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

Creative Commons License

TOPUZ B., Ciftcioglu M.

JOURNAL OF SOL-GEL SCIENCE AND TECHNOLOGY, cilt.58, sa.1, ss.6-11, 2011 (SCI-Expanded) identifier identifier

  • Yayın Türü: Makale / Tam Makale
  • Cilt numarası: 58 Sayı: 1
  • Basım Tarihi: 2011
  • Doi Numarası: 10.1007/s10971-010-2347-x
  • Dergi Adı: JOURNAL OF SOL-GEL SCIENCE AND TECHNOLOGY
  • Derginin Tarandığı İndeksler: Science Citation Index Expanded (SCI-EXPANDED), Scopus
  • Sayfa Sayıları: ss.6-11
  • Anahtar Kelimeler: Diphasic gel, Mullite crystallization, Sol-gel, Unsupported ceramic membrane, SINGLE-PHASE GELS, STRUCTURAL EVOLUTION, SILICA MEMBRANES, MIXTURES, ALUMINA
  • Ankara Üniversitesi Adresli: Hayır

Özet

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.