Synthesis of functional hetero aggregates in the gas phase

这一提议的主要方面是两种颗粒类的组合生成及其随后在气相中的异质聚集、其特定物理化学性质和形态的分析以及调整颗粒-颗粒相互作用力。在10 nm至1 μm的预期尺寸范围内的颗粒-颗粒相互作用由货车范德华力主导，并且可以由静电相互作用以及弱化学键支持，即，氢键此外，在羟基封端的表面的情况下，缩合反应可以发挥重要作用，这通常在氧化物颗粒中观察到。因此，除了不同材料的“纯”气相混合导致异质聚集体之外，颗粒表面组成的研究、理解和设计对于异质聚集体的目标形成也是决定性的。为此，研究了两种组分A和B在气相中的混合物以及B在气相中在A上的生长。不同物质的生产在两种不同类型的反应器中进行：喷雾火焰反应器和微波等离子体反应器。感兴趣的焦点主要是TiO 2、石墨烯、铂和硅等材料以及由它们形成的异质聚集体，这些材料可用于催化、能量转换和能量存储领域。

The combined generation of two particle classes and their subsequent hetero aggregation in the gas phase, the analysis of their specific physico-chemical properties and morphology as well as tuning the particle–particle interaction forces are the main aspects of this proposal. Particle-particle interactions in the intended size regime of 10 nm to 1 μm are dominated by van der Waals forces and can be supported by electrostatic interaction as well as weak chemical bonds, i.e., hydrogen bonds. In addition, condensation reactions can play an important role in case of hydroxyl-terminated surfaces, typically observed for oxidic particles. Thus, besides the “pure” gas-phase mixing of different materials leading to hetero aggregates, the investigation, understanding and design of the particle surface composition is also decisive for the targeted formation of hetero aggregates. For this purpose, the mixture of two components A and B in the gas phase as well as the growth of B on A in the gas phase is investigated. The production of the different substances takes place in two different types of reactors: Spray flame reactor and microwave plasma reactor. The focus of interest is mainly on materials such as TiO2, graphene, platinum and silicon and heteroaggregates formed from them, which can be used in the fields of catalysis, energy conversion and energy storage.