湿化学法制备高比表面积纳米氧化铝粉体  

Preparation of high specific surface area nano-alumina powders by wet chemical methods

作　　者：刘祥志[1] 朴玲钰[1] 鞠思婷[1] 杨磊[1] 张天慧[1] 毛立娟[1] 

机构地区：[1]国家纳米科学中心,北京100190

出　　处：《功能材料》2010年第7期1172-1175,共4页Journal of Functional Materials

基　　金：科技部重大研究计划资助项目(2006CB932600);国家自然科学基金面上资助项目(50602008);中科院院方向性资助项目(KJCX-YW-M03)

摘　　要：分别采用溶胶-凝胶法、超声-化学沉淀法、反相微乳液法合成了具有不同比表面积的纳米Al2O3粉体。采用TEM、HRTEM、SAED、XRD、比表面积分析等表征手段,分别对产物的形貌、结构、比表面积和孔容进行了表征和对比。纳米Al2O3粉体的比表面积为200～600m2/g(随合成方法和反应参数不同发生变化),均属γ-Al2O3,粒径均匀。考察了不同合成方法以及干燥方式对产物比表面积等物理性质的影响。结果表明,采用反相微乳液法结合真空冷冻干燥技术可以合成比表面积>500m2/g的纳米Al2O3粉体。Nano-alumina powders with different specific surface area were prepared by sol-gel,ultrasonic-chemical precipitation and reverse microemulsion method.The morphology,structure,specific surface area and pore volume of nano-alumina powders were characterized and compared by TEM,HRTEM,SAED,XRD and specific surface area analyzer.The specific surface area of the nano-alumina powders is in the range of 200-600m2/g （changing with different preparation methods） and the crystal structure is γ-Al2O3.The particle size is very uniform.The effects of different preparation methods and drying methods on the characteristics of the product were studied.The results indicate that the nano-alumina powders with specific surface area higher than 500m2/g can be prepared by vacuum freeze-drying process combining with reverse microemulsion method.

关 键 词：溶胶-凝胶 超声-化学沉淀 反相微乳液 Γ-AL2O3 比表面积 

分 类 号：O648[理学—物理化学] O612.3[理学—化学]