Acetate-derived ZnO ultrafine particles synthesized by spray pyrolysis
Acetate-derived ZnO ultrafine particles synthesized by spray pyrolysis
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DOI：
10.1016/s0032-5910(98)00047-3
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发表时间：
1998-11
影响因子：
5.2
通讯作者：
Xinyu Zhao;B. Zheng;Chunzhong Li;H. Gu
中科院分区：
文献类型：
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作者：
Xinyu Zhao;B. Zheng;Chunzhong Li;H. Gu
用差热分析(DTA)和热重分析(TGA)研究了二水醋酸锌的热分解过程。无水醋酸锌的分解机理为随机成核机理(Avrami方程II)，机理模型为(dα/dt)=1.8×10 7exp(−10 3×10 3/RT)3(1−α)-[−ln(1−α)]2/3。产物颗粒形貌和反应温度对颗粒性质的影响可以用随机成核机理和模型来解释。
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 °C. Anhydrous zinc acetate melts at 210–250 °C, and fully decomposes into ZnO at about 400 °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 (dα/dt) = 1.8 × 107exp(−103 × 103/RT)3 (1 − α)-[− ln(1 − α)]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.