Role of Urea in the Preparation of Highly Porous Nanocomposite Aerogels
- 21 February 2007
- journal article
- Published by American Chemical Society (ACS) in Langmuir
- Vol. 23 (7) , 3509-3512
- https://doi.org/10.1021/la0635799
Abstract
The preparation of highly porous CoFe2O4−SiO2 nanocomposite aerogels was successfully achieved by a novel sol−gel procedure involving urea-assisted co-gelation of the precursor phases. This method allows fast gelation, giving rise to an aerogel with 97% porosity. The formation of CoFe2O4 nanocrystals homogeneously distributed within the matrix occurs after calcination at 750 °C and is complete at 900 °C. Despite the high temperature required for the formation of the CoFe2O4 nanocrystals, the high porosity typical of aerogels is still retained.Keywords
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