Percolation of the organic phase in hybrid organic–inorganic aerogels

The properties (texture, mechanical behaviour, etc.) of hybrid organic–inorganic silica aerogels change dramatically when the concentration of the organic additive is varied from a given value. It has been known for several years that this critical concentration is around 40% of the total weight of...

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Bibliographic Details
Published in:Journal of sol-gel science and technology 2009-05, Vol.50 (2), p.170-175
Main Authors: Morales-Flórez, V., Toledo-Fernández, J. A., de la Rosa-Fox, N., Piñero, M., Esquivias, L.
Format: Article
Language:English
Subjects:
Ceramics
Chemistry
Chemistry and Materials Science
Colloidal gels. Colloidal sols
Colloidal state and disperse state
Composites
Exact sciences and technology
General and physical chemistry
Glass
Inorganic Chemistry
Materials Science
Mechanical properties
Nanotechnology
Natural Materials
Optical and Electronic Materials
Percolation
Porous materials
Silica aerogels
Silicon dioxide
Special Issue-Celebrating the 60th Anniversary of Professor David Avnir
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Summary:The properties (texture, mechanical behaviour, etc.) of hybrid organic–inorganic silica aerogels change dramatically when the concentration of the organic additive is varied from a given value. It has been known for several years that this critical concentration is around 40% of the total weight of silica present in the sample. We have made use of a new structural model to conclude that this concentration of 40% by weight corresponds to the percolation threshold of the organic phase.
ISSN:0928-0707
1573-4846
DOI:10.1007/s10971-008-1874-1