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Cellulose-Silica Aerogel Composites

Berkefeld, André and Schestakow, Maria (2016) Cellulose-Silica Aerogel Composites. In: Proceedings 3rd international seminar on aerogels, 3, p. 157. International Society for the Advandement of Supercritical Fluids. International Seminar on AEROGELS, 21-23. September 2016, Sophia Antipolis, Frankreich. ISBN 978-2-905267-93-1

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Abstract

Cellulose is the most abundant naturally occurring polymer and given this accessibility it is a highly promising resource in sustainable aerogel developments. Silica aerogels are characterized by a low thermal conductivity but still show insufficient mechanical properties like low stiffness and high brittleness. In the view of improving both the thermal properties of cellulose aerogels and the mechanical properties of silica aerogels, hybrids or composites are of a special interest. In that context, our present work deals with the development of cellulose-silica aerogel composites which were prepared using a "one-pot" process. Cellulose was dissolved using a salt hydrate melt based on cheap zinc chloride tetrahydrate and mixed with a silica sol based on tetraethylsilicate. The gelled cellulose-silica samples were regenerated in ethanol, dried with supercritical CO2 and characterized with respect to shrinkage, density, surface area, mechanical and thermal properties as well as micro-structure via SEM. The monolithic cellulose-silica composites are white in colour and apparently homogeneous. On visual examination the composites seem to get more robust, they feel stiffer and are easier to handle compared with the pure silica aerogels. The silica phase was shown to have a reinforcing effect on the cellulose aerogel by effectively increasing its Young's modulus. Furthermore, the resulting composites yield densities the range of 0.10–0.20 g/cm and specific surface areas in between 600 and 1000 m*m/g outlining an excellent combination of both original aerogels.

Item URL in elib:https://elib.dlr.de/106413/
Document Type:Conference or Workshop Item (Poster)
Title:Cellulose-Silica Aerogel Composites
Authors:
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Berkefeld, Andréandre.berkefeld (at) dlr.deUNSPECIFIED
Schestakow, Mariamaria.schestakow (at) dlr.deUNSPECIFIED
Date:22 September 2016
Journal or Publication Title:Proceedings 3rd international seminar on aerogels
Refereed publication:No
Open Access:No
Gold Open Access:No
In SCOPUS:No
In ISI Web of Science:No
Volume:3
Page Range:p. 157
Editors:
EditorsEmail
Smirnova, Irinairina.smirnova@tu-harburg.de
Perrut, Michelmperrut@separex.fr
Rigacci, Arnaudarnaud.rigacci@mines-paritech.fr
Budtova, Tatianatatiana.budtova@mines-paritech.fr
Publisher:International Society for the Advandement of Supercritical Fluids
Series Name:Proceedings
ISBN:978-2-905267-93-1
Status:Published
Keywords:Silica-Aerogel, Cellulose-Aerogel, Aerogel, Komposit-Aerogel
Event Title:International Seminar on AEROGELS
Event Location:Sophia Antipolis, Frankreich
Event Type:international Conference
Event Dates:21-23. September 2016
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 - NGC Fahrzeugstruktur (old)
Location: Köln-Porz
Institutes and Institutions:Institute of Materials Research > Aerogele
Deposited By: Berkefeld, Andre
Deposited On:04 Nov 2016 08:11
Last Modified:04 Nov 2016 08:11

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