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Flexible RF und carbon aerogels

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/
Document Type:Conference or Workshop Item (Paper, Poster)
Title:Flexible RF und carbon aerogels
Authors:
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Schwan, MarinaUNSPECIFIEDUNSPECIFIED
Ratke, LorenzUNSPECIFIEDUNSPECIFIED
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:
EditorsEmail
Smirnova, I.TU-HH
Perrut, M.Separex
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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