Preparation of hollow alumina nanospheres via surfactant-assisted flame spray pyrolysis  

作　　者：Yanjie Hu Hongqiu Ding Chunzhong Li 

机构地区：[1]Key Laboratory for Ultrafine Materials of Ministry of Education, School of Materials Science and Engineering, East China University of Science ＆ Technology, Shanghai 200237, China

出　　处：《Particuology》2011年第5期528-532,共5页颗粒学报（英文版）

基　　金：supported by the National Natural Science Foundation of China (20925621, 20706015, 50703009, 20906027,20906021, 20976054, and 20973059);the Program of Shanghai Subject Chief Scientist (08XD1401500);the Shanghai Shuguang Scholars Tracking Program (08GG09);the Shanghai Rising-Star Program (09QH1400700 and 09QA1401500);the Special Projects for Key Laboratories in Shanghai (09DZ2202000);the Special Projects for Nanotechnology of Shanghai (0852nm02000,0952nm02000, and 0952nm02100);the Shanghai Pujiang Program (09PJ1403200)

摘　　要：Hollow A1203 nanospheres with well-defined structure and shape were successfully prepared via flame spray pyrolysis （FSP） in the presence of a surfactant as droplet stabilizer. The morphology and structure of the nanospheres were systematically characterized by transmission electron microscopy, scanning electron microscopy, and N2 sorption. A solution of hydrated aluminum nitrate, polyethylene glycol （PEG） and absolute ethanol was sprayed into a flame to transform droplets into particles after evaporation and surface nucleation, forming hollow AI203 nanospheres from aluminum nitrate decomposition. The surfactant was found effective in producing smaller droplets because of decreased surface tension and viscosity, while the combination of oxygen atoms on PEG chains and aluminum ions in solution reduced interfacial turbulence, leading to increased stability of the droplets.Hollow A1203 nanospheres with well-defined structure and shape were successfully prepared via flame spray pyrolysis （FSP） in the presence of a surfactant as droplet stabilizer. The morphology and structure of the nanospheres were systematically characterized by transmission electron microscopy, scanning electron microscopy, and N2 sorption. A solution of hydrated aluminum nitrate, polyethylene glycol （PEG） and absolute ethanol was sprayed into a flame to transform droplets into particles after evaporation and surface nucleation, forming hollow AI203 nanospheres from aluminum nitrate decomposition. The surfactant was found effective in producing smaller droplets because of decreased surface tension and viscosity, while the combination of oxygen atoms on PEG chains and aluminum ions in solution reduced interfacial turbulence, leading to increased stability of the droplets.

关 键 词：Flame spray pyrolysis Surfactant-assisted Al2O3 Hollow nanospheres 

分 类 号：TQ423[化学工程] TF123.72[冶金工程—粉末冶金]