Nano/micro-sized titania powders were prepared by a hydrothermal method using an aqueous solution of TiCl 4 as precursor. The influence of the concentration of the aqueous TiCl 4 solution on the formation, phase, morphology, and grain size of the products was investigated at various reaction temperatures and times. Increasing the concentration of TiCl 4 favored the formation of rutile type TiO 2 . When [TiCl 4 ]v0.5 mol dm 23 , the products were a mixture of rutile type and anatase type powders, the percentage of rutile type powders in all crystalline products varied with reaction time. When [TiCl 4 ]~0.5 mol dm 23 , the product was a pure rutile type powder. The powder size was related to the concentration based on the nucleation and growth theory of supersaturated solutions. A growth unit model was proposed to explain the phase formation.
scite is a Brooklyn-based organization that helps researchers better discover and understand research articles through Smart Citations–citations that display the context of the citation and describe whether the article provides supporting or contrasting evidence. scite is used by students and researchers from around the world and is funded in part by the National Science Foundation and the National Institute on Drug Abuse of the National Institutes of Health.