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Titanium dioxide (TiO2) nanoparticles of rutile phase were synthesized by hydrolysis of TiCl4 at 95 ℃ in aqueous solution. The samples as prepared and calcined at 500 ℃ were characterized by XRD, TG-DTA and TEM. The sample as prepared was of imperfect rutile structure, and its morphology was rod-like with a diameter of 10~20 nm, a length of 20~80 nm and an aspect ratio of 2~4. The structure of the sample calcined at 500 ℃ was a perfect rutile one, and its morphology was rod-like with a diameter of 15~25 nm, a length of 25~105 nm and an aspect ratio of 2~4. These results indicate that calcination temperature has a positive effect on the structure and the size of rutile nanocrystals, and has no effect on the aspect ratio of rutile nanocrystal. A model for the formation mechnism of rutile nanocrystal in aqueous solution under hydrolysis conditions has been proposed.
Titanium dioxide (TiO2) nanoparticles of rutile phase were synthesized by hydrolysis of TiCl4 at 95 ℃ in aqueous solution. The samples were prepared and calcined at 500 ℃ were characterized by XRD, TG-DTA and TEM. The sample as prepared was imperfect rutile structure and the morphology was rod-like with a diameter of 10-20 nm, a length of 20-80 nm and an aspect ratio of 2-4. The structure of the sample calcined at 500 ° C. was a perfect rutile one, and its morphology was rod-like with a diameter of 15-25 nm, a length of 25-105 nm and an aspect ratio of 2-4. These results indicate that calcination temperature has a positive effect on the structure and the size of rutile nanocrystals , and has no effect on the aspect ratio of rutile nanocrystal. A model for the formation mechnism of rutile nanocrystal in aqueous solution under hydrolysis conditions has been proposed.