Controlled growth of titania nanospheres in supercritical carbon dioxide using a novel surfactant stabilised precursor

摘要

Titania nanospheres have been synthesised via the controlled hydrolysis of a mixture of novel precursor [Ti(OPr~i)_3(Krytox)]_n and titanium (IV) isopropoxide,[Ti(OPr~i)_4],in supercritical carbon dioxide (sc-CO_2).The use of sc-CO_2 in the reaction,eliminates the need for organic solvents,optimises manufacturing efficiency and produces materials with tailored properties;additionally the use of the functionalised precursor [Ti(OPr~i)_3-(Krytox)]_n,during co-hydrolysis with [Ti(OPr~i)_4],gave a significantly narrower particle size distribution for the products than when the functionalised compound was not present.