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Improvement of Solvent Exchange for Supercritical Dried Aerogels

  • 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.

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Document Type:Article
Author:Marina Schwan, Sarah Nefzger, Behdad Zoghi, Christina Oligschleger, Barbara Milow
Parent Title (English):Frontiers in Materials
Article Number:662487
Number of pages:13
Publisher:Frontiers Media
Place of publication:Lausanne
Publishing Institution:Hochschule Bonn-Rhein-Sieg
Date of first publication:2021/04/09
Copyright:Copyright © 2021 Schwan, Nefzger, Zoghi, Oligschleger and Milow. This is an openaccess article distributed under the terms of the Creative Commons Attribution License (CC BY).
Funding Information:This work was funded by the DLR internal project “Next Generation Car.”
Keyword:Karl Fischer titration; aerogels; diffusion; solvent exchange; supercritical drying
Departments, institutes and facilities:Fachbereich Angewandte Naturwissenschaften
Dewey Decimal Classification (DDC):6 Technik, Medizin, angewandte Wissenschaften / 62 Ingenieurwissenschaften / 620 Ingenieurwissenschaften und zugeordnete Tätigkeiten
Entry in this database:2021/04/29
Licence (German):License LogoCreative Commons - CC BY - Namensnennung 4.0 International