With a solution of titanium tetrachloride of 2 mol/L as the precursor solution,the triblock copolymer F127 as a structure directing agent,a ball was emulsified through evaporation-induced self-assembly method of suspension aid.A porous titanium dioxide ball was obtained by baking in a muffle furnace at 500 ℃.And then the deionized water as solvent was added into triblock copolymer F127 and lithium acetate dehydrate.A certain percentage of the precursor of titanium dioxide was mixed after dissolved.By ultras...