The formation of mesoporous spherical titania particles via hydrolysis of pure titanium tetra-isopropoxide in n-heptane solution upon the application of a slow stirring rate is described. Calcination of the dry hydrolysis product produced pure anatase at 400–600oC, and Ž 2 rutile at 8008C. Nitrogen adsorption results indicate high surface area S 132 m rg and uniform mesopores peaking at 10 nm for the . BET material calcined at 400oC. Upon calcination at 600oC, the pore size remained at 10 nm, whereas the S value was decreased. The BET material calcined at 4008C was found by scanning electron microcopy to be shaped into spherical particles about 2 mm in diameter. Sizes of the spherical particles were unchanged at 4008C and up to 800oC. This was ascribed to the spherical morphology of the particles which prevented primary particles from growing beyond the boundary of the host aggregate even when the rutile phase transition occurred at 800C.