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Schwan, Marina and Ratke, Lorenz (2012) Flexible RF und carbon aerogels. In: Proc. Seminar on Aerogels, pp. 148-154. ISASF. Seminar on Aerogels, 6.-7.12.2012, Nancy, Frankreich. ISBN 978-2-905267-86-3
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Abstract
Organic resorcinol - formaldehyde (RF) aerogels dried under ambient conditions with a large resorcinol (R) to catalyst (C) ratio are usually hard and brittle with strength about 100 kPa and Young’s-moduli in the range of 1-2 MPa and densities in the range of 0.2 to 0.4 g/cm3. We observe that special conditions of aerogel preparation yield surprisingly flexible aerogels. They can be bent easily, similar to the well-known flexible silica aerogels. They have a low density about 0.06 g/cm3, a very low elastic modulus of around 70 kPa and are elastically deformable by more than 40% in an almost reversible manner. The thermal conductivity of these aerogels is around 0.046 W/(mK). The flexible RF-aerogel shows a continuous network of particles with sizes of around 1 µm and pores of about 10 µm. Carbonization of the flexible RF aerogels leads to flexible carbon aerogel pieces. This paper discusses the effect of resorcinol-water (R/W) molar ratio on the mechanical properties, pore structure and bulk density of flexible RF aerogels.
| Item URL in elib: | https://elib.dlr.de/79676/ | |||||||||
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| Document Type: | Conference or Workshop Item (Paper, Poster) | |||||||||
| Title: | Flexible RF und carbon aerogels | |||||||||
| 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: | pp. 148-154 | |||||||||
| Editors: |
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| Publisher: | ISASF | |||||||||
| Series Name: | Proc. ISASF | |||||||||
| ISBN: | 978-2-905267-86-3 | |||||||||
| Status: | Published | |||||||||
| Keywords: | RF aerogels, mechanical properties, flexibility | |||||||||
| Event Title: | Seminar on Aerogels | |||||||||
| Event Location: | Nancy, Frankreich | |||||||||
| Event Type: | Workshop | |||||||||
| Event Dates: | 6.-7.12.2012 | |||||||||
| 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 12:50 | |||||||||
| Last Modified: | 14 Dec 2012 12:50 |
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