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When
the surface of photocatalytic film is exposed to light, the contact
angle of the phtocatalyst surface with water is reduced gradually.
After enough exposure to light, the surface reaches super-hydrophilicity.
In other words, it does not repel water at all, so water cannot exist
in the shape of a drop, but spreads flatly on the surface of the
substrate. And the water took the form of a highly uniform thin
film, which behaves optically like a clear sheet of glass.
The
hydrophilic nature of titanium dioxide, coupled with the gravity,
will enable the dust particles to be swept away following the water
stream, thus making the product self-cleaning.
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