Facile fabrication of machinable low-density moisture-resistant silica aerogels
| Autor: | Jiayi Zhu, Hongbo Ren, Yutie Bi |
|---|---|
| Rok vydání: | 2018 |
| Předmět: |
Materials science
Fabrication Moisture Mechanical Engineering Supercritical drying 02 engineering and technology 010402 general chemistry 021001 nanoscience & nanotechnology 01 natural sciences 0104 chemical sciences Catalysis Volume (thermodynamics) Chemical engineering Mechanics of Materials Impurity Low density General Materials Science 0210 nano-technology Shrinkage |
| Zdroj: | Journal of Porous Materials. 26:399-407 |
| ISSN: | 1573-4854 1380-2224 |
| Popis: | Low-density moisture-resistant silica aerogels with enhanced mechanical strength were obtained by combining with the aging of the teteraehoxysilane (TEOS)-based alcogels in the TEOS/ethanol solution and the modification in the hexamethyldisilazane (HMDS)/ethanol solution. This route introduced less organic impurities into as-prepared aerogels and their mechanical strength was also enhanced. The linear volume shrinkage of the modified wet gels reached as low as 3.6% during supercritical drying. Thus, the aerogels had appropriate mechanical strength to be adapted the requirements of applications with various shapes. Moreover, the densities of silica aerogels maintained stable after modification by high concentration HMDS, suggesting excellent moisture resistance. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|
Full text from SpringerLink