气凝胶
材料科学
微球
多孔性
介孔材料
乳状液
环境压力
化学工程
介孔二氧化硅
比表面积
催化作用
复合材料
有机化学
化学
工程类
物理
热力学
作者
Qifeng Chen,Hui Wang,Luyi Sun
出处
期刊:Materials
[MDPI AG]
日期:2017-04-20
卷期号:10 (4): 435-435
被引量:19
摘要
Silica aerogel microspheres based on alkali silica sol were synthesized using the emulsion method. The experimental results revealed that the silica aerogel microspheres (4-20 µm in diameter) were mesoporous solids with an average pore diameter ranging from 6 to 35 nm. The tapping densities and specific surface areas of the aerogel microspheres are in the range of 0.112-0.287 g/cm³ and 207.5-660.6 m²/g, respectively. The diameter of the silica aerogel microspheres could be tailored by varying the processing conditions including agitation rate, water/oil ratio, mass ratio of Span 80: Tween 80, and emulsifier concentration. The effects of these parameters on the morphology and textural properties of the synthesized silica aerogel microspheres were systematically investigated. Such silica aerogel microspheres can be used to prepare large-scale silica aerogels at an ambient pressure for applications in separation and high efficiency catalysis, which requires features of high porosity and easy fill and recovery.
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