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Novel stiff aerogel-aerogel composites for thermal insulation applications

Laskowski, Jessica and Milow, Barbara and Ratke, Lorenz (2015) Novel stiff aerogel-aerogel composites for thermal insulation applications. 20th International Conference on Composite Materials, 2015-07-20 - 2015-07-24, Kopenhagen, Dänemark.

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Official URL: http://www.iccm20.org/


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/
Document Type:Conference or Workshop Item (Speech, Other)
Additional Information:Proceeding online veröffentlicht
Title:Novel stiff aerogel-aerogel composites for thermal insulation applications
AuthorsInstitution or Email of AuthorsAuthor's ORCID iDORCID Put Code
Milow, BarbaraUNSPECIFIEDhttps://orcid.org/0000-0002-6350-7728UNSPECIFIED
Date:July 2015
Refereed publication:No
Open Access:No
Gold Open Access:No
In ISI Web of Science:No
Keywords:Verbundwerkstoffe; Wärmedämmung
Event Title:20th International Conference on Composite Materials
Event Location:Kopenhagen, Dänemark
Event Type:international Conference
Event Start Date:20 July 2015
Event End Date:24 July 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:24 Apr 2024 20:03

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