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Gels 2015, 1(2), 276-290; doi:10.3390/gels1020276

On the Size Effect of Gelation Kinetics in RF Aerogels

Institute of Materials Research, German Aerospace Center, DLR, 51170 Köln, Germany
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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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Abstract

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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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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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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