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.

在化学气相合成（CVS）中，纳米颗粒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颗粒在合成后可能会发生转变，而在非原位研究中可能会丢失关键信息。在本项目中，将首次应用x射线散射方法-小角和广角散射-来研究CVS中的粒子形成和转变。这也使观察中间、瞬态和亚稳-包括部分氧化-颗粒相成为可能。由于气相颗粒密度低，因此散射密度低，因此这些方法在气相颗粒中的应用在实验上具有很高的挑战性。然而，先进的同步加速器辐射源，x射线探测器和我们新颖的移动cvs反应堆使这些实验成为可能。