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Nanosized amorphous TiO_2 powders with a specific surface area of 501 m~2·g~(-1)were prepared by hydrolysis. Aftercalcined at 400℃ for 2 h, the prepared amorphous TiO_2 powders were fully transformed into anatase crystalliteswith a specific surface area of 141 m~2·g~(-1). Differential scanning calorimetric (DSC) experiments were performed onthe samples of nanosized amorphous TiO_2 mixed with microsized anatase, nanosized anatase, or nanosized a-Al_2O_3respectively. Effects of sample packing, anatase addition, or α-Al_2O_3 addition on the crystallization behavior ofnanosized amorphous TiO_2 were analyzed.
Nanosized amorphous TiO 2 powders with a specific surface area of 501 m ~ 2 · g -1 were prepared by hydrolysis. Aftercalcined at 400 ℃ for 2 h, the prepared amorphous TiO_2 powders were completely transformed into anatase crystallites with a specific surface area of 141 m ~ 2 · g ~ (-1). Differential scanning calorimetric (DSC) experiments were performed on the samples of nanosized amorphous TiO_2 mixed with microsized anatase, nanosized anatase, or nanosized a-Al_2O_3respectively. α-Al 2 O 3 addition on the crystallization behavior ofnanosized amorphous TiO_2 were analyzed.