Antimicrobial articles with silver-containing alkali silicate coating and methods of making thereof
An antimicrobial article having a substrate, and a coating on a surface of the substrate. The coating includes a silver-containing alkali silicate. The antimicrobial article has an antimicrobial efficacy of greater than or equal to about 90.0% according to EPA Test Method for Efficacy of Copper Alloy Surfaces as a Sanitizer. The coating may further include at least one of a boron-containing compound and an aluminum-containing compound. A method for forming antimicrobial articles includes coating a substrate with a mixture comprising an alkali silicate; curing the coating at a temperature from greater than or equal to about 300° C. to less than or equal to about 620° C. for a duration of greater than or equal to about 15 minutes to less than or equal to about 120 minutes; and contacting the coating with an antimicrobial medium comprising silver nitrate and an alkali nitrate.
1. An antimicrobial article comprising:
a substrate; and
a coating on a surface of the substrate, the coating comprising a silver-containing alkali silicate,
wherein the antimicrobial article has an antimicrobial efficacy of greater than or equal to about 90.0% according to EPA Test Method for Efficacy of Copper Alloy Surfaces as a Sanitizer.
2. The antimicrobial article according to claim 1 , wherein the substrate is an amorphous substrate.
3. The antimicrobial article according to claim 2 , wherein the substrate is a glass selected from the group consisting of soda lime glass, alkali aluminosilicate glass, alkali-containing borosilicate glass, and alkali aluminoborosilicate glass.
4. The antimicrobial article according to claim 3 , wherein the substrate is chemically strengthened.
5. The antimicrobial article according to claim 1 , wherein the substrate is a crystalline substrate.
6. The antimicrobial article according to claim 1 , wherein the coating has a silica:alkali oxide molar ratio of greater than or equal to about 1.0 and less than or equal to about 50.
7. The antimicrobial article according to claim 1 , wherein the silver-containing alkali silicate is selected from the group consisting of silver-containing sodium silicate, silver-containing potassium silicate, and silver-containing lithium silicate.
8. The antimicrobial article according to claim 1 , wherein the antimicrobial article has a transparency greater than or equal to about 80% at wavelengths from 400 nm to 800 nm.
9. A device comprising the antimicrobial article according to claim 1 .
10. An antimicrobial article comprising:
a substrate; and
a coating on a surface of the substrate, the coating comprising at least one of a silver-containing alkali aluminosilicate and a silver-containing alkali borosilicate,
wherein the antimicrobial article has an antimicrobial efficacy of greater than or equal to about 90.0% according to EPA Test Method for Efficacy of Copper Alloy Surfaces as a Sanitizer.
11. The antimicrobial article according to claim 10 , wherein the coating has a silica:alkali oxide molar ratio of greater than or equal to 1.0 and less than or equal to 40.
12. The antimicrobial article according to claim 10 , wherein the coating comprises the silver-containing alkali aluminosilicate and has an aluminum oxide:alkali oxide molar ratio greater than or equal to about 1.0.
13. The antimicrobial article according to claim 10 , wherein the coating comprises the silver-containing alkali borosilicate and has a boron oxide:alkali oxide molar ratio greater than or equal to about 0.3.
14. The antimicrobial article according to claim 10 , wherein the silver-containing alkali aluminosilicate or the silver-containing alkali borosilicate is selected from the group consisting of silver-containing sodium borosilicate, silver-containing potassium borosilicate, silver-containing lithium borosilicate, silver-containing sodium aluminosilicate, silver-containing potassium aluminosilicate, and silver-containing lithium aluminosilicate.
15. The antimicrobial article according to claim 10 , wherein the antimicrobial article has a transparency greater than or equal to about 80% at wavelengths from 400 nm to 800 nm.
16. A device comprising the antimicrobial article according to claim 10 .