Large-scale synthesis of hollow titania spheres via flame combustion

作     者：Jie Liu Yanjie Hu Feng Gu Chunzhong Li 

作者机构：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 版 物：《Particuology》 (颗粒学报（英文版）)

年 卷 期：2011年第9卷第6期

页      面：632-636页

核心收录：

学科分类：081702[工学-化学工艺] 07[理学] 070205[理学-凝聚态物理] 08[工学] 0817[工学-化学工程与技术] 080501[工学-材料物理与化学] 0805[工学-材料科学与工程（可授工学、理学学位）] 0702[理学-物理学] 

基　　金：supported by the National Natural Science Foundation of China (20925621, 20706015, 20906027) the Program of Shanghai Subject Chief Scientist (08XD1401500) the Shanghai Shuguang Scholars Tracking Program (08GG09) the Special Projects for Key Laboratories in Shanghai (09DZ2202000) the Special Projects for Nanotechnology of Shanghai (0852nm02000,0952nm02100) 

主　　题：Flame combustion Hollow spheres Titania Formation mechanism Large scale 

摘      要：A one-step method for continuous large-scale synthesis of well-defined hollow titania spheres was established by feeding titanium tetrachloride mixed with ethanol vapor to a facile diffusion flame. A mixture of TiCl4 and C2H5OH vapor was transported at 100 m/s into a flame reactor and condensed into mesoscale droplets due to Joule-Thomson cooling and the entrainment of cool gases into the expanding high-speed jet. Hollow crystalline TiO2 spheres with good thermal stability were formed after the hydrolysis of TiCl4 in the H2/air flame at about 1500℃. Structural characterization indicates that the hollow spheres, with uniform diameter of 300 nm and shell thickness of 35 rim, consist of 20-30 nm TiO2 nanocrystallites. A formation mechanism of the hollow spheres was proposed, involving the competition between chemical reaction and diffusion during the flame process. The present study provides a new pathway for continuous and large-scale engineering of hollow nanomaterials.