titanium

When sunlight comes in and strikes a photocatalyst,like TiO2, or titanium dioxide,it creates these really reactive oxygen species,

and they coat the inside with this photocatalytic coating.But photocatalysts like titanium dioxideare actually commonly used in sunscreens

VV: That was the real trick --is actually building a titanium spherethat was accurate to within .1 percent of machine.

that was accurate to within .1 percent of machine.Titanium is a hard metal to workand a lot of people haven't figured it out,

is now my photocatalytic composite for water purification.The composite combines titanium dioxide with cement.The cement-like composite can be formed into several different shapes,