Photocatalyst process for making surface hydrophillic

Details Photocatalyst process for making surface hydrophillic Photocatalyst process for making surface hydrophillic

C - Chemistry, Metallurgy

09

D

C09D 5/00 (2006.01) B01J 35/02 (2006.01) B32B 33/00 (2006.01) C03C 17/25 (2006.01) C03C 17/34 (2006.01) C09D 1/00 (2006.01) C09K 3/18 (2006.01)

Patent

CA 2241059

A method for hydrophilifying the surface of a substrate by taking advantage of photocatalytic action. The substrate has a photocatalytic titanic coating (10). The surface of the photocatalytic coating (10) bears the solid acid that increases a hydrogen bond component (.gamma.s h) in the surface energy in the solid/gas interface of the coating. Photoexcitation of the photocatalyst enhances the hydrogen bond component (.gamma.s h) in the surface energy of the photocatalytic coating (10), accelerating the physical adsorption of molecules of water in the atmosphere through a hydrogen bond (16) onto hydrogen atoms in a terminal OH group (12), bonded to a titanium atom, and a bridge OH group (14) on the surface of the coating. This results in the formation of a high density, physically adsorbed water layer (18) on the surface of the photocatalytic coating (10), thus permitting the surface of the substrate to be easily hydrophilified. The method is applicable to antifogging, antifouling, selfcleaning and cleaning of articles.

L'invention concerne un procédé pour rendre la surface d'un substrat hydrophile par photocatalyse. Un substrat est couvert avec un revêtement d'oxyde de titane photocatalytique (10) portant sur sa surface un acide solide augmentant la composante liaisons hydrogène ( gamma s<h>) de l'énergie de surface à la limite solide-liquide. L'excitation photonique du photocatalyseur augmente la composante liaisons hydrogène ( gamma s<h>) par photocatalyse, ce qui accélère l'adsorption physique de molécules d'eau atmosphériques sur les atomes d'hydrogène des groupes OH terminaux (12) liés aux atomes de titane présents sur la surface et la formation de ponts entre les groupes OH (14), par des liaisons hydrogène (16). Le résultat de l'adsorption est une couche d'eau adsorbée physiquement (18) présentant une densité élevée, formée sur la surface du revêtement photocatalytique (10), ce qui produit une surface hydrophile. Ce procédé est efficace pour la protection d'articles contre le dépôt de buée ou de salissures, ainsi que pour réaliser des articles autonettoyants.

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