Facile Preparation of Al2O3 Hollow Microspheres Via a Urea-mediated Precipitation Process

论文摘要

Al2O3 hollow microspheres without noticeable aggregation have been prepared via a facile templating route with urea-mediated precipitation. The precipitation process is different from the surfaceadsorption method which is confined to the adsorption capacity of the template surface. TEM and SEM images indicate that most of these Al2O3 hollow microspheres with shell thickness of tens of nanometers and diameters in a narrow range of 100-200 nm consist of a shell of closely packed nanoparticles. The optimal amount of H2 O and EtOH are 40 and 120 m L, respectively. The specific surface area, average pore size and pore volume of the Al2O3 hollow microspheres（calcinated at 600 ℃） are 328.52 m2/g, 17.496 nm and 1.985 cm3/g, respectively. As the calcination temperature increases from 600 to 1 100 ℃, the phase composition changes from γ-Al2O3 to θ-Al2O3 and a-Al2O3, and the surface morphology appears to change from a relatively rough surface formed by nanoparticles to a smooth surface formed by lamellar, which lead to the closure of pore channels and the reduction of specific surface.

论文目录

• 1 Introduction
• 2 Experimental
•   2.1 Synthesis route
•   2.2 Characterization
• 3 Results and discussion
•   3.1 TG-DTA analysis
•   3.2 Morphology analysis
•   3.3 Effects of the solvent on Al2O3 hollow microspheres syntheses
•   3.4 Effects of the calcination temperature on Al2O3 hollow microspheres syntheses
•   3.5 The mechanism analysis
• 4 Conclusions

文章来源

类型: 期刊论文

作者: 徐东,姜洪义,LI Ming,DONG Xuecheng,LUO Ting

来源: Journal of Wuhan University of Technology(Materials Science) 2019年03期

年度: 2019

分类: 工程科技Ⅰ辑

专业: 无机化工

单位: School of Materials Science and Engineering,Wuhan University of Technology,State Key Laboratory of Optical Fiber and Cable Manufacture Technology,Yangtze Optical Fibre and Cable Joint Stock Limited Company

分类号: TQ133.1

页码: 579-586

总页数: 8

文件大小: 1374K

下载量: 12