文献类型：期刊文献

英文题名：Synthesis and formation mechanism of ultrafine ZnO particles by spray pyrolysis

作者：Zhao, Xinyu[1]; Zhang, Shi Chang[1]; Li, Chunzhong[1]; Zheng, Baicun[1]; Gu, Hongchen[1]

机构：[1]Univ Missouri, Dept Ceram Engn, Rolla, MO 65401 USA;[2]E China Univ Sci & Technol, Inst Tech Chem Phys, Shanghai 200237, Peoples R China

年份：1997

卷号：5

期号：3

起止页码：227

外文期刊名：JOURNAL OF MATERIALS SYNTHESIS AND PROCESSING

收录：;EI(收录号：1997483855561);WOS:【SCI-EXPANDED(收录号:WOS:000072020400005)】；

语种：英文

外文关键词：ZnO; ultrafine particle; spray pyrolysis

摘要：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 degrees 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.