Porous titanium dioxide coatings and methods of forming porous titanium dioxide coatings having improved photocatalytic activity
AssigneeGuardian Industries Corp.
InventorPramod K. Sharma
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Abstract
Methods for forming porous anatase titanium dioxide coatings are disclosed. Sol-gel compositions are prepared having at least one porosity agent, are applied to a substrate, and at least one porosity agent is removed. Porous anatase titanium dioxide coatings having at least one of improved antimicrobial properties, self-cleaning properties, hydrophilicity, and/or temperability are also disclosed. Substrates comprising such coatings are also disclosed.
Claims15
A method of forming a porous anatase titanium dioxide coating on a substrate, comprising:
- preparing a titanium dioxide sol-gel composition comprising at least one porosity agent;
- coating the substrate with the sol-gel composition;
- and
- removing the porosity agent;
- wherein the porosity agent is removed by heating the coated substrate at a temperature greater than about 600° C. to form the anatase titanium dioxide coating from the sol-gel composition;
- wherein the porosity agent is present in the sol-gel composition in an amount comprising at least 5 wt % of the total weight of the sol-gel composition.
A method of improving at least one of antimicrobial properties, self-cleaning properties, hydrophilicity, and temperability of a titanium dioxide coating, comprising:
- preparing a titanium dioxide sol-gel composition comprising at least one porosity agent;
- coating a substrate with the sol-gel composition;
- and
- heating the coated substrate to remove the porosity agent without forming rutile phase titanium dioxide;
- wherein the porosity agent is removed by heating the coated substrate at a temperature greater than about 600° C. to form an anatase titanium dioxide coating from the sol-gel composition;
- wherein the porosity agent is present in the sol-gel composition in an amount comprising at least 5 wt % of the total weight of the sol-gel composition.
Dependencies are inferred from the claim text.