On the Size Effect of Gelation Kinetics in RF Aerogels.

Gels

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

Published: December 2015

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.

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http://www.ncbi.nlm.nih.gov/pmc/articles/PMC6318670PMC
http://dx.doi.org/10.3390/gels1020276DOI Listing

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