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  4. Synthesis and characterization of mullite aerogels
 
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1992
Journal Article
Title

Synthesis and characterization of mullite aerogels

Abstract
A serious problem in the production of homogenous binary gels is the different reactivity of the alkoxides used. In the special case of silicon alkoxides and aluminium alkoxides, the difference is some orders of magnitude. A common procedure to decrease the reactivity is the complexation of the alkoxides by a chelating agent, e.g., ß-diketones. Particle formation in the system aluminium-sec-butylate-ß-diketone-TEOS in an alcoholic solution was studied by SAXS and IR spectoscopy to learn more about the effect of chelation. The most important effect of the chelating agent was shown to be the reduction of the number of possible condensation sites. Some gels were prepared and supercritically dried. Translucent aerogels were obtained under suitable hydrolysis conditions.
Author(s)
Raether, Friedrich  
Fraunhofer-Institut für Silicatforschung ISC  
Heinrich, Thomas
Fraunhofer-Institut für Silicatforschung ISC  
Fricke, Jochen
Tappert, W.
Journal
Journal of non-crystalline solids  
Language
English
Fraunhofer-Institut für Silicatforschung ISC  
Keyword(s)
  • Aerogel

  • Alkoxid

  • Methode

  • Reaktivität

  • sol-gel

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