抄録
In this study, we report spherical shaped oxide materials obtained by flash synthesis. The diameter of spherical particles is in the range 100nm to 100 μm and their surface structure is nano-fiber network, aggregation of nano-cubes and smooth types. This method is simple combustion synthesis in which a mixture of starting materials is combusted by external heating and ignited one end, combustion wave propagates from the end to the other. The starting mixtures are evaporated and form droplet (spherical shape), and then quenched on the surface of collection trap. Because of the quenching, global structure (spherical shape) is kept and the shape of droplet acts as template. We have succeeded the synthesis of spherical shaped SrTiO3, TiO2, CaTiO3 and Fe2O3 particles. Especially, in the case of synthesis with Ti powder in starting mixture, we also succeeded the synthesis of spherical hollow shaped particles.
