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 °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.
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Topuz, B., Çiftçioğlu, M. Preparation and characterization of diphasic sol-gel derived unsupported mullite membranes. J Sol-Gel Sci Technol 58, 6–11 (2011). https://doi.org/10.1007/s10971-010-2347-x
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DOI: https://doi.org/10.1007/s10971-010-2347-x