High specific surface area hybrid silica aerogel containing POSS
| Autor: | Zheng Zhou, Guangxin Chen, Jianyu Feng, Jiafei Ren, Linbin Wang, Qifang Li |
|---|---|
| Rok vydání: | 2021 |
| Předmět: |
Materials science
Supercritical drying Nucleation Aerogel 02 engineering and technology General Chemistry 010402 general chemistry 021001 nanoscience & nanotechnology Condensed Matter Physics 01 natural sciences Silsesquioxane 0104 chemical sciences Tetraethyl orthosilicate chemistry.chemical_compound Adsorption Chemical engineering chemistry Mechanics of Materials Specific surface area General Materials Science 0210 nano-technology Mesoporous material |
| Zdroj: | Microporous and Mesoporous Materials. 310:110456 |
| ISSN: | 1387-1811 |
| DOI: | 10.1016/j.micromeso.2020.110456 |
| Popis: | A UV-initiated thiol-ene click reaction was utilized to synthesize the multifunctional POSS-based silane coupling agent (OTS) from Octavinyl silsesquioxane (OVS) and 3-mercaptopropyltrimethoxysilane (MPTMS). Through supercritical drying, a series of hybrid aerogels with different OTS contents were successfully prepared by two-step sol-gel method using OTS and tetraethyl orthosilicate (TEOS) as the main precursors. In the formation of hybrid aerogels, the nucleation of OTS with flexible side chains had a significant effect on the size of the secondary particles and pore structure of aerogels. Compared with silica aerogels prepared from single TEOS, the hybrid aerogels had more uniform mesoporous and higher specific surface area. The result revealed all hybrid aerogels owned mesoporous structure (3–4 nm), low thermal conductivity (0.038–0.044 W m−1 K−1) and remarkable high specific surface area (945–1283 m2 g−1). The outstanding properties made hybrid aerogels promising as adsorbents or thermal insulation materials. |
| Databáze: | OpenAIRE |
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