Study On TiO₂and Titanium Acid With Different Micro-morphology

TiO₂nanomaterial has good performance for excellent surface super-hydrophobic,ultraviolet shielding property and light catalytic characteristics, so it has a fineapplication prospect in building materials, cosmetics, stealth aircraft, solar cells, andso on. Now the technology of preparing TiO₂nanomaterials and the formationmechanism remains to be improved by further study. This paper makes a study ofhow to prepare various morphology of TiO₂nanomaterials, and how the preparationconditions influence the process of growth, the change of morphology, the type ofcrystal.Results and conclusions are as follows:（1） The self-organized, highly ordered nanotubular with80μm length and smoothtubewall are fabricated on Ti by anodization method using ethylene glycol solventwith2vol％water. The influence law of various factors in anodization method isobtained. A. Using ethylene glycol solvent with few water, the growth rate and thelength of TiO₂nanotubes greatly speed up, while the diameter of nanotubs becomessmaller, the wall turns into more smooth, and the degree of order gets better. B. Thenanotube length will increase with the increase of anodization potential and time, thethickness of nanotube wall will decrease with the increase of anodization potentialand time, while the diameter of nanotubes remains the same without obvious change.C. The change rule of the nanotube length is according with the exponential functiontype.（2） TiO₂nanobelt/nanotube composite structure was obtained using anodicoxidation. The forming mechanism of TiO₂nanobelt using anodization method isanalysed. It is considered that the nanobelt is he material that teared and collapsednanotube. The maximum length of nanotubes is determined by the balance of theupper tube "splitting" speed and the tube bottom oxide generation speed.（3） The anatase TiO₂/titanium acid composite material was obtained inalkalescent hydrothermal enviroment using TiO₂nanotubes as reactant. Therelationship of the composite material structure and primary crystal structure, reactionparameters in the formation and growth process of anatase TiO₂/titanium acidnanometer material is discussed. The result proved that it is a process of the transformation from amorphous TiO₂nanotubes to metastable titanium acidnanosheets and relative stable anatase TiO₂.