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Size dependence of the gelation kinetics of RF gels: experiments and modeling

Ratke, Lorenz and Hajduk, Anna (2011) Size dependence of the gelation kinetics of RF gels: experiments and modeling. Workshop on Aerogel Applications, 30.9.2011, TU Hamburg-Harburg, Germany. (Unpublished)

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Abstract

The gelation time of resorcinol-formaldehyde-aerogels was measured as a function of sample size. Drops of different sizes were brought inside of a rotating roundflask, filled with hot liquid paraffin. The gelation process changed he appearance of the drops from initially transparent to smokey and white. The sudden change in optical transmission or opacity was identified as onset of gelation. The time of gelation was measured. The measurement results were compared to a theoretical model, based on M. Smoluchowski's coagulation theory, which describes the dependency of gelation time on drop volume. The experimental results agree with the theoretical prediction.

Document Type:Conference or Workshop Item (Speech)
Title:Size dependence of the gelation kinetics of RF gels: experiments and modeling
Authors:
AuthorsInstitution or Email of Authors
Ratke, LorenzUNSPECIFIED
Hajduk, AnnaUNSPECIFIED
Date:30 September 2011
Status:Unpublished
Keywords:Gelation, kinetics, mean field theory
Event Title:Workshop on Aerogel Applications
Event Location:TU Hamburg-Harburg, Germany
Event Type:international Conference, Workshop
Event Dates:30.9.2011
Organizer:German Russian Center of Multifunctional Materials
HGF - Research field:Aeronautics, Space and Transport
HGF - Program:Transport
HGF - Program Themes:Terrestrial Vehicles
DLR - Research area:Transport
DLR - Program:V BF - Bodengebundene Fahrzeuge
DLR - Research theme (Project):V - Neuartige Fahrzeugstrukturen (old)
Location: Köln-Porz
Institutes and Institutions:Institute of Materials Physics in Space
Deposited By: Prof. Lorenz Ratke
Deposited On:12 Dec 2011 13:13
Last Modified:12 Dec 2011 13:13

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