Suppression of the photoactivity of Titanium Dioxide (Rutile) pigment by thermal and mechanical processing and by the adsorption of iron ions.
01 January 1987
The photoactivity of n-TiO(2) (rutile) pigment is reduced by thermal quenching, by ball-milling and by adsorption of iron ions. The reduced photoreactivity is caused by thermally, mechanically and chemically introduced electron-hole recombination sites. The results imply that the photostability of a paint made with an uncoated semiconducting pigment can depend on temperatures and cooling rates in steps of the pigment's manufacture, on the duration and conditions of milling of the pigment and the paint and on chemical contaminants on the surface of the pigment particles.