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Gels 2015, 1(2), 276-290;

On the Size Effect of Gelation Kinetics in RF Aerogels

Institute of Materials Research, German Aerospace Center, DLR, 51170 Köln, Germany
Author to whom correspondence should be addressed.
Academic Editors: Francoise Quignard and Nathalie Tanchoux
Received: 26 October 2015 / Revised: 20 November 2015 / Accepted: 1 December 2015 / Published: 10 December 2015
(This article belongs to the Special Issue Aerogels)
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We experimentally and theoretically investigate the size effect of gelation using Resorcinol-Formaldehyde aerogels. We find a clear dependence of gelation time on the sample size under mild shear conditions. We developed a theoretical model based on Smoluchowski’s aggregation model adding, however, a growth term which accounts for the continuous growth of the colloidal particles while clustering happens. The model is solved analytically and agrees with our experimental observations for base catalyzed RF-gels. View Full-Text
Keywords: gelation; aerogels; shear flow; aggregation kinetics; size effect gelation; aerogels; shear flow; aggregation kinetics; size effect

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Ratke, L.; Hajduk, A. On the Size Effect of Gelation Kinetics in RF Aerogels. Gels 2015, 1, 276-290.

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