TiO2 nanoparticles and methods of producing the same are provided. The nanoparticles can be processed by neutralization, calcination, and/or micronization. The TiO2 nanoparticle size is controlled by controlling synthetic and process conditions. TiO2 nanoparticles produced are of the anatase polymorph, of the rutile polymorph, or a mixture thereof, and have particle sizes in the range of from 10 nm to 100 nm.