摘要
Previous studies have been shown that synthesis of titania （TiO2） crystalline phase purity could be effectively controlled by the oxygen concentration through titanium tetra-isopropoxide （TTIP） via premixed flame from a Bunsen burner. In this study, a modified Hencken burner was used to synthesize smaller TiO2 nanoparticles via short diffusion flames. The frequency of collisions among particles would decrease and reduce TiO2 nanoparticle size in a short diffusion flame height. The crystalline structure of the synthesized nanoparticles was characterized by X-ray diffraction （XRD）, transmission electron microscope （TEM）, Barrett-Joyner- Halenda （BJH） and Brnnauer-Emmett-Teller （BET） measurements. The characteristic properties of TiO2 nanoparticles synthesized from a modified Hencken burner were compared with the results from a Bunsen burner and commercial TiO2 （Degussa P25）. The results showed that the average particle size of 6.63 nm from BET method was produced by a modified Hencken burner which was smaller than the TiO2 in a Bunsen burner and commercial TiO2. Moreover, the ruffle content of TiO2 nanoparticles increased as the particle collecting height increased. Also, the size of TiO2 nanoparticles was highly dependent on the TTIP loading and the collecting height in the flame.
基金
supported by the National Science Council under grant NSC 98-2621-M-002-037-MY2
