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

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TOPUZ B., Ciftcioglu M.

JOURNAL OF SOL-GEL SCIENCE AND TECHNOLOGY, vol.58, no.1, pp.6-11, 2011 (SCI-Expanded) identifier identifier

  • Publication Type: Article / Article
  • Volume: 58 Issue: 1
  • Publication Date: 2011
  • Doi Number: 10.1007/s10971-010-2347-x
  • Journal Name: JOURNAL OF SOL-GEL SCIENCE AND TECHNOLOGY
  • Journal Indexes: Science Citation Index Expanded (SCI-EXPANDED), Scopus
  • Page Numbers: pp.6-11
  • Keywords: Diphasic gel, Mullite crystallization, Sol-gel, Unsupported ceramic membrane, SINGLE-PHASE GELS, STRUCTURAL EVOLUTION, SILICA MEMBRANES, MIXTURES, ALUMINA
  • Ankara University Affiliated: No

Abstract

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 A degrees C. Mullite formation was observed at a 100 A degrees 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.