气凝胶
材料科学
超临界干燥
环境压力
纳米孔
超临界流体
化学工程
立方氧化锆
金属
氧化物
溶胶凝胶
水解
复合材料
陶瓷
纳米技术
有机化学
冶金
工程类
化学
物理
热力学
作者
Uzma K.H. Bangi,Kyu‐Yeon Lee,Noor Mahmad N. Maldar,Hyung Ho Park
标识
DOI:10.1166/jnn.2019.16240
摘要
Metal oxide aerogels such as zirconia (ZrO₂), titania (TiO₂), and alumina (Al₂O₃) aerogels are very interesting nanoporous materials applicable as thermal insulators, catalysts, sensors, and so on. To obtain the aerogels, the first key step is a sol-gel process to prepare the gel followed by either supercritical drying, ambient pressure drying, or freeze-drying. Although the expensive and energy-intensive supercritical drying method restricts the commercialization of the aerogels, ambient pressure drying has shown great potential as an alternative and very simple method for aerogel synthesis. The sol-gel method and preparation parameters such as hydrolysis water, the silylating agent concentration, and the thermal treatment temperature have a profound impact on the textural and structural properties of the aerogels. Therefore, in this review, we study the synthesis and the influence of these parameters on the properties of metal oxide aerogels via ambient pressure drying.
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