正硅酸乙酯
勃姆石
材料科学
收缩率
复合数
摩尔比
化学工程
相(物质)
复合材料
铝
催化作用
纳米技术
有机化学
化学
工程类
作者
Yulin Tian,Xiaodong Wang,Yu Wu,Xiaoxue Zhang,Chun Li,Yijun Wang,Jun Shen
出处
期刊:Molecules
[Multidisciplinary Digital Publishing Institute]
日期:2023-03-17
卷期号:28 (6): 2743-2743
被引量:4
标识
DOI:10.3390/molecules28062743
摘要
Monolithic Al2O3-SiO2 composite aerogels were synthesized by using inexpensive aluminum chloride hexahydrate (AlCl3·6H2O) and tetraethyl orthosilicate (TEOS). By adjusting the molar ratio of Al and Si, the best ratio of high-temperature resistance was found. The resultant aerogels (Al:Si = 9:1) exhibit high thermal performance, which can be identified by the low linear shrinkage of 5% and high specific surface area (SSA) of 283 m2/g at 1200 °C. Alumina in these aerogels mainly exists in the boehmite phase and gradually transforms into the θ-Al2O3 phase in the process of heating to 1200 °C. No α-Al2O3 is detected in the heating process. These Al2O3-SiO2 composite aerogels are derived from a simple, low-priced and safe method. With their high thermal performance, these aerogels will have a wide application in high-temperature field.
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