Substrate with a photocatalytic coating

Substrate (1) according to one of the preceding claims, characterized in that the crystalline titanium oxide is in the form of crystallites with an average size of between 0.5 and 60 nm, preferably 1 to 50 nm, in particular 10 to 40 nm.

Substrate (1) according to one of the preceding claims, characterized in that the coating (3) also contains an inorganic material, in particular in the form of an amorphous or partially crystalline oxide or mixture of oxides of the silicon oxide, titanium oxide, tin oxide, zirconium oxide or aluminium oxide type.

Substrate (1) according to one of the preceding claims, characterized in that the coating comprises additives capable of accentuating the photocatalytic phenomenon due to the titanium oxide, in particular increasing the absorption band of the coating and/or by increasing the number of charge carriers by doping the crystal lattice of the oxide or by surface doping the coating and/or by increasing the yield and kinetics of the photocatalytic reactions by covering at least part of the coating with a catalyst.

Substrate (1) according to one of the preceding claims, characterized in that the surface of the coating (3) is hydrophilic, with in particular a contact angle with water of less than 5° after exposure to light radiation, and/or oleophilic.

Substrate (1) according to one of the preceding claims, characterized in that the RMS roughness of the coating (3) is between 2 and 20 nm, in particular between 5 and 20 nm.

Substrate (1) according to one of the preceding claims, characterized in that at least one thin layer (2) with an anti-static, thermal or optical function or forming a carrier to the migration of the alkali metals originating from the substrate (1) is arranged under the coating (3) with a photocatalytic property.

Substrate (1) according to claim 14, characterized in that the thin layer (2) with an anti-static, optionally with controlled polarization, and/or thermal and/or optical function is based on conductive material of the metal type or of the doped metal oxide type, such as ITO, SnO2:F, ZnO:In, ZnO:F, ZnO:Al, ZnO:Sn or metal oxide which is stoichiometrically deficient in oxygen, such as SnO2−n or ZnO2−n with x<2.

Monolithic, multiple unit of the double glazing type or laminated “dirt-repellent and/or anti-condensation” glazing incorporating the substrate (1) according to one of the preceding claims.