Volume 9 Issue 6
您当前的位置:首页 > 期刊文章 > 过刊浏览 > Volume 9 (2011) > Volume 9 Issue 6
Liu, J., Hu, Y., Gu, F., & Li, C. (2011). Large-scale synthesis of hollow titania spheres via flame combustion. Particuology, 9(6), 632–636. https://doi.org/10.1016/j.partic.2010.12.004
Large-scale synthesis of hollow titania spheres via flame combustion
Jie Liu, Yanjie Hu, Feng Gu, Chunzhong Li *
Key Laboratory for Ultrafine Materials of Ministry of Education, School of Materials Science and Engineering, East China University of Science & Technology, Shanghai 200237, China
10.1016/j.partic.2010.12.004
Volume 9, Issue 6, December 2011, Pages 632-636
Received 13 October 2010, Revised 5 December 2010, Accepted 13 December 2010, Available online 1 September 2011.
E-mail: czli@ecust.edu.cn; huyanjie@ecust.edu.cn

Highlights
Abstract

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 °C. Structural characterization indicates that the hollow spheres, with uniform diameter of 300 nm and shell thickness of 35 nm, 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.

Graphical abstract
Keywords
Flame combustion; Hollow spheres; Titania; Formation mechanism; Large-scale