Synthesis of SiO2-Aerogel Inverse Opals in Supercritical Carbon Dioxide
| Autor: | Juan A. R. Renuncio, Eduardo Enciso, M. Carmen Carbajo, M.J. Torralvo, Albertina Cabañas, and Concepción Pando |
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| Rok vydání: | 2005 |
| Předmět: |
Materials science
Supercritical carbon dioxide General Chemical Engineering Aerogel General Chemistry law.invention Tetraethyl orthosilicate chemistry.chemical_compound Adsorption Benzenesulfonic acid Chemical engineering chemistry law Materials Chemistry Organic chemistry Particle Calcination Mesoporous material |
| Zdroj: | Chemistry of Materials. 17:6137-6145 |
| ISSN: | 1520-5002 0897-4756 |
| DOI: | 10.1021/cm051382g |
| Popis: | SiO2-aerogel inverse opals were produced for the first time in supercritical carbon dioxide (scCO2) with three-dimensional (3D) latex arrays as templates. The polymeric templates were reacted with tetraethyl orthosilicate in humidified scCO2 at 40 °C and 85 bar. After calcination of the template, highly porous materials replicating the structure of the original template were obtained. Polystyrene latex particles decorated with different hydrophilic groups were organized in 3D ordered arrays and used as templates. Particles were impregnated with benzenesulfonic acid, which activates the condensation process of silica precursors. Scanning and transmission electron microscopy (SEM and TEM) images showed that the reaction in scCO2 takes place only on the particle surface and that the octahedral and tetrahedral holes in the original fcc packing of latex spheres are empty. N2 adsorption isotherms showed broad adsorption−desorption loops characteristic of mesopores. Brunauer−Emmett−Teller (BET) surface areas are... |
| Databáze: | OpenAIRE |
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