Photocatalyst/alloy fine-particle dispersion having anitbacterial/antifungal properties, method of preparation thereof, and member having photocatalyst/alloy thin film on surface
AssigneeShin-Etsu Chemical Co., Ltd.
InventorsManabu Furudate, Tomohiro Inoue
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Abstract
A photocatalyst/alloy fine-particle dispersion containing two kinds of fine particles dispersed in an aqueous dispersion medium, (i) photocatalyst fine particles and (ii) alloy fine particles containing an antibacterial/antifungal metal, easily forms a photocatalyst/alloy fine-particle thin film of high transparency that exhibits antibacterial/antifungal properties regardless of the presence or absence of light irradiation.
Claims10
A photocatalyst/alloy fine-particle dispersion comprising the following two kinds of fine particles dispersed in an aqueous dispersion medium:
- (i) photocatalyst fine particles, and
- (ii) alloy fine particles containing an antibacterial/antifungal metal.
A method for preparing a photocatalyst/alloy fine-particle dispersion, comprising the steps of:
- (1) preparing a peroxotitanic acid solution from a starting titanium compound, a basic substance, hydrogen peroxide and an aqueous dispersion medium;
- (2) preparing a titanium oxide fine-particle dispersion by heating the peroxotitanic acid solution prepared in Step (1) at between 80 and 250° C. under pressure control;
- (3) preparing a solution containing a starting antibacterial/antifungal metal compound and a solution containing a reducing agent for reducing the starting metal compound;
- (4) preparing an alloy fine-particle dispersion by mixing together the solution containing a starting antibacterial/antifungal metal compound and the solution containing a reducing agent for reducing the starting metal compound that were prepared in Step (3);
- (5) washing the alloy fine-particle dispersion prepared in Step (4) with an aqueous dispersion medium by membrane filtration method;
- and
- (6) mixing together the titanium oxide fine-particle dispersion and the alloy fine-particle dispersion obtained in Steps (2) and (5).
Dependencies are inferred from the claim text.