentlicht in:	Journal of sol-gel science and technology 2011-04, Vol.58 (1), p.6-11
Hauptverfasser:	Topuz, Berna, Çiftçioğlu, Muhsin
Format:	Artikel
Sprache:	eng
Schlagworte:	Boehmite Ceramics Chemistry Chemistry and Materials Science Colloidal gels. Colloidal sols Colloidal state and disperse state Composites Crystallization Exact sciences and technology Gels General and physical chemistry Glass Heat treatment Inorganic Chemistry Materials Science Membranes Mullite Nanotechnology Natural Materials Optical and Electronic Materials Original Paper Silicon dioxide Sol-gel processes Sols
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Zusammenfassung:	Diphasic gels prepared by mixing freshly prepared polymeric silica and polymeric boehmite sols through a modified Al-alkoxide route in mullite compositions led to the crystallization of mullite upon heat treatment at 775 °C. Mullite formation was observed at a 100 °C higher temperature when diphasic gels were formed by mixing aged polymeric sols containing about 2 nm in diameter boehmite species. These relatively low mullite formation temperatures were attributed to the nanoscale sizes of the polymeric species of the two amorphous phases present in the diphasic gels.
ISSN:	0928-0707 1573-4846
DOI:	10.1007/s10971-010-2347-x