Titanium dioxide nanoparticles were prepared by hydrolysis of titanium tetra-isopropoxide. Aqueous solutions with various pH and the resultant reaction morphology on the preparation of TiO2 nanoparticles were investigated. The influence of pH on the reaction morphology of using a titanium tetra-isopropoxide was evaluated depending on the amounts of the catalysts such as HCl and NH4OH. The morphology and phase transformation of TiO2 particles prepared by the hydrolysis of titanium tetra-isopropoxide were strongly influenced by the presence of the catalysts. In the case of using NH4OH, the morphology of the TiO2 particles exhibited a powder form. In the case of using HCl, it showed a bulk or granular form. The phase transformations of amorphous Ti(OH)(4) to anatase TiO2 and the anatase to rutile were significantly influenced by the type and the amount of the catalysts.

Keywords: TiO2 nanoparticle; hydrolysis; TTIP; pH; reaction morphology