多级自持连续反应法制备单分散ITO纳米粉体

We are trying to develop a new liquid phase synthesis - multi-level self-sustaining continuous synthesis. Using this method,ITO nanopowders can be prepared continously. First of all, a multi-stage combustion agent system, metal oxide precursor and various additives composition should be examined by the TG/DTA. Furthermore, the synthesis procedure in the moving reactor, namely the droplet should be investigated and the related thermodynamic behaviors are going to be clarified. The moving rate, temperature and weightloss of the droplet should be sketched by developing new techniques. Using statistical analysis method to investigate the multi-stage driven process and heat and mass transfer process. The external factors, such as airflow and temperature field, their influence to the reaction process and the resulting powder morphology are going to be revealed. Finally, through the observation and analysis of the new phenomenon and the new law appeared in this new methods, the fundamental thermodynamics model is needed.

本申请致力于发展一种全新的液相制备方法- - 多级自持连续反应法，以实现ITO纳米粉体的连续化制备。围绕这一基本目标，首先借助失重差热分析（TG/DTA）设计出适用于静态反应的多级燃烧剂体系及与之相匹配的金属氧化物前驱体和各类助剂组合物。在此基础上，对连续化制备中的动态反应过程进行研究，发展能够对迅速移动的液滴进行移动速率、温度和重量测量的技术手段，建立有关统计分析方法，系统研究动态反应的多级驱动过程、传质传热过程。同时揭示气流、温场等外部因素对反应过程和产物粉体形貌、性能的调控机制。最后通过对新方法中出现的新现象、新规律的观察和分析，建立基本的热动力学模型以给出系统的原理性的解释。

本课题致力于发展一种全新的液相制备方法——多级自持连续反应法， 以实现ITO纳米粉体的连续化制备。围绕这一基本目标，首先借助失重差热分析（TG/DTA）设计出适用于静态反应的多级燃烧剂体系及与之相匹配的金属氧化物前驱体和各类助剂组合物。在此基础上，结合喷雾干燥技术以实现连续化制备。因此课题同时对喷雾形成的单液滴燃烧的动态传质传热过程进行了研究，掌握了单液滴反应器中多级反应试剂间的匹配度和耦合作用规律。最后利用优选条件扩大实验规模，制备了大量ITO纳米粉体，并进行了试制靶，证实了该方法制备的粉体综合性能由于普通商用ITO纳米粉体。