Preparation of hollow alumina nanospheres via surfactant-assisted flame spray pyrolysis--颗粒学报PARTICUOLOGY

Hu, Y., Ding, H., & Li, C. (2011). Preparation of hollow alumina nanospheres via surfactant-assisted flame spray pyrolysis. Particuology, 9(5), 528–532. https://doi.org/10.1016/j.partic.2011.06.003

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

Yanjie Hu, Hongqiu Ding, 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.2011.06.003

Volume 9, Issue 5, October 2011, Pages 528-532

Received 21 October 2010, Revised 16 June 2011, Accepted 20 June 2011, Available online 19 September 2011.

E-mail: czli@ecust.edu.cn

Highlights

Abstract

Hollow Al₂O₃ 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 Al₂O₃ 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.

Graphical abstract

Keywords

Flame spray pyrolysis; Surfactant-assisted; Al₂O₃; Hollow nanospheres

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