Influence of particle size of titanium dioxide on UV-ray shielding property

Abstract

The influence of particle size (0.019-0.24 µm) of TiO 2 on UV-ray shielding capability was studied. UV-ray shielding capability of TiO 2 depended on the wavelength. That is, the smaller the primary particle size was, the greater its shielding capability against around 300 nm of UV-B range was. On the contrary, for the shielding capability against around 350 nm of UV-A range, an optimum primary particle size was found. Furthermore, the optimum primary particle size varied, depending on dispersion strength of the particles in a paint.