气凝胶
材料科学
化学工程
水解
铝
冷凝
比表面积
热稳定性
耐热性
无机化学
复合材料
催化作用
有机化学
化学
物理
工程类
热力学
作者
Xiao Dong Wang,Yulin Tian,Changming Yu,Lin Liu,Ze Zhang,Yu Wu,Jun Shen
标识
DOI:10.1016/j.ceramint.2022.02.287
摘要
Alumina aerogel has drawn a great research interest in the aerogel community owing to its great high-temperature heat resistance. The typical preparation can be divided into two approaches depending on the type of precursors. However, the alumina aerogel derived from organic aluminum alkoxides suffers from poor monolithic integrity, whereas the one from inorganic aluminum salts presents unsatisfied thermal stability. In this work, we develop a novel organic/inorganic double-precursor cross-linking method to prepare alumina aerogels. Aluminum chloride hexahydrate is used to provide an acid condition for the hydrolysis and condensation reaction of aluminum sec-butoxide (ASB), and serves as a reactant to co-condensate with the hydrolyzed ASB to form an interpenetrating chain structure. The resulting alumina aerogel exhibits a high specific surface area (SSA) of 667 m2/g and good high-temperature thermal insulation performance. Moreover, it can still retain SSA of 224 and 105 m2/g after heating at 1000 and 1300°C, respectively.
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