elib
DLR-Header
DLR-Logo -> http://www.dlr.de
DLR Portal Home | Imprint | Privacy Policy | Contact | Deutsch
Fontsize: [-] Text [+]

Reduction of shrinkage and brittleness for resorcinol-formaldehyde aerogels by means of a pH-controlled sol–gel process

Tannert, René and Schwan, Marina and Ratke, Lorenz (2015) Reduction of shrinkage and brittleness for resorcinol-formaldehyde aerogels by means of a pH-controlled sol–gel process. The Journal of Supercritical Fluids (106), pp. 57-61. Elsevier. DOI: 10.1016/j.supflu.2015.06.021 ISSN 0896-8446

[img] PDF
1MB

Official URL: http://dx.doi.org/10.1016/j.supflu.2015.06.021

Abstract

Aerogels have attracted remarkable attention as porous low-density superinsulating material. However, they are typically brittle and tend to shrink during preparation or work-up preventing their use as a composite material. In that context, we have developed a sol-gel-process towards resorcinol-formaldehyde aerogels that includes a precise pH-adjustment at an early stage of the polymerization. As a result, less brittle analogues of Pekala aerogels were obtained that resemble Pekala gels in many aspects (skeletal density, porosity, thermal properties). However, significant differences were found in terms of inner surface area and compressive modulus, which are smaller for lower pH-values. Since pH-adjustment leads to minimal gel shrinkage, this sol-gel-process may be useful for the development of aerogel composites.

Item URL in elib:https://elib.dlr.de/98042/
Document Type:Article
Title:Reduction of shrinkage and brittleness for resorcinol-formaldehyde aerogels by means of a pH-controlled sol–gel process
Authors:
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Tannert, Renérene.tannert (at) dlr.dehttps://orcid.org/0000-0001-9484-8886
Schwan, Marinamarina.schwan (at) dlr.deUNSPECIFIED
Ratke, Lorenzlorenz.ratke (at) dlr.dehttps://orcid.org/0000-0003-2487-4717
Date:6 July 2015
Journal or Publication Title:The Journal of Supercritical Fluids
Refereed publication:Yes
Open Access:Yes
Gold Open Access:No
In SCOPUS:Yes
In ISI Web of Science:Yes
DOI :10.1016/j.supflu.2015.06.021
Page Range:pp. 57-61
Publisher:Elsevier
ISSN:0896-8446
Status:Published
Keywords:Aerogels Sol-Gel Process Shrinkage Density Compressive modulus Thermal conductivity
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: Tannert, Dr. René
Deposited On:17 Sep 2015 07:28
Last Modified:31 Jul 2019 19:54

Repository Staff Only: item control page

Browse
Search
Help & Contact
Information
electronic library is running on EPrints 3.3.12
Copyright © 2008-2017 German Aerospace Center (DLR). All rights reserved.