Titania and silica powders produced in a counterflow diffusion flame

摘要: Earlier publications describe the counterflow diffusion flame burner and its unique capability to produce oxide particles having certain structures, such as spheres of one material coated with another, composition attached bulbs another composition, uniform multicomponent mixtures. Here we production properties bulk quantities powders produced using this burner. Measurements were made specific surface area and, for titania, phase composition. It was found that controls over powder characteristics used in other forms flame-synthesis are equally effective We both silica titania decrease increasing precursor concentrations. Transmission electron microscopy analysis indicates mean size comprise these increases concentration. These trends consistent collision-coalescence theory particle growth. In addition, crystalline can be controlled by selecting appropriate feed stream. For example, ranges TiCl{sub 4} concentrations tested, feeding it only into {ital oxidizer} stream yields mainly anatase} TiO{sub 2} powders, while fuel} {italmore » rutile} powders. explained known atmosphere-dependent anatase-rutile transformation. The present data demonstrate that, addition shapes morphologies, manipulated either major commercial phases, also silica, a wide range areas. {copyright} 1996 Materials Research Society.}« less