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Improvement of solvent exchange for supercritical dried aerogels

Schwan, Marina and Nefzger, Sarah and Zoghi, Behdad and Oligschleger, Christina and Milow, Barbara (2021) Improvement of solvent exchange for supercritical dried aerogels. Frontiers in Materials. Frontiers Media S.A.. doi: 10.3389/fmats.2021.662487. ISSN 2296-8016.

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Abstract

The solvent exchange as one of the most important steps during the manufacturing process of organic aerogels was investigated. This step is crucial as a preparatory step for the supercritical drying, since the pore solvent must be soluble in supercritical carbon dioxide to enable solvent extraction. The development and subsequent optimization of a suitable system with a peristaltic pump for automatic solvent exchange proved to be a suitable approach. In addition, the influence of zeolites on the acceleration of the process was found to be beneficial. To investigate the process, the water content in acetone was determined at different times using Karl Fischer titration. The shrinkage, densities, as well as the surface areas of the aerogels were analyzed. Based on these, the influence of various process parameters on the final structure of the obtained aerogels was investigated and evaluated. Modeling on diffusion in porous materials completes this study.

Item URL in elib:https://elib.dlr.de/141994/
Document Type:Article
Title:Improvement of solvent exchange for supercritical dried aerogels
Authors:
AuthorsInstitution or Email of AuthorsAuthor's ORCID iD
Schwan, MarinaUNSPECIFIEDhttps://orcid.org/0000-0001-6329-8164
Nefzger, SarahUNSPECIFIEDUNSPECIFIED
Zoghi, BehdadUNSPECIFIEDUNSPECIFIED
Oligschleger, ChristinaUNSPECIFIEDUNSPECIFIED
Milow, BarbaraUNSPECIFIEDhttps://orcid.org/0000-0002-6350-7728
Date:April 2021
Journal or Publication Title:Frontiers in Materials
Refereed publication:Yes
Open Access:Yes
Gold Open Access:Yes
In SCOPUS:Yes
In ISI Web of Science:Yes
DOI:10.3389/fmats.2021.662487
Publisher:Frontiers Media S.A.
ISSN:2296-8016
Status:Published
Keywords:solvent exchange, aerogels, Karl Fischer titration, supercritical drying, diffusion
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 - NGC Fahrzeugstruktur II
Location: Köln-Porz
Institutes and Institutions:Institute of Materials Research > Aerogels and Aerogel Composites
Deposited By: Schwan, Marina
Deposited On:29 Apr 2021 08:03
Last Modified:24 May 2022 23:47

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