Modelling and simulation of continuous hydrothermal flow synthesis process for nano-materials manufacture
Modelling and simulation of continuous hydrothermal flow synthesis process for nano-materials manufacture
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DOI：
10.1016/j.supflu.2011.07.002
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发表时间：
2011-11-01
影响因子：
3.9
通讯作者：
Wang, Xue Z.
中科院分区：
文献类型：
--
作者：
Chen, Man;Ma, Cai Y.;Wang, Xue Z.
连续水热流合成技术在纳米材料的制备方面显示出了其他合成方法无法比拟的优势。CHFS使用超临界水流作为反应剂，其与金属盐流反应以在反应器中产生纳米颗粒。该方法不使用有机溶剂，因此是绿色的，并且由于处于连续操作模式，因此具有良好的可控性。实验研究表明，非常高质量的纳米铈可以在几分钟内而不是几天内制成。本文介绍了采用粒子数平衡模拟技术对CHFS过程中的反应和沉淀过程进行模拟研究。提出了反应动力学、热力学和成核模型。粒子数平衡模型还考虑了粒子表面生长机制和粒子聚集效应。模拟了超临界条件下的系统动力学和粒度分布的动态演化。研究了温度、团聚体和生长速率对粒径分布的影响。(C)2011 Elsevier B.V.保留所有权利。
Continuous hydrothermal flow synthesis (CHFS) technology has shown great advantages in nanomaterial formulation compared with other synthesis methods. CHFS uses a flow of supercritical water as a reagent that reacts with a flow of metal salts to produce nanoparticles in a reactor. The process uses no organic solvent, therefore is green, and has good controllability due to being in continuous operational mode. Experimental studies have shown that very high quality nanoceramics can be made in minutes rather than days. This paper describes simulation studies of the reaction and precipitation in a CHFS process using population balance modelling technique. Models for reaction kinetics, thermodynamics and nucleation are presented. Particle surface growth mechanism and particle aggregation effects have also been taken into consideration in the population balance models. System kinetics and the dynamic evolution of particle size distribution under supercritical conditions were simulated. The effects of temperature, aggregation and growth rate on particle size distribution were also investigated. (C) 2011 Elsevier B.V. All rights reserved.