Stock material or miscellaneous articles – Surface property or characteristic of web – sheet or block
Patent
1998-06-19
2000-07-18
Meeks, Timothy
Stock material or miscellaneous articles
Surface property or characteristic of web, sheet or block
4284111, 427301, 427333, B32B 900, B05D 304
Patent
active
060904895
ABSTRACT:
A method for hydrophilifying the surface of a substrate by taking advantage of photocatalytic action. The substrate has a photocatalytic titania coating (10). The surface of the photocatalytic coating (10) bears the solid acid that increases a hydrogen bond component (.gamma..sub.S.sup.h) in the surface energy in the solid/gas interface of the coating. Photoexcitation of the photocatalyst enhances the hydrogen bond component (.gamma..sub.S.sup.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.
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Chikuni Makoto
Fujishima Akira
Hashimoto Kazuhito
Hayakawa Makoto
Kitamura Atsushi
Meeks Timothy
Strain Paul D.
Toto Ltd.
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