Nanocrystal assembled TiO2 particles prepared from aqueous solution

Anatase TiO2 particles, 100-200 nm in diameter, were developed in aqueous solution at 50 degrees C. The particles were assemblies of nano TiO2 crystals covered with nanorelief surface structures. The crystals grew anisotropically along the c-axis to form acicular crystals. The particles showed c-axis orientation due to high-intensity X-ray diffraction from the (004) planes. The particles had a BET specific surface area of 270 m(2)/g. BJH and DFT/Monte-Carlo analysis of adsorption isotherm indicated the existence of pores similar to 3 nm and similar to 1 nm in diameter. Crystallization and self-assembly of nano TiO2 were effectively utilized to fabricate nanocrystal assembled TiO2 particles having a high surface area and nanorelief surface structure.