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首页> 外文会议>European Meeting on Supercritical Fluids >SYNTHESIS OF INORGANIC NANOPARTICLES IN SUPERCRITICAL FLUIDS A SIMPLE MODEL TO PREDICT PARTICLE SIZE
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SYNTHESIS OF INORGANIC NANOPARTICLES IN SUPERCRITICAL FLUIDS A SIMPLE MODEL TO PREDICT PARTICLE SIZE

机译：超临界流体中无机纳米颗粒的合成简单模型来预测粒径

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One of the most promising developments of supercritical fluid technologies concerns today the field of inorganic, hybrid and organic materials processing. Two well known ways are generally associated to materials processing in supercritical fluids: the first way with processes based on a physical transformation (RESS, SAS, PGSS … processes) and the second one with processes based on a chemical transformation (thermolysis, red-ox, solvolysis … reactions). The process of materials synthesis in supercritical fluids, developed at ICMCB, is based on a chemical reaction which induces the nucleation and growth of inorganic nanoparticles. A wide range of nanostructured materials can also be produced (metals, semiconductors, oxides and nitrides); the knowledge of the influence of operating parameters allows to tune finely the characteristics of final particles (size, morphology, composition and structure). However, the development of materials processing in supercritical fluids is closely linked to the proposition of numerical tools. Regarding fine particles synthesis, we have developed a simple model of particle growth in supercritical fluids. This proceeding describes an attractive simulation tool based on a simple model to predict the evolution of particle size and particle size distribution depending on the operating parameters. The modeling of the growth of nanoparticles is based on a population balance equation taking into account the phenomena that occur in the reactor: the collision and the coalescence of particles. The developed numerical program has been validated in the case of the nucleation and growth of metal nanoparticles in a supercritical CO_2/ethanol mixture.
机译：今天超临界流体技术的最有希望的发展之一是无机，杂种和有机材料加工领域。众所周知的方式通常与超临界流体中的材料加工相关联：基于物理变换（RESS，SAS，PGSS ......工艺）的方法和基于化学转化的过程（Thermolys，Red-Ox ，溶剂分解...反应）。在ICMCB开发的超临界流体中材料合成的方法基于化学反应，诱导无机纳米颗粒的成核和生长。还可以生产各种纳米结构材料（金属，半导体，氧化物和氮化物）;操作参数的影响的知识允许精细调谐最终颗粒的特征（大小，形态，组成和结构）。然而，超临界流体中材料加工的发展与数值工具的命题密切相关。关于细颗粒合成，我们已经开发出一种超临界流体中的颗粒生长模型。该程序描述了一种基于简单模型的吸引力的仿真工具，以预测根据操作参数的粒度和粒度分布的演变。纳米颗粒生长的建模基于群体平衡方程，考虑到反应器中发生的现象：颗粒的碰撞和聚结。在超临界CO_2 /乙醇混合物中的金属纳米颗粒的成核和生长的情况下已经验证了开发的数值。

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