hydrophilic property of titanium dioxide, coupled with the
gravity, will enable the dust
particles to be rinse away following the water stream, thus making
the product self-cleaning.
the surface of photocatalytic film is irridiated by light, the contact
angle of the phtocatalyst surface with water is then reduced therefor;the coating does not repel water at all so water cannot
exist in the shape of a drop. As the end result the water took the form of an
uniform thin film, which slide off from the surface.
Most of buildings exterior walls become soiled due to automotive exhaust
fumes, which contain oily components. When the original building
materials are coated with photocatalyst, the dirt on the walls
will wash away with rainfall, keeping building exteriors clean at