Nanocrystal Assembled TiO2 Particles Prepared from Aqueous Solution

Anatase TiO 2 particles, 100−200 nm in diameter, were developed in aqueous solution at 50 °C. The particles were assemblies of nano TiO 2 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 ∼3 nm and ∼1 nm in diameter. Crystallization and self-assembly of nano TiO 2 were effectively utilized to fabricate nanocrystal assembled TiO 2 particles having a high surface area and nanorelief surface structure.