Al₂O₃纳米粉的湿化学法制备及其形貌控制工艺

Al 2 O 3 纳米粉的湿化学法制备及其形貌控制工艺 Preparation of Al 2 O 3 Nanoparticles by Wet Chemical Method and Its Morphology Controlling Conditions 吴志国 WU Zhiguo 1 first-author 吕红金 Lu Hongjin 1 彭天右 PENG Tianyou 1 武汉大学化学与分子科学学院 武汉大学化学与分子科学学院 College of Chemistry and Molecular Sciences,Wuhan University College of Chemistry and Molecular Sciences,Wuhan University 以Al2（SO4）3.18H2O和NH3.H2O为原料,采用湿化学沉淀法制备了-γAl2O3纳米粉,探讨了制备条件和后处理工艺对粉体形貌、粒径分布和团聚状况的影响.结果表明:Al3+浓度为0.8 mol.L-1,氨水pH值为12.0时,可获得粒径为10 nm左右的-γAl2O3纳米粉;聚乙二醇2000可以促使粉体的粒径分布均匀化和抑制颗粒间团聚体的形成;以正丁醇和正己醇的混合溶剂进行异相共沸蒸馏能有效脱除水份和减小干燥过程中的毛细管力,从而获得疏松的前驱体,经900℃煅烧后即得到粒径分布较窄、基本无硬团聚的-γAl2O3纳米粉. Using Al2（SO4）3·18H2O and NH3·H2O as the starting materials,γ-Al2O3 nanoparticles were prepared by wet chemical precipitation process.The effects of reaction conditions and post-treatment techniques on the morphologies,particle size distribution,and agglomeration status of Al2O3 nanoparticles were investigated.The results show that the particle size of γ-Al2O3 is about 10 nm when using 0.8 mol·L-1 Al3+ solution and the ammonia with pH 12.0 as reactants.PEG 2000 can promote the uniformization of the particle size and restrain the formation of agglomerations among the nanoparticles.Heterogeneous azeotropic distillation processing with the mixed solvent of n-butanol and n-hexanol can dehydrate effectively and eliminate the capillary forces during the drying procedure,and then promote the formation of loose precursors and Al2O3 nanoparticles with narrow particle size distributions and less hard-agglomerations after calcination at 900 ℃. 纳米氧化铝 湿化学法 异相共沸蒸馏 团聚体 alumina nanoparticle wet chemical method heterogeneous azeotropic distillation agglomerations TB383.1 湖北省重大科技专项基金（2005AA105A01）资助项目 2008-06-01 2021-04-01 6 54