Laskowski, Jessica and Milow, Barbara and Ratke, Lorenz (2015) Novel stiff aerogel-aerogel composites for thermal insulation applications. 20th International Conference on Composite Materials, 20.-24. Jul. 2015, Kopenhagen, Dänemark.
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Official URL: http://www.iccm20.org/
Abstract
Aerogels are suitable materials for ultralight thermal insulation due to their properties of very low thermal conductivity <0.02 W/mK and low density <0.1 g/cm³ as a result of a high porosity (up to 99%) and their nanostructure. However, they are usually fragile and tend to release dust. We investigated aerogel-aerogel composites to develop new materials with optimal properties adapted to the application. In our study we embedded two different kinds of highly insulating granular aerogels in cellulosic aerogel: hydrophilic silica aerogel (SiO2) and resorcinol-formaldehyde (RF) aerogel which were prepared by ourselves. In the first step a salt hydrate melt of 59 wt.-% Ca(SCN)2 with 2 wt.-% of cellulose from cotton linters is prepared at 110 °C. Between 0.8-3.8 wt.% of granular aerogel resulting in ≤36 vol.% of granular material in the aerogel-aerogel composite is directly mixed into the melt. The hot melt is filled into a vessel after the cellulose is completely dissolved. A wet cellulose gel forms while cooling and builds a nanofibrillar felt structure. The composite gels are aged and washed in ethanol and are dried supercritically with CO2. We obtained non-fragile materials with density about 0.06-0.17 g/cm³ and thermal conductivity about 0.036-0.044 W/mK. Compared to pure aerogels, embedding granular aerogel material into the structure of a cellulosic aerogel has a strong stiffening effect regarding the Young’s modulus.
Item URL in elib: | https://elib.dlr.de/97788/ | ||||||||||||
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Document Type: | Conference or Workshop Item (Speech, Other) | ||||||||||||
Additional Information: | Proceeding online veröffentlicht | ||||||||||||
Title: | Novel stiff aerogel-aerogel composites for thermal insulation applications | ||||||||||||
Authors: |
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Date: | July 2015 | ||||||||||||
Refereed publication: | No | ||||||||||||
Open Access: | No | ||||||||||||
Gold Open Access: | No | ||||||||||||
In SCOPUS: | No | ||||||||||||
In ISI Web of Science: | No | ||||||||||||
Status: | Published | ||||||||||||
Keywords: | Verbundwerkstoffe; Wärmedämmung | ||||||||||||
Event Title: | 20th International Conference on Composite Materials | ||||||||||||
Event Location: | Kopenhagen, Dänemark | ||||||||||||
Event Type: | international Conference | ||||||||||||
Event Dates: | 20.-24. Jul. 2015 | ||||||||||||
Organizer: | International Committee on Composite Materials (ICCM) | ||||||||||||
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: | Laskowski, Jessica | ||||||||||||
Deposited On: | 17 Sep 2015 07:35 | ||||||||||||
Last Modified: | 17 Sep 2015 07:35 |
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