Patent ID: 7884047
Filing Date: 2011-02-08
Classification: C03C,Y10T

Abstract:
1. A structure comprising a substrate bearing, on at least part of its surface, a photocatalytic antisoiling layer comprising titanium dioxide (TiO 2 ), wherein said photocatalytic antisoiling layer is coated with a thin nonporous layer comprising silicon and oxygen and having a covering power, wherein said thin nonporous layer mechanically and chemically protects the underlying photocatalytic layer, while maintaining the photocatalytic activity of the titanium dioxide (TiO 2 ), and wherein immediately below the photocatalytic antisoiling layer is an underlayer having a crystallographic structure for assisting in the crystallization, by heteroepitaxial growth, in the anatase form of the photocatalytic antisoiling layer, wherein the underlayer is made of BaTiO 3 and/or SrTiO 3 .