Doped Titanium Dioxide Coatings and Methods of Forming Doped Titanium Dioxide Coatings

• US 20100062032A1
• Filed: 09/09/2008
• Published: 03/11/2010
• Est. Priority Date: 09/09/2008
• Status: Abandoned Application

• Current Assignee: Guardian Glass LLC (KOCH Industries Incorporated)
• Original Assignee: Guardian Industries Corporation (KOCH Industries Incorporated)
• Inventors: SHARMA, PRAMOD K.
• Application Number:
  US12/207,167
• Publication Number:
  US 20100062032A1
• Time in Patent Office: Days
• US Class Current: 424/409
• CPC Class Codes: A01N 2300/00 Combinations or mixtures of active ingredients covered by classes A01N27/00 - A01N65/48 with other active or formulation relevant ingredients, e.g. specific carrier materials or surfactants, covered by classes A01N25/00 - A01N65/48
• CPC Class Codes: A01N 25/04 Dispersions, emulsions, suspoemulsions, suspension concentrates or gels foams A01N25/16
• CPC Class Codes: A01N 25/34 Shaped forms, e.g. sheets, not provided for in any other sub-group of this main group
• CPC Class Codes: A01N 59/16 Heavy metals; Compounds thereof
• CPC Class Codes: B01J 21/063 Titanium; Oxides or hydroxides thereof
• CPC Class Codes: B01J 23/50 Silver
• CPC Class Codes: B01J 35/0013 Colloids
• CPC Class Codes: B01J 35/004 Photocatalysts
• CPC Class Codes: B01J 35/23 in a colloidal state
• CPC Class Codes: B01J 35/39 Photocatalytic properties
• CPC Class Codes: B01J 37/0215 Coating
• CPC Class Codes: C01P 2002/54 one element only
• CPC Class Codes: C01P 2002/84 by UV- or VIS- data
• CPC Class Codes: C03C 17/256 Coating containing TiO2
• CPC Class Codes: C03C 2204/02 Antibacterial glass, glaze or enamel
• CPC Class Codes: C03C 2217/212 TiO2
• CPC Class Codes: C03C 2217/24 Doped oxides
• CPC Class Codes: C03C 2217/71 Photocatalytic coatings
• CPC Class Codes: C03C 2218/113 by sol-gel processes
• CPC Class Codes: C09C 1/3653 Treatment with inorganic compounds
• CPC Class Codes: C09C 1/3661 : Coating

Abstract

Methods for forming doped titanium dioxide coatings are disclosed. Sol-gel compositions are prepared having at least one dopant, are formed on a substrate, and heated at a temperature sufficient to form a doped anatase titanium dioxide coating. Doped titanium dioxide coatings having at least one of improved antimicrobial properties, self-cleaning properties, hydrophilicity, and/or activation time are also disclosed. Substrates comprising such coatings are also disclosed.

Claims

1. A method of forming a doped anatase titanium dioxide coating on a substrate, comprising:

preparing a titanium dioxide sol-gel composition comprising at least one dopant;

coating the substrate with the sol-gel composition; and

heating the coated substrate to form a doped anatase titanium dioxide coating.

2. The method of claim 1, wherein said at least one dopant is chosen from silver, silver oxide, tungsten, tungsten oxide, gold, and tin oxide.

3. The method of claim 2, wherein said at least one dopant is chosen from silver and silver oxide.

4. The method of claim 3, wherein said at least one dopant comprises colloidal silver.

5. The method of claim 3, wherein the at least one dopant is a silver nitrate solution.

6. The method of claim 1, wherein said substrate comprises a glass substrate.

7. The method of claim 6, wherein said glass substrate is chosen from clear and low-iron glass substrates.

8. The method of claim 1, wherein the coated substrate is heated at a temperature greater than about 600°

C.

9. A method of improving at least one of antimicrobial properties, self-cleaning properties, hydrophilicity, and activation time of a titanium dioxide coating, comprising:

preparing a titanium dioxide sol-gel composition comprising at least one dopant;

coating a substrate with the sol-gel composition; and

heating the coated substrate to form a doped anatase titanium dioxide coating.

10. The method of claim 9, wherein said at least one dopant is chosen from silver, silver oxide, tungsten, tungsten oxide, gold, and tin oxide.

11. The method of claim 10, wherein said at least one dopant is chosen from silver and silver oxide.

12. The method of claim 11, wherein said at least one dopant comprises colloidal silver.

13. The method of claim 11, wherein the at least one dopant is a silver nitrate solution.

14. The method of claim 9, wherein said substrate is chosen from clear and low-iron glass.

15. The method of claim 9, wherein the coated substrate is heated at a temperature greater than about 600°

C.

16. An antimicrobial coating, comprising:

a substrate;

a doped anatase titanium dioxide coating on a surface of said substrate.

17. The antimicrobial coating of claim 16, wherein the doped anatase titanium dioxide coating comprises up to about 5 wt % of a dopant.

18. The antimicrobial coating of claim 16, wherein the doped anatase titanium dioxide coating comprises at least one dopant chosen from silver, silver oxide, tungsten, tungsten oxide, gold, and tin oxide.

19. The antimicrobial coating of claim 18, wherein the at least one dopant is chosen from silver and silver oxide.

20. The antimicrobial coating of claim 19, wherein the at least one dopant comprises silver oxide.

21. The antimicrobial coating of claim 16, wherein said substrate comprises a glass substrate.

22. The antimicrobial coating of claim 21, wherein said glass substrate is chosen from clear and low-iron glass substrates.

23. A doped titanium dioxide coating having at least one of improved antimicrobial properties, improved self-cleaning properties, and improved hydrophilicity, wherein said doped titanium dioxide coating is made by:

preparing a titanium dioxide sol-gel composition comprising at least one dopant;

coating a substrate with the sol-gel composition; and

heating the coated substrate to form a doped anatase titanium dioxide coating.