Kinetik und Strukturbildung von komplexen Nanopartikeln in Modellströmungsreaktoren

模型流动反应器中复杂纳米粒子的动力学和结构形成

• 批准号: 276061439
• 负责人: Professor Dr.-Ing. Frank Einar Kruis
• 金额: --
• 依托单位: Fachgebiet Nanostrukturtechnik
• 依托单位国家: 德国
• 项目类别: Research Units
• 资助国家: 德国
• 项目状态: 未结题
• 来源: https://gepris.dfg.de/gepris/projekt/276061439?language=en
• 关键词: Kinetik; und; Strukturbildung; von; komplexen

Nanoparticles can show a complex structure, such score-shell or structured aggregates, which allows to realize novel material properties and joint properties. The fundamental processes during particle formation and agglomeration can oft difficult be interpreted, as the nanoparticles in the aerosol to be investigated are rather different in their size, form and agglomerate structure and their interaction as well as the coating and sintering processes strongly depend on these properties. At the same time, it is a great challenge to monitor the resulting changes and processes in an unambiguous way. This project aims at an investigation of these fundamental properties in a better defined manner, by providing aerosols in form of well-defined core-particles, spherical or aggregated, by means of size-fractionation and in-flight sintering. Then a thermal restructuring is initiated in a flow reactor, this can be sintering process increasing the primary particle size or a coating process. Applying online measurement techniques such as SMPS, CPMA, DAPS und ELPI the resulting changes are analyzed as function of the reaction conditions and materials system, and the processes are analyzed with help of models. This technique is modified and adopted to low-pressure reactors, to clarify the particle structure as function of the reaction conditions. Conventional particle dynamical models are not able to described the formed structures, as they describe only the particle volume and not structure or composition. For that reason, Monte-Carlo simulation techniques are being applied, which allow to described multivariate properties of particles and aggregates of particles. Goal of this project is to clarify, to quantify and to model the processes taking place during the structuring of complex particle systems in the gas phase. Materials will be investigated which have relevance for TP3 and TP4: Fe and Si particles and their oxidation products.

纳米颗粒可以表现出复杂的结构，例如刻痕壳或结构化聚集体，这允许实现新的材料特性和接合特性。颗粒形成和团聚过程中的基本过程往往难以解释，因为待研究的气溶胶中的纳米颗粒在其尺寸、形式和团聚体结构方面相当不同，它们的相互作用以及涂覆和烧结过程强烈依赖于这些性质。与此同时，以明确的方式监测由此产生的变化和进程也是一个巨大的挑战。该项目的目的是以更明确的方式调查这些基本性质，通过尺寸分级和飞行中烧结提供明确界定的球形或聚集的核心颗粒形式的气溶胶。 然后在流动反应器中开始热重组，这可以是增加初级颗粒尺寸的烧结过程或涂层过程。应用在线测量技术，如SMPS，CPMA，DAPS和ELPI，分析所产生的变化作为反应条件和材料系统的函数，并借助模型分析过程。该技术被修改并采用到低压反应器中，以澄清作为反应条件的函数的颗粒结构。传统的颗粒动力学模型不能描述所形成的结构，因为它们只描述颗粒的体积，而不是结构或组成。为此，应用蒙特-卡罗模拟技术，其允许描述颗粒和颗粒聚集体的多变量性质。 该项目的目标是澄清，量化和模拟过程中发生的复杂粒子系统的结构在气相中。将研究与TP 3和TP 4相关的材料：Fe和Si颗粒及其氧化产物。