Kontrolle der Oxidationsstufe von Eisen in Nanopartikeln aus Eisenoxiden und Eisen-Kohlenstoff-Kompositen in der chemischen Gasphasensynthese

在化学气相合成中控制由氧化铁和铁碳复合材料制成的纳米颗粒中铁的氧化态

• 批准号: 276059710
• 负责人: Professor Dr. Markus Winterer
• 金额: --
• 依托单位: Lehrstuhl für Nanopartikel-Prozesstechnik
• 依托单位国家: 德国
• 项目类别: Research Units
• 财政年份: 2015
• 资助国家: 德国
• 起止时间: 2014-12-31 至 2022-12-31
• 项目状态: 已结题
• 来源: https://gepris.dfg.de/gepris/projekt/276059710?language=en
• 关键词: Kontrolle; der; Oxidationsstufe; von; Eisen

Formation of nanoparticles in the gas phase, here in chemical vapor synthesis (CVS), is a dynamic process the details of which can only be elucidated in detail by in situ methods, especially since the very small nanoparticles may transform after synthesis and crucial information may be lost in ex situ studies. In this project for the first time X-ray scattering methods – small and wide angle scattering – will be applied to investigate particle formation and transformation in CVS. This enables also the observation of intermediate, transient and metastable – including partially oxidized – particle phases. The application of these methods to particles in the gas phase is experimentally highly challenging because of the low particle density in the gas phase and, therefore, low scattering density. However, advanced synchrotron radiation sources, X-ray detectors and our novel, mobile CVS-reactor enable these experiments.

纳米粒子在气相中的形成是一个动态过程，其细节只能通过原位方法来详细阐明，特别是因为非常小的纳米粒子在合成后可能会发生变化，关键信息可能会在非原位研究中丢失。在本项目中，将首次应用X射线散射方法--小角度和广角散射--来研究CVS中颗粒的形成和转变。这也使得能够观察到中间的、瞬时的和亚稳态的--包括部分氧化的--颗粒相。将这些方法应用于气相中的颗粒在实验上具有很高的挑战性，因为气相中的颗粒密度很低，因此散射密度也很低。然而，先进的同步辐射光源、X射线探测器和我们新颖的移动式CVS反应堆使这些实验成为可能。