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Water-regulated synthesis of Al2O3-SiO2 monolithic aerogel composites

Heyer, Markus und Vöpel, Pascal und Tannert, René und Milow, Barbara (2019) Water-regulated synthesis of Al2O3-SiO2 monolithic aerogel composites. Sol-Gel 2019, 25.08-30.08.2019, Russland,Sankt Petersburg.

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Kurzfassung

Alumina-based mixed metal oxide aerogels are well known for their thermal stability. They are typically prepared by controlled hydrolysis of metal alkyl esters, subsequent condensation, drying and heat treatment. Recent progress in the synthesis of pure alumina aerogels involved the hydrolysis of aluminum tri-sec-butoxide (ASB) using acetone and aniline thus releasing water in a defined manner [1, 2]. In that context, we investigated into the ASB route for the synthesis of mixed alumina silica aerogels alternatively to existing routes which are based on aluminum chloride (AlCl3) and tetraethyl ortho silicate (TEOS) [3]. Within these studies it was revealed that water is still present after hydrolysis of TEOS and hampers homogeneous gel formation by a simple subsequently addition of ASB. To overcome this issue, we developed a new method featuring the addition of (non-toxic) trimethyl orthoformate (TMOF) to the silica sol for an irreversible removal of water before ASB was added. The homogeneous gel bodies were dried under supercritical CO2 conditions. One mayor advantage of the new developed method is the avoidance of toxic reagent. Within the presentation we will report on systematic studies of synthesis to achieve monolithic aerogel samples with varied molar ratios of Al:Si and Al:Si:solvent and the aerogel materials properties received after characterization with respect to shrinkage, density, thermal conductivity, mechanical properties, as well as microstructure by SEM and TEM. Furthermore, the effect of heat treatment (800 – 1200 °C) on the monoliths will be illustrated, too. All these properties are critical issues for the design of thermally resistant materials used for mobile and semi-stationary applications in aeronautics, space, and the transportation sector.

elib-URL des Eintrags:https://elib.dlr.de/129298/
Dokumentart:Konferenzbeitrag (Poster)
Titel:Water-regulated synthesis of Al2O3-SiO2 monolithic aerogel composites
Autoren:
AutorenInstitution oder E-Mail-AdresseAutoren-ORCID-iDORCID Put Code
Heyer, Markusmarkus.heyer (at) dlr.dehttps://orcid.org/0000-0002-5180-0695NICHT SPEZIFIZIERT
Vöpel, PascalPascal.Voepel (at) dlr.dehttps://orcid.org/0000-0001-8233-7261NICHT SPEZIFIZIERT
Tannert, RenéRene.Tannert (at) dlr.dehttps://orcid.org/0000-0001-9484-8886NICHT SPEZIFIZIERT
Milow, BarbaraBarbara.Milow (at) dlr.dehttps://orcid.org/0000-0002-6350-7728NICHT SPEZIFIZIERT
Datum:27 August 2019
Referierte Publikation:Ja
Open Access:Nein
Gold Open Access:Nein
In SCOPUS:Nein
In ISI Web of Science:Nein
Status:veröffentlicht
Stichwörter:Al2O3-SiO2 aerogels, high temperature insulation, supercritical drying
Veranstaltungstitel:Sol-Gel 2019
Veranstaltungsort:Russland,Sankt Petersburg
Veranstaltungsart:internationale Konferenz
Veranstaltungsdatum:25.08-30.08.2019
HGF - Forschungsbereich:Luftfahrt, Raumfahrt und Verkehr
HGF - Programm:Verkehr
HGF - Programmthema:Straßenverkehr
DLR - Schwerpunkt:Verkehr
DLR - Forschungsgebiet:V ST Straßenverkehr
DLR - Teilgebiet (Projekt, Vorhaben):V - NGC Fahrzeugstruktur II (alt)
Standort: Köln-Porz
Institute & Einrichtungen:Institut für Werkstoff-Forschung > Aerogele und Aerogelverbundwerkstoffe
Hinterlegt von: Heyer, Markus
Hinterlegt am:06 Nov 2019 16:01
Letzte Änderung:06 Nov 2019 16:01

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