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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