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GELATION KINETICS: SIZE EFFECTS AND OTHER ISSUES

Ratke, Lorenz and Milwo, Barbara (2012) GELATION KINETICS: SIZE EFFECTS AND OTHER ISSUES. In: Proc. Seminar on Aerogels, p. 33. ISASF. Seminar on aerogels, 6.-7. Dez. 2012, 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/
Document Type:Conference or Workshop Item (Speech)
Title:GELATION KINETICS: SIZE EFFECTS AND OTHER ISSUES
Authors:
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Ratke, LorenzUNSPECIFIEDUNSPECIFIED
Milwo, BarbaraUNSPECIFIEDUNSPECIFIED
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:
EditorsEmail
Smirnova, I.TU-HH
Perrut, M.Separex
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 Dates:6.-7. Dez. 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:14 Dec 2012 12:38

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