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Silica-Resorcinol-Melamine-Formaldehyde Composite Aerogels as High-Performance Thermal Insulators.
| Content Provider | Europe PMC |
|---|---|
| Author | Civioc, Romain Malfait, Wim J. Lattuada, Marco Koebel, Matthias M. Galmarini, Sandra |
| Copyright Year | 2022 |
| Abstract | Here, we report thegelation and supercritical drying of ethanol-basedsilica–resorcinol–melamine–formaldehyde (RMF)composite aerogels with relative concentrations of initial reagentsranging from neat silica to neat RMF alcogels. The as-prepared materialsare subsequently supercritically dried with carbon dioxide. Theirproperties include a thermal conductivity in the 15–20 mW·m–1·K–1 range even with a silicacontent as low as 20%wt. The possible reasons behind thisinteresting insulation performance and the mechanisms leading to theunderlying gel structure are discussed in depth. A focus is made onthe different gelation modes happening between the RMF and silicaphases, from a coating of silica surfaces with RMF species to discontinuousRMF particles within a silica backbone and a continuous RMF backbonewith isolated silica particles. The implications in terms of mechanicalproperties and thermal conductivity are elaborated upon. The initialratio of silica–RMF species in this ethanol-based synthesisaffects the micro- and macrostructure of the composites, resultingin materials with drastically different pore structures and thus aninteresting array of possibilities for a new class of silica-organiccomposite aerogels, based on a sol–gel process. |
| Journal | ACS Omega |
| Volume Number | 7 |
| PubMed Central reference number | PMC9088793 |
| Issue Number | 17 |
| PubMed reference number | 35557694 |
| e-ISSN | 24701343 |
| DOI | 10.1021/acsomega.1c04462 |
| Language | English |
| Publisher | American Chemical Society |
| Publisher Date | 2022-04-21 |
| Access Restriction | Open |
| Rights License | Permits the broadest form of re-use including for commercial purposes, provided that author attribution and integrity are maintained (https://creativecommons.org/licenses/by/4.0/). © 2022 The Authors. Published by American Chemical Society |
| Content Type | Text |
| Resource Type | Article |
| Subject | Chemistry Chemical Engineering |
