Hydrothermal Synthesis Of Nano-microsphere Titania Self-assembly

In this paper, nano-microspheres were synthesized self-assembly via hydrothermal method. XRD and SEM were employed to characterize the crystal structure and morphology of the microspheres.Using TiCl3 as precursor, NaCl as mineralizer, TiO₂ nano-microspheres were synthesized self-assembly at 170℃for 24h by hydrothermal method with the presence of different surfactants, including CTAB, SDS, and PVP. The spheres were all rutile with diameters of about 1³0μm. The spheres were composed of radially aligned nanorods with diameters of about 50²00nm and lengths of 1¹5μm. The type of surfactant, he concentration of surfactant, the concentration of mineralizer had a great influence on the morphologies of TiO₂ microspheres. The experiments showed that uniformly dispersed, completely grown TiO₂ microspheres were obtained at the reaction time of 24h, reaction temperature of 170℃,with 6mol/L NaCl as mineralizer, 0.015mol/L CTAB as surfactant.Using TiCl3 as precursor, NaCl as mineralizer, TiO₂ nano-microspheres were synthesized self-assembly self-assembly at 170℃for 24h by hydrothermal method with the presence of coordination agent, including CN2H4O, FeCl2?4H2O and NiCl2?6H2O. The rutile TiO₂ microspheres were composed of radially aligned nanorods. The TiO₂ microspheres prepared by adding CN2H4O were 3μm⁵μm in diameter, the nanorods were 300nm⁸00nm in length and 30nm⁵0nm in diameter. The microspheres prepared by addingFeCl2·4H2O were 3μm⁵μm in diameter, the nanorods were 500nm in length and 50nm in diameter.Using TiCl3 as precursor, NaCl as mineralizer, TiO₂ nano-microspheres were synthesized self-assembly self-assembly at 170℃for 2h by microwave-hydrothermal method with the presence CTAB as the surfactant. Though There were little difference on the morphology and structure between the microspheres prepared by microwave-hydrothermal method and normal hydrothermal method. However, microwave-hydrothermal method increased the reaction rate about one magnitude.