Synthesis and Formation Mechanism of Ultrafine Zno Particles by Spray Pyrolysis

Abstract

Pure ZnO particles with a uniform size of 20-30 nm were synthesized by spray pyrolysis under the optimum operation conditions: reactor temperature above 650°C, solution concentration of 0.40-0.50 M, solution flow rate of 4.0-5.0 ml/min, and air pressure of 0.45-0.55 MPa. The ultrafine ZnO powder has excellent ultraviolet (UV) cutoff characteristics, therefore, it is an ideal raw material for cosmetics to shield UV light. The mechanism of ultrafine particle formation during spray pyrolysis is proposed. Micrometer precursor particles consisting of nanometer primary particles are formed after solvent evaporation, then the primary particles are separated by an "explosion" caused by an acute pyrolysis reaction to form ultrafine aggregate-free particles. © 1997 Plenum Publishing Corporation.

Department(s)

Materials Science and Engineering

Keywords and Phrases

Spray pyrolysis; Ultrafine particle; ZnO

International Standard Serial Number (ISSN)

1064-7562

Document Type

Article - Journal

Document Version

Citation

File Type

text

Language(s)

English

Rights

© 2024 The Authors, All rights reserved.

Publication Date

01 Dec 1997

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