A method of making the surface hydrophilic by photocatalyst, and a method of forming a composite material having a photocatalytic hydrophilic surface

摘要

The present invention relates to a method for hydrophilizing the surface of a substrate by a photocatalytic action. The substrate is coated with a photocatalytic titania coating (10). The surface of the photocatalytic coating 10 carries a solid acid which increases the hydrogen bonding component (? _S^h ) of the surface energy at its solid / gas interface. If the optical excitation of the photocatalyst, the hydrogen bonding of the surface energy of the photocatalytic coating (10) by the action of the photocatalyst component (γ _S^h) is increased, whereby a terminal OH group 12 is bonded to the titanium atom on the surface of and the bridge OH group The water molecules in the atmosphere are physically adsorbed by the hydrogen bonds 16 to the hydrogen atoms of the hydrogen atoms 14. As a result, a high-density physically adsorbed water layer 18 is formed on the surface of the photocatalytic coating 10, and the surface is easily hydrophilized. This method is applied to anti-fogging, antifouling, self-cleaning and cleaning of articles.