Hot Wall Synthesis: Oxides and supported metals

The synthesis of nanoscale particles is possible in flame reactors but also in hot wall systems. Due to the freedom in the choice of the gas composition oxidation sensitive materials are also within reach. 

Principle: Precursor materials for the desired particle materials are transferred into the gas phase and decomposed and oxidized in the hot wall reactor. Highly fractal structures are formed with high specific surface areas. The variation of surface roughness, fractal structure and particle size is possible by the choice of process parameters. Spherical particles can be obtained by complete coalescence at high temperatures. 

Further possibilities for structuring open up when precursors of various materials are mixed. In this manner, depending on the chosen materials, homogeneously mixed oxides or core-shell structures can be synthesized.