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CELLULOSE FIBER REINFORCED RF-AEROGELS

Laskowski, Jessica and Ratke, Lorenz (2012) CELLULOSE FIBER REINFORCED RF-AEROGELS. In: Proc. Seminar on aerogels, pp. 166-171. ISASF. Seminar on Aerogels, 6.-7. Dez. 2012, Nancy, Frankreich. ISBN 978-2-905267-86-3

Full text not available from this repository.

Abstract

Cellulose gels were synthesized in which the pore space was filled with resorcinol-formaldehyde (RF) aerogel solution. Three weight percent microcrystalline cellulose was dissolved in an aqueous calcium thiocyanate melt at 110 °C, which gelled on cooling building a nanofibrillar felt structure. The highly concentrated salt solution in the pore space is washed with ethanol until a test with Fe3+ ions does yield a colorless solution. After washing with formaldehyde (24%) the hydrogel was exposed to a resorcinol-formaldehyde solution while gelling. The RF solution had a molar ratio of resorcinol to water (R/W) of 0.04 and of resorcinol to formaldehyde (R/F) of 0.7. The molar ratio of resorcinol to catalyst sodium carbonate (R/C) used was 100, 500, 1000 or 1500. The composite gels prepared were dried supercritically and their nanostructure characterized by SEM. The aerogels were characterized by density, surface area, compression strength and thermal conductivity. Measurements of compression strength showed an anomalous behavior compared to those of pure cellulose aerogels.

Item URL in elib:https://elib.dlr.de/79680/
Document Type:Conference or Workshop Item (Paper, Poster)
Title:CELLULOSE FIBER REINFORCED RF-AEROGELS
Authors:
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Laskowski, JessicaUNSPECIFIEDUNSPECIFIED
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. 166-171
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-aerogel, cellulose aerogel, aerogel, composite
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 12:42
Last Modified:14 Dec 2012 12:42

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