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.
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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/ | ||||||||||||
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Document Type: | Article | ||||||||||||
Title: | Reduction of shrinkage and brittleness for resorcinol-formaldehyde aerogels by means of a pH-controlled sol–gel process | ||||||||||||
Authors: |
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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 |
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