文献类型：会议论文

英文题名：Acetate-derived ZnO ultrafine particles synthesized by spray pyrolysis

作者：Zhao, XY; Zheng, BC; Li, CZ; Gu, HC

机构：[1]E China Univ Sci & Technol, Inst Tech Chem & Phys, Shanghai 200237, Peoples R China

会议论文集：1996 China/Japan Symposium on Particuology

会议日期：MAY 24-25, 1996

会议地点：TSINGHUA UNIV, BEIJING, PEOPLES R CHINA

主办单位：TSINGHUA UNIV

语种：英文

外文关键词：thermal decomposition; random nucleation; particle morphology; zinc oxide; spray pyrolysis; powder synthesis

摘要：The thermal decomposition process of zinc acetate dihydrate was studied by differential thermal analysis (DTA) and thermal gravimetric analysis (TGA). It Is shown that the water of crystallization is removed at below 200 degrees C. Anhydrous zinc acetate melts at 210-250 degrees C, and fully decomposes into ZnO at about 400 degrees C. The Mechanism of decomposition of anhydrous zinc acetate is inferred as a random nucleation mechanism (Avrami equation II), and a mechanism model is established as (d alpha/dt) = 1.8 X 10(7) exp( -103 X 10(3)/RT)3(1 - alpha)-[-1n(1 - alpha)](2/3). Pure ZnO ultrafine powders with uniform size of 20-30 nm were synthesized by spray pyrolysis from. solution of zinc acetate dihydrate. The product particle morphology and the effect of reaction temperature on the particle properties can be explained by the random nucleation mechanism and model. (C) 1998 Elsevier Science S.A. All rights reserved.