Liquid-repellent coatings

Patent metadata

Field	Value
Publication number	US-11912890-B2
Application number	US-202217701546-A
Country	US
Kind code	B2
Filing date	Mar 22, 2022
Priority date	Aug 19, 2015
Publication date	Feb 27, 2024
Grant date	Feb 27, 2024

Abstract

The invention relates generally to liquid-repellent coatings, and in particular, to porous liquid-repellent coatings, a method of preparing the porous liquid-repellent coatings, and a method of characterizing a porous surface for the liquid-repellent coatings. The invention further relates to a porous liquid-repellent coating comprising a porous layer of a transition metal oxide and/or hydroxide and a layer of a liquid-repellent compound deposited onto the porous layer of the transition metal oxide and/or hydroxide, wherein the porous layer of the transition metal oxide and/or hydroxide is comprised of a plurality of surface pores of varying angles with an average angle that is re-entrant.

First claim

The invention claimed is:

1. A liquid-repellent surface comprising: a metallic substrate and a porous liquid repellent coating applied thereon; wherein the porous liquid repellent coating comprises a porous layer of a transition metal oxide, wherein the transition metal oxide comprises one or more of manganese oxide, nickel oxide, nickel hydroxide, iron oxide, or copper oxide, or copper hydroxide; and a layer of a liquid-repellent compound deposited onto the porous layer of the transition metal oxide, wherein the porous layer of the transition metal oxide comprises a plurality of surface pores of varying angles with an average angle that is reentrant, and wherein the metallic substrate contributes metal ions to form a mixed transition metal oxide with the porous layer.

2. The liquid-repellent surface of claim 1 , wherein the metallic substrate is aluminium substrate.

3. The liquid-repellent surface of claim 1 , wherein at least one of the plurality of surface pores has a reentrant angle of less than 90° and wherein at least one of the plurality of surface pores has an angle of more than 90°.

4. The liquid-repellent surface of claim 1 , wherein the coating comprises an average within-pore surface roughness factor of about 3.5.

5. The liquid-repellent surface of claim 1 , wherein the plurality of surface pores has an average diameter from about 50 nm to about 10 microns.

6. The liquid-repellent surface of claim 1 , wherein the transition metal oxide comprises manganese oxide.

7. The liquid-repellent surface of claim 6 , wherein the manganese oxide comprises manganese in a +2, +3, or +4 oxidation state, or a combination thereof.

Assignees

• Univ California

Inventors

• Brockway Lance
• Taylor Hayden Kingsley

Classifications

• C09D5/002 Primary

  Priming paints (C09D5/08 takes precedence) · CPC title

• C09D1/00

  Coating compositions, e.g. paints, varnishes or lacquers, based on inorganic substances · CPC title

• C09D5/1618

  inorganic · CPC title

• C09D5/1681

  Antifouling coatings characterised by surface structure, e.g. for roughness effect giving superhydrophobic coatings or Lotus effect · CPC title

• C09D7/65

  macromolecular (C09D7/41-C09D7/48 take precedence) · CPC title