Ratke, Lorenz and Milwo, Barbara (2012) GELATION KINETICS: SIZE EFFECTS AND OTHER ISSUES. In: Proc. Seminar on Aerogels, p. 33. ISASF. Seminar on aerogels, 2012-12-06 - 2012-12-07, Nancy, Frankreich. ISBN 978-2-905267-86-3.
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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 gel 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 very well, even quantitatively with our experimental observations for base catalyzed RF-gels. Applying the same model to describe gelation of acid catalyzed RF-aerogels yields also an excellent agreement for the gel-time dependence on catalyst concentration.
Item URL in elib: | https://elib.dlr.de/79683/ | ||||||||||||
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Document Type: | Conference or Workshop Item (Speech) | ||||||||||||
Title: | GELATION KINETICS: SIZE EFFECTS AND OTHER ISSUES | ||||||||||||
Authors: |
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Date: | December 2012 | ||||||||||||
Journal or Publication Title: | Proc. Seminar on Aerogels | ||||||||||||
Open Access: | No | ||||||||||||
Gold Open Access: | No | ||||||||||||
In SCOPUS: | No | ||||||||||||
In ISI Web of Science: | No | ||||||||||||
Page Range: | p. 33 | ||||||||||||
Editors: |
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Publisher: | ISASF | ||||||||||||
Series Name: | Proc. ISASF | ||||||||||||
ISBN: | 978-2-905267-86-3 | ||||||||||||
Status: | Published | ||||||||||||
Keywords: | gelation, aerogels, aggregation, growth | ||||||||||||
Event Title: | Seminar on aerogels | ||||||||||||
Event Location: | Nancy, Frankreich | ||||||||||||
Event Type: | Workshop | ||||||||||||
Event Start Date: | 6 December 2012 | ||||||||||||
Event End Date: | 7 December 2012 | ||||||||||||
HGF - Research field: | Aeronautics, Space and Transport | ||||||||||||
HGF - Program: | Transport | ||||||||||||
HGF - Program Themes: | Terrestrial Vehicles (old) | ||||||||||||
DLR - Research area: | Transport | ||||||||||||
DLR - Program: | V BF - Bodengebundene Fahrzeuge | ||||||||||||
DLR - Research theme (Project): | V - Projekt Neuartige Fahrzeugstrukturen (old) | ||||||||||||
Location: | Köln-Porz | ||||||||||||
Institutes and Institutions: | Institute of Materials Physics in Space | ||||||||||||
Deposited By: | Ratke, Prof. Lorenz | ||||||||||||
Deposited On: | 14 Dec 2012 12:38 | ||||||||||||
Last Modified: | 24 Apr 2024 19:46 |
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