Organic/inorganic double-precursor cross-linked alumina aerogel with high specific surface area and high-temperature resistance
Organic/inorganic double-precursor cross-linked alumina aerogel with high specific surface area and high-temperature resistance
复制标题
高比表面积耐高温有机/无机双前驱体交联氧化铝气凝胶
DOI：
10.1016/j.ceramint.2022.02.287
复制
发表时间：
2022-04-29
影响因子：
5.2
通讯作者：
Shen, Jun
中科院分区：
文献类型：
--
作者：
Wang, Xiaodong;Tian, Yulin;Shen, Jun
氧化铝气凝胶由于其良好的高温耐热性，在气凝胶领域引起了极大的研究兴趣。根据前体的类型，典型的制备可分为两种方法。然而，由有机铝醇盐制备的氧化铝气凝胶整体性较差，而由无机铝盐制备的氧化铝气凝胶热稳定性较差。本论文提出了一种新型的有机/无机双前驱体交联法制备氧化铝气凝胶。六水合氯化铝用于为仲丁醇铝（ASB）的水解和缩合反应提供酸性条件，并作为反应物与水解的ASB共缩合以形成互穿链结构。所得氧化铝气凝胶具有667 m2/g的高比表面积（SSA）和良好的高温隔热性能。此外，在1000和1300 ℃下加热后，它仍然可以分别保持224和105 m（2）/g的SSA。
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 m(2)/g and good high-temperature thermal insulation performance. Moreover, it can still retain SSA of 224 and 105 m(2)/g after heating at 1000 and 1300 degrees C, respectively.