Oleophobic glass articles

Patent metadata

Field	Value
Publication number	US-10898933-B2
Application number	US-201313905367-A
Country	US
Kind code	B2
Filing date	May 30, 2013
Priority date	May 31, 2012
Publication date	Jan 26, 2021
Grant date	Jan 26, 2021

Abstract

Described herein are glass substrates having oleophobic surfaces that are substantially free of features that form a reentrant geometry. The surfaces can include a plurality of gas-trapping features, extending from the surface to a depth below the surface, that are substantially isolated from each other. The gas-trapping features are capable of trapping gas below any droplets that are contacted with the surface so as to prevent wetting of the surface by the droplets.

First claim

The invention claimed is:

1. An oleophobic article, comprising:
a glass substrate comprising a flat surface; and
a patterned oleophobic coating, disposed on the flat surface of the glass substrate, comprising a plurality of non-interacting adjacent gas-trapping features separated by a distance b, wherein each gas-trapping feature comprises an opening in an outer surface of the patterned oleophobic coating that extends to a depth below the outer surface, each opening having a cross-sectional dimension a, wherein an average a is about 10 nanometers to about 100 micrometers so that when a liquid drop contacts the flat surface, the liquid drop forms a liquid meniscus having a concave shape that traps the gas within the gas-trapping features and compresses the gas that is trapped within the gas-trapping features and wherein the patterned oleophobic coating imparts oleophobicity to the glass substrate.

2. The oleophobic article of claim 1 , wherein each gas-trapping feature comprises an isolated cavity defined by at least one wall and a floor, and wherein each opening physically traps gas when a liquid is located on the outer surface.

3. The oleophobic article of claim 1 , wherein the outer surface has an open fraction in a range from about 0.40 to about 0.95.

4. The oleophobic article of claim 1 , wherein_the plurality of non-interacting adjacent gas-trapping features are not in fluid communication with each other.

5. The oleophobic article of claim 1 , wherein each opening extends into the patterned oleophobic coating to a depth H, and wherein an average H is about 10 nanometers up to about 100 micrometers.

6. The oleophobic article of claim 1 , wherein an average b is about 10 nanometers to about 50 micrometers.

7. The oleophobic article of claim 1 , wherein the glass substrate comprises an alkali aluminosilicate glass.

8. The oleophobic article of claim 1 , wherein the patterned oleophobic coating is formed from an oxide material.

9. The oleophobic article of claim 1 , wherein the oleophobic article is hydrophobic.

10. The oleophobic article of claim 1 , wherein the oleophobic article exhibits a total reflectance over a visible light spectrum that is lower than a total reflectance of the glass substrate without the patterned oleophobic coating disposed thereon.

11. An oleophobic article, comprising:
a chemically strengthened alkali aluminosilicate glass substrate comprising a flat surface; and
a patterned oleophobic coating of an oxide material, disposed on the flat surface of the chemically strengthened alkali aluminosilicate glass substrate, comprising a plurality of non-interacting gas-trapping features, wherein the patterned oleophobic coating imparts oleophobicity to the glass substrate;
wherein each gas-trapping feature comprises an opening in an outer surface of the patterned oleophobic coating that extends to a depth below the outer surface;
wherein the outer surface has an open fraction in a range from about 0.40 to about 0.95;
wherein each opening has a cross-sectional dimension a, and wherein an average a is about 10 nanometers to about 100 micrometers;
wherein each opening extends into the patterned oleophobic coating to a depth H, and wherein an average H is about 10 nanometers up to about 100 micrometers; and
wherein adjacent gas-trapping features in the patterned oleophobic coating are separated by a distance b, and wherein an average b is about 10 nanometers to about 50 micrometers so that when a liquid drop contacts the flat surface, the liquid drop forms a liquid meniscus having a concave shape that traps the gas within the gas-trapping features and compresses the gas that is trapped within the gas-trapping features.

12. The oleophobic article of claim 11 , wherein the oleophobic article is hydrophobic.

13. The oleophobic article of claim 11 , wherein the oleophobic article exhibits a total reflectance over a visible light spectrum that is lower than a total reflectance of the glass substrate without the patterned oleophobic coating disposed thereon.

14. The oleophobic article of claim 2 , wherein adjacent gas-trapping features in the patterned oleophobic coating are separated by a distance b, and there is a ratio of b/a such that when oil is placed in contact with the oleophobic article, there is a contact angle greater than or equal to 90°.

15. The oleophobic article of claim 11 , wherein there is a ratio of b/a such that when oil is placed in contact with the oleophobic article, there is a contact angle greater than or equal to 90°.

16. The oleophobic article of claim 1 , wherein the gas-trapping features comprise an array of adjacent holes, the holes comprising a shape selected from the group consisting of cylindrical holes, polygonal holes, trapezoidal holes, triangular holes, diamond holes, square holes and rectangular holes.

17. The oleophobic article of claim 16 , wherein the article comprises an array of square gas-trapping features mimicking the appearance of a waffle.

18. The oleophobic article of claim 11 , wherein the gas-trapping features comprise an array of adjacent holes, comprising a shape selected from the group consisting of cylindrical holes, polygonal holes, trapezoidal holes, triangular holes, diamond holes, square holes and rectangular holes.

19. The oleophobic article of claim 18 , wherein the article comprises an array of square gas-trapping features mimicking the appearance of a waffle.

Assignees

• Corning Inc

Inventors

• Baca Adra Smith
• Baker David Eugene
• Mazumder Prantik
• Quesada Mark Alejandro
• Senaratne Wageesha

Classifications

• C03C17/245

  by deposition from the vapour phase · CPC title

• C03C2218/33

  by etching · CPC title

• C03C2217/213

  SiO2 · CPC title

• C03C2217/76

  Hydrophobic and oleophobic coatings · CPC title

• C03C2218/34

  Masking · CPC title