| 低密度、块状氧化铝气凝胶制备 | |
| Preparation of Low Density, Monolithic Alumina Aerogels | |
| 摘要: 研究了工艺参数对氧化铝溶胶及气凝胶的影响。结果表明，稳定的氧化铝溶胶优化制备工艺为：仲丁醇铝为前驱体，水解温度60 ℃，仲丁醇铝、乙醇、水的物质的量之比为1∶(8～16)∶1.2；螯合剂乙酰乙酸乙酯能有效控制仲丁醇铝水解缩聚速率，提高溶胶的稳定性；块状氧化铝气凝胶主要成份为多晶勃姆石相，比表面积为447 m2·g-1，其强度和密度随乙醇量的增加而降低，密度最低为0.040 g·cm-3。氧化铝气凝胶微观结构由许多片叶状颗粒堆积形成，经1 200 ℃热处理后仍保持原有的微观形貌，比表面积为73 m2·g-1。 | |
| 关键词: 氧化铝气凝胶 螯合剂 勃姆石 比表面积 | |
| 基金项目: | |
| Abstract: The effect of synthesis conditions on alumina sols and aerogels was investigated. The results show that a clear alumina sol is obtained by mixing aluminum tri-sec-butoxide(ASB), ethanol and water in a molar ratio of 1∶8～16∶1.2 and stirring at 60 ℃. The chelating reagent ethyl acetoacetate(Etac), which controls the hydrolysis and condensation of ASB, improves the stability of alumina sol. The monolithic alumina aerogel with well strength is composed of poly-crystallized boehmite, and the specific surface area is 447 m2·g-1. The strength and density of aerogels decrease with the increase of ethanol solvent, and the lowest density is 0.040 g·cm-3. The microstructure of alumina aerogel consists of randomly connected leaf-like particles. During calcination at 1 200 ℃, the aerogel still keeps the same porous textures and the surface area is 73 m2·g-1. | |
| Keywords: alumina aerogel chelating reagent boehmite surface area | |
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| 高庆福,张长瑞,冯 坚,武 纬,冯军宗,姜勇刚.低密度、块状氧化铝气凝胶制备[J].无机化学学报,2008,24(9):1456-1460. | |
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