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Light and super-insulating silica aerogel fibers by extrusion process

Meyer, Eva und Milow, Barbara und Fener, Resul (2017) Light and super-insulating silica aerogel fibers by extrusion process. Fifth Internationl Conference on Multifunctional, Hybrid and Nanomaterials, 2017-03-06 - 2017-03-10, Lissabon, Portugal.

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Kurzfassung

Silica aerogels are porous solid materials with high insulation poperties. Their open porous nanostructure inhibits diffusion and circulation-processes of air, which is one of the main reasons for thermal conductivity. Typically thermal conductivity values of silica aerogels are between 0.01 and 0.03 W/m*K (expanded polystyrene: 0.035 – 0.05 W/m*K). Silica aerogels are brittle and stiff like all the inorganic material (ceramics or glasses). Additionally, they easily brake under vibration and compressive stress. In order to give flexibility it is necessary to shape those materials into fibers with low diameter. Like glass and ceramic also silica aerogel fibers are flexible and can be processed into textile structures like fleece, which could withstand bending stress and vibration. Cellulose based aerogel fibres have already been produced and they show good results in terms of thermal insulation.1 However, cellulose decomposes at 200 °C. Silica aerogels enable temperatures around 600 °C and even more. Additionally, silica based fibres are resistant against the most common acids. The production of silica aerogel fibers and its textile processing is the aim of this research project. Aerogels are synthezised via sol-gel-process. The wet gel is put into an extruder to form fibers. After regeneration and drying with supercritical CO2 highly porous, nano-structured silica aerogel fibers are produced². The content of reaction partners, gelation time and reaction temperature are important parameters and affect the spinnability of the wet gel. Systematical experiments for spinning conditions are carried out. The effect of the process on the degree of viscosity, nano-structure formation and surface area are described. Aim of the project is to fiberize highly porous silica aerogels which have a high temperature resistance. Possible applications are extrem light thermal insulation material or filling material for different materials like concretes to improve thermal insulation.

elib-URL des Eintrags:https://elib.dlr.de/111556/
Dokumentart:Konferenzbeitrag (Vortrag)
Titel:Light and super-insulating silica aerogel fibers by extrusion process
Autoren:
AutorenInstitution oder E-Mail-AdresseAutoren-ORCID-iDORCID Put Code
Meyer, Evaeva.meyer (at) dlr.deNICHT SPEZIFIZIERTNICHT SPEZIFIZIERT
Milow, Barbarabarbara.milow (at) dlr.dehttps://orcid.org/0000-0002-6350-7728NICHT SPEZIFIZIERT
Fener, Resulresul.fener (at) dlr.deNICHT SPEZIFIZIERTNICHT SPEZIFIZIERT
Datum:März 2017
Referierte Publikation:Ja
Open Access:Nein
Gold Open Access:Nein
In SCOPUS:Nein
In ISI Web of Science:Nein
Status:veröffentlicht
Stichwörter:aerogel fiber, Spinning process, insulation
Veranstaltungstitel:Fifth Internationl Conference on Multifunctional, Hybrid and Nanomaterials
Veranstaltungsort:Lissabon, Portugal
Veranstaltungsart:internationale Konferenz
Veranstaltungsbeginn:6 März 2017
Veranstaltungsende:10 März 2017
HGF - Forschungsbereich:Luftfahrt, Raumfahrt und Verkehr
HGF - Programm:Verkehr
HGF - Programmthema:Bodengebundener Verkehr (alt)
DLR - Schwerpunkt:Verkehr
DLR - Forschungsgebiet:V BF - Bodengebundene Fahrzeuge
DLR - Teilgebiet (Projekt, Vorhaben):V - NGC Fahrzeugstruktur (alt)
Standort: Köln-Porz
Institute & Einrichtungen:Institut für Werkstoff-Forschung > Aerogele
Hinterlegt von: Meyer, Eva Helen
Hinterlegt am:20 Sep 2017 16:21
Letzte Änderung:24 Apr 2024 20:16

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