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本文使用火焰合成方法在平焰燃烧器上合成了平均粒径为(23.1士1.9)nm的氧化锆纳米颗粒材料。针对火焰合成中从前驱物到纳米颗粒的演化过程,本文提出了基于时间尺度分析的简化研究方法;对合成过程中多尺度的物理化学过程进行解耦,并计算了不同温度下前驱物的分解反应与颗粒碰撞聚并过程的特征时间。从计算中可以发现,氧化锆的前驱物分解反应在10~(-5)~10~(-5)s内最先发生,从而确定了颗粒生长过程的起点位置。随着粒径的增长,颗粒碰撞聚并过程则需要10~(-4)~10~(-1)s的时间进行,该步骤控制着前驱物颗粒演化过程的整体速率,并决定了最终产物的基本形貌特征(球形/团聚),与实验观测相符。
In this paper, a zirconia nanoparticle material with an average particle size of (23.1 ± 1.9) nm was synthesized by flame synthesis on a flat-flame burner. Aiming at the evolution of precursors to nanoparticles in flame synthesis, a simplified method based on time-scale analysis is proposed in this paper. The multi-scale physical and chemical processes in the synthesis process are decoupled and the decomposition of precursors at different temperatures is calculated Characteristic Time of Reaction and Particle Collision Aggregation Process. It can be found from the calculation that the precursor decomposition reaction of zirconia takes place first within 10-5 (10-5) s, so the starting position of particle growth is determined. As the particle size increases, it takes 10 ~ (-4) ~ 10 ~ (-1) s for particle collision and aggregation process, which controls the overall rate of precursor particle evolution and determines the final product The basic morphological features (spherical / reunion), consistent with the experimental observations.