微乳液-共沸蒸馏法制备钛酸钡纳米粉体  

The preparation of nano barium titanate powder by microemulsion-azeotropic distillation method

作　　者：李凌峰[1] 纪箴[1] 张跃[1] 

机构地区：[1]北京科技大学材料物理与化学系,北京100083

出　　处：《功能材料》2006年第8期1314-1317,共4页Journal of Functional Materials

基　　金：国家杰出青年基金资助项目(50325209);国家自然科学重点基金资助项目(50232030);国家自然科学基金资助项目(50572005);教育部科学技术研究重点资助项目(104022)

摘　　要：以水/正辛烷/正己醇/司班80油包水体系中的微乳液滴为纳米反应器,通过微乳液滴中增溶的醋酸钡和油相中草酸酰化的钛酸四丁脂反应生成钛酸钡前驱体,并通过共沸蒸馏去除前驱体中的水分,以减小煅烧过程纳米钛酸钡粉体的团聚。实验结果表明,此方法制备的前驱体只需在550℃煅烧就可以生成钛酸钡晶粒,只需在600℃煅烧10min就可以得到粒径只有40nm左右的高纯立方钛酸钡纳米粉体,而且粉体具有粒度分布窄、形貌规则、优越的钛钡摩尔比、低团聚等优点。The water droplet in the microemulsion system of water/n-octane/n-hexanol/span80 can be seen as the nano reactors solubilizing barium acetate which react with tetrabutyl titanate acidating by axalic acid dissolved in oil phase to yield precursor of barium titanate. Then the system is evaporated to eliminate water by azeotropic distillation. Calcined at 550℃, the precursor can become brarium titanate crystalline grain and at 600℃. it＇s high pure tetragonal barium titanate nano-particle about 40nm. It is found that the powder combines the advantages of narrow size distribution, regular morphology, low agglomeration and strict Ba/Ti mole ratio.

关 键 词：微乳液 共沸蒸馏 纳米钛酸钡 团聚 

分 类 号：TM273[一般工业技术—材料科学与工程]