Patterned coatings having extreme wetting properties and methods of making

• US 8,153,233 B2
• Filed: 09/11/2006
• Issued: 04/10/2012
• Est. Priority Date: 11/08/2005
• Status: Active Grant

• Current Assignee: Massachusetts Institute of Technology
• Original Assignee: Massachusetts Institute of Technology
• Inventors: Sheng, Xiaoxia, Zhai, Lei, Rubner, Michael F., Cohen, Robert E.
• Primary Examiner(s): Sample, David
• Assistant Examiner(s): ROSENBERG, NANCY D
• Application Number:
  US11/530,751
• Publication Number:
  US 20070166513A1
• Time in Patent Office: 2,038 Days
• Field of Search: 428/141
• US Class Current: 428/141
• CPC Class Codes: B05D 1/18 performed by dipping
• CPC Class Codes: B05D 5/04 to obtain a surface receptive to ink or other liquid B05D5/02, B41M5/52 take precedence
• CPC Class Codes: B05D 5/06 to obtain multicolour or other optical effects B05D5/02 takes precedence
• CPC Class Codes: C03C 17/3405 with at least two coatings of organic materials C03C17/36, C03C17/42 take precedence
• CPC Class Codes: C03C 2217/42 consisting of particles only
• CPC Class Codes: C03C 2217/425 consisting of a porous layer
• CPC Class Codes: C03C 2217/478 Silica
• CPC Class Codes: C03C 2217/75 Hydrophilic and oleophilic coatings
• CPC Class Codes: C08L 33/02 Homopolymers or copolymers of acids; Metal or ammonium salts thereof
• CPC Class Codes: C09D 139/00 Coating compositions based on homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by a single or double bond to nitrogen or by a heterocyclic ring containing nitrogen; Coating compositions based on derivatives of such polymers
• CPC Class Codes: Y10T 428/24355 Continuous and nonuniform or irregular surface on layer or component [e.g., roofing, etc.]
• CPC Class Codes: Y10T 428/24372 Particulate matter
• CPC Class Codes: Y10T 428/24942 including components having same physical characteristic in differing degree
• CPC Class Codes: Y10T 428/25 Web or sheet containing structurally defined element or component and including a second component containing structurally defined particles

Abstract

A surface with superhydrophobic and hydrophilic or superhydrophilic regions can be made. The hydrophilic or superhydrophilic regions can selective collect water on the surface.

Claims

1. A patterned surface comprising:

a substrate supporting a superhydrophobic coating, the superhydrophobic coating including a high-roughness polyelectrolyte multilayer, a nanometer-scale feature associated with the high-roughness polyelectrolyte multilayer, and a hydrophobic material; and

a region of reduced hydrophobicity superimposed on a predetermined region of the superhydrophobic coating, wherein the region of reduced hydrophobicity is a superhydrophilic region.

2. The surface of claim 1, wherein the high-roughness polyelectrolyte multilayer includes a first organic polyelectrolyte.

3. The surface of claim 2, wherein the high-roughness polyelectrolyte multilayer includes a second organic polyelectrolyte.

4. The surface of claim 3, wherein the nanometer-scale feature includes a nanoparticle.

5. The surface of claim 4, wherein the hydrophobic material includes a fluoropolymer.

6. The surface of claim 5, wherein the region of reduced hydrophobicity further includes a third organic polyelectrolyte.

7. The surface of claim 1, further comprising an antibacterial agent.

8. The surface of claim 7, wherein the antibacterial agent includes a silver nanoparticle or a quaternary amine.

9. The surface of claim 1, wherein the high-roughness polyelectrolyte layer has an rms roughness of 100 nm or greater.

10. The surface of claim 1, wherein the nanometer-scale feature is between 1 to 1000 nanometers.