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RF-aerogels catalysed by ammonium carbonate
Reuß, Michael and Ratke, Lorenz (2010) RF-aerogels catalysed by ammonium carbonate. Journal of Sol-Gel Science and Technology, 53, pp. 85-92. DOI: 10.1007/s10971-009-2060-9.
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Official URL: http://springerlink.com/content/a1647k0577185233/?p=d98759613a4d43008829cdb4999d8beb&pi=3
Abstract
The application of ammonium carbonate (AC) as catalyst for the preparation of RF-aerogels leads to organic aerogels without metallic impurities in contrast to conventional catalysts like sodium carbonate. To synthesize the AC catalyzed RF aerogels we varied the catalyst and formaldehyde concentration in wide ranges. The nanostructure varies accordingly over an order of magnitude. The particle sizes in the dry aerogel network, determined by scanning electron microscopy, are in the range of 0.15–4 µm. The aerogel densities are in the range of 370– 420 kg m-3. The specific surface measured by nitrogen adsorption (BET) varies from 0.5 to 13 m2 g-1 which equals a specific surface area from 0.7 to 20 µm-1. Thermogravimetry is employed to study the drying process, annealing reactions and decomposition of the aerogel into a carbon aerogel.
| Document Type: | Article | ||||||
|---|---|---|---|---|---|---|---|
| Title: | RF-aerogels catalysed by ammonium carbonate | ||||||
| Authors: |
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| Date: | January 2010 | ||||||
| Journal or Publication Title: | Journal of Sol-Gel Science and Technology | ||||||
| Refereed publication: | Yes | ||||||
| In SCOPUS: | Yes | ||||||
| In ISI Web of Science: | Yes | ||||||
| Volume: | 53 | ||||||
| DOI: | 10.1007/s10971-009-2060-9 | ||||||
| Page Range: | pp. 85-92 | ||||||
| Status: | Published | ||||||
| Keywords: | Sol–gel, RF-aerogels, Subcritically drying , Ammonium carbonate | ||||||
| HGF - Research field: | Aeronautics, Space and Transport | ||||||
| HGF - Program: | Space | ||||||
| HGF - Program Themes: | W FR - Forschung unter Weltraumbedingungen | ||||||
| DLR - Research area: | Space | ||||||
| DLR - Program: | W FR - Forschung unter Weltraumbedingungen | ||||||
| DLR - Research theme (Project): | W - Vorhaben Materialwissenschaftliche Forschung | ||||||
| Location: | Köln-Porz | ||||||
| Institutes and Institutions: | Institute of Materials Physics in Space | ||||||
| Deposited By: | Prof. Lorenz Ratke | ||||||
| Deposited On: | 19 Feb 2010 08:13 | ||||||
| Last Modified: | 04 Apr 2013 16:20 |
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