Photocatalytically-activated self-cleaning article and method of making same
First Claim
1. A photocatalytically-activated self-cleaning article of manufacture comprising:
- a substrate having at least one surface; and
a photocatalytically-activated self-cleaning coating deposited over the surface of the substrate by a process selected from the group consisting of chemical vapor deposition, magnetron sputtered vacuum deposition and spray pyrolysis.
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Abstract
A method and article are disclosed wherein a substrate is provided with a photocatalytically-activated self-cleaning surface by forming a photocatalytically-activated self-cleaning coating on the substrate by spray pyrolysis chemical vapor deposition or magnetron sputter vacuum deposition. The coating has a thickness of at least about 500 Angstroms to limit sodium-ion poisoning to a portion of the coating facing the substrate. Alternatively, a sodium ion diffusion barrier layer is deposited over the substrate prior to the deposition of the photocatalytically-activated self-cleaning coating to prevent sodium ion poisoning of the photocatalytically-activated self-cleaning coating. The substrate includes glass substrates, including glass sheet and continuous float glass ribbon.
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Citations
40 Claims
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1. A photocatalytically-activated self-cleaning article of manufacture comprising:
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a substrate having at least one surface; and
a photocatalytically-activated self-cleaning coating deposited over the surface of the substrate by a process selected from the group consisting of chemical vapor deposition, magnetron sputtered vacuum deposition and spray pyrolysis. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26)
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27. A method for providing a titanium dioxide photocatalytically-activated self-cleaning coating over a continuous glass float ribbon during the manufacture of the float ribbon comprising the steps of:
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manufacturing a continuous glass float ribbon having a first major surface and an opposite major surface defined as a second major surface, the first major surface having a thin layer of a tin oxide diffused therein characteristic of forming the glass float ribbon on a molten tin bath;
positioning a chemical vapor deposition coating apparatus over the surface of the float ribbon at a point in the manufacture of the float ribbon where the float ribbon has a temperature of at least about 400°
C. (752°
F.);
directing a metal oxide precursor selected from the group consisting of titanium tetrachloride, titanium tetraisopropoxide and titanium tetraethoxide in a carrier gas stream through said chemical vapor deposition apparatus over the surface of the float ribbon and annealing the float ribbon to produce a titanium dioxide photocatalytically-activated self-cleaning coating over the glass float ribbon.
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28. A method for providing a titanium dioxide photocatalytically-activated self-cleaning coating over a continuous glass float ribbon during the manufacture of the float ribbon comprising the steps of:
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manufacturing a continuous glass float ribbon having a first major surface and an opposite major surface defined as a second major surface, the first major surface having a thin layer of metal selected from the group consisting of tin, tin oxides and mixtures thereof diffused therein characteristic of forming the glass float ribbon on a molten tin bath;
depositing a photocatalytically-activated self-cleaning coating over at least one of the major surfaces by positioning a spray pyrolysis coating apparatus over the surface of the float ribbon at a point in the manufacture of the float ribbon where the float ribbon has a temperature of at least about 400°
C. (752°
F.), directing an aqueous suspension of titanyl acetylacetonate and wetting agent in an aqueous medium through said spray pyrolysis coating apparatus over the surface of the float ribbon and annealing the float ribbon in air to produce a titanium dioxide photocatalytically-activated self-cleaning coating over the glass float ribbon.
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29. In a method for forming a glass float ribbon wherein the method includes the steps of melting glass batch materials in a furnace;
- delivering the molten glass onto a bath of molten tin;
pulling the molten glass across the tin bath whereupon the glass is sized and controllably cooled to form a dimensionally stable glass float ribbon;
removing the float ribbon from the tin bath;
moving the float ribbon by conveying roller through a lehr to anneal the float ribbon;
moving the float ribbon to a cutting station on conveying rollers where the ribbon is cut into glass sheets, the improvement comprising;
depositing a photocatalytically-activated self-cleaning coating over a surface of said float ribbon as the float ribbon is formed. - View Dependent Claims (30, 31)
- delivering the molten glass onto a bath of molten tin;
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32. A method for the manufacture of a photocatalytically-activated self-cleaning article of manufacture comprising the steps of:
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providing an article of manufacture having at least one surface;
depositing a photocatalytically-activated self-cleaning coating over the surface of the article of manufacture by a process selected from the group consisting of chemical vapor deposition, magnetron sputtered vacuum deposition and spray pyrolysis. - View Dependent Claims (33, 34, 35, 36, 37, 38, 39, 40)
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Specification