Minimizing aggregation effects in flame synthesized nanoparticles

A number of techniques have evolved over the past several years for the synthesis of ceramic powders. However, only few methods have addressed the issue of aggregation of nanoparticles. We have optimized a vapor phase synthesis process, called Combustion Flame-Chemical Vapor Condensation CCF-CVC), which involves pyrolysis of chemical precursors in a low-pressure flat flame. By controlling processing parameters, we have produced nanopowders of oxides that have an average aggregate size of about 100 nm and an average primary particle size of less than 25 nm. (Author)