Heyer, Markus and Van Klaveren, Eva and Zimmermann, Lars and Vöpel, Pascal and Milow, Barbara (2022) Green synthesis route of Al2O3-SiO2 aerogels,possible alternative for the synthesis with propylene oxide. Sol Gel 2022 Lyon France, 2022-07-24 - 2022-07-29, Lyon, Frankreich.
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Abstract
Silica-alumina aerogels exhibit tremendous potential in high-temperature applications because of their excellent temperature stability at temperatures up to 1200°C. The synthesis of these aerogels is wellstudied using propylene oxide as a gelation initiator which is unfortunately toxic and carcinogenic. [1] Within this presentation we report on a new synthesis route which is developed to replace propylene oxide by non-toxic urea receiving silica-alumina gels. The gel bodies are dried under supercritical CO2 conditions to receive the aerogel. The route provides a significant advantage given their easy scalability. A systematic and conscious approach is followed to develop a green synthesis route for developing Al2O3-SiO2 aerogels. With the aim of improving the temperature stability of the Al2O3-SiO2 matrix, the molar ratios of urea, the type of solvent and the admixture of added metal oxides, such as ZrO2, are optimized. All aerogel variants are analyzed with respect to gelation, their density, porosity, internal surface area and thermal conductivity. Furthermore, the influence of heat treatment (25–1100°C) on the granular aerogels is investigated and additionally supported by X-ray powder diffraction, scanning electron microscopy and thermal analysis coupled with Fourier-Transform-Infrared (FT-IR) spectroscopy. In the contribution, all aspects concerning the importance of the careful examination on material parameters to ensure long term thermal stability will be presented. The results will be discussed and an outlook on potential applications will be demonstrated.
Item URL in elib: | https://elib.dlr.de/187750/ | ||||||||||||||||||||||||
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Document Type: | Conference or Workshop Item (Poster) | ||||||||||||||||||||||||
Title: | Green synthesis route of Al2O3-SiO2 aerogels,possible alternative for the synthesis with propylene oxide | ||||||||||||||||||||||||
Authors: |
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Date: | 25 July 2022 | ||||||||||||||||||||||||
Refereed publication: | Yes | ||||||||||||||||||||||||
Open Access: | Yes | ||||||||||||||||||||||||
Gold Open Access: | No | ||||||||||||||||||||||||
In SCOPUS: | No | ||||||||||||||||||||||||
In ISI Web of Science: | No | ||||||||||||||||||||||||
Status: | Published | ||||||||||||||||||||||||
Keywords: | Hybrid alumina-silica-based aerogel, high temperatur insulaton | ||||||||||||||||||||||||
Event Title: | Sol Gel 2022 Lyon France | ||||||||||||||||||||||||
Event Location: | Lyon, Frankreich | ||||||||||||||||||||||||
Event Type: | international Conference | ||||||||||||||||||||||||
Event Start Date: | 24 July 2022 | ||||||||||||||||||||||||
Event End Date: | 29 July 2022 | ||||||||||||||||||||||||
HGF - Research field: | Aeronautics, Space and Transport | ||||||||||||||||||||||||
HGF - Program: | Transport | ||||||||||||||||||||||||
HGF - Program Themes: | Road Transport | ||||||||||||||||||||||||
DLR - Research area: | Transport | ||||||||||||||||||||||||
DLR - Program: | V ST Straßenverkehr | ||||||||||||||||||||||||
DLR - Research theme (Project): | V - FFAE - Fahrzeugkonzepte, Fahrzeugstruktur, Antriebsstrang und Energiemanagement, V - NGC Fahrzeugstruktur II (old) | ||||||||||||||||||||||||
Location: | Köln-Porz | ||||||||||||||||||||||||
Institutes and Institutions: | Institute of Materials Research > Aerogels and Aerogel Composites | ||||||||||||||||||||||||
Deposited By: | Heyer, Markus | ||||||||||||||||||||||||
Deposited On: | 18 Aug 2022 08:21 | ||||||||||||||||||||||||
Last Modified: | 24 Apr 2024 20:49 |
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