WEB Characterization of fractal structures produced by flame spray pyrolysis
Flame Spray Pyrolysis (FSP) is a cost-effective process that allows the synthesis of nanoparticles with large specific surface and crystalline structures. A liquid precursor consisting of metal salts and solvents is injected into a methane oxygen flame and atomized by additional oxygen. A ring of pressured air stabilizes the turbulent flame to avoid backmixing. This synthesis can produce different metal oxides and the operating conditions influence the structure of the particles.
Because of the multiscale information obtained about the primary particles, agglomerates and the fractal structure, small-angle X-ray scattering (SAXS) is well suited to investigate this particle system. The particle characterization is completed by measurements using transmission electron microscopy (TEM), dynamic light scattering (DLS) and sedimentation analysis in the centrifugal field.
Additionally, a setup for insitu SAXS at the Synchrotron KARA in Karlsruhe allows to measure directly though and above the flame thus gaining insights in the particle nucleation and growth processes.
This contribution shows a detailed characterization of FSP products in addition to insitu SAXS measurements to investigate the formation process of the particles during the synthesis.