Slippery surfaces with high pressure stability, optical transparency, and self-healing characteristics

Patent metadata

Field	Value
Publication number	US-9932482-B2
Application number	US-201615134070-A
Country	US
Kind code	B2
Filing date	Apr 20, 2016
Priority date	Jan 19, 2011
Publication date	Apr 3, 2018
Grant date	Apr 3, 2018

Abstract

The present disclosure describes a strategy to create self-healing, slippery liquid-infused porous surfaces (SLIPS). Roughened (e.g., porous) surfaces can be utilized to lock in place a lubricating fluid, referred to herein as Liquid B to repel a wide range of materials, referred to herein as Object A (Solid A or Liquid A). SLIPS outperforms other conventional surfaces in its capability to repel various simple and complex liquids (water, hydrocarbons, crude oil and blood), maintain low-contact-angle hysteresis (<2.5°), quickly restore liquid-repellency after physical damage (within 0.1-1 s), resist ice, microorganisms and insects adhesion, and function at high pressure (up to at least 690 atm). Some exemplary application where SLIPS will be useful include energy-efficient fluid handling and transportation, optical sensing, medicine, and as self-cleaning, and anti-fouling materials operating in extreme environments.

First claim

What is claimed is:

1. An article having a repellant surface, the article comprising:
a substrate having a roughness factor, R that is greater than 1, wherein the roughness factor is defined as the ratio between the real surface area and the projected surface area; and
a lubricating liquid having an affinity for the substrate, the lubricating liquid wetting spontaneously and adhering to the roughened surface to form a stabilized liquid overlayer, wherein the lubricating liquid covers the roughened surface at a thickness sufficient to form the stabilized liquid overlayer above the roughened surface,
wherein the roughened surface and the lubricating liquid have an affinity for each other such that, at atmospheric pressure, the lubricating liquid is substantially stably immobilized in, on and over the roughened surface, without dewetting from the substrate to form a repellent surface.

2. The article of claim 1 , wherein the roughness factor, R, is greater than 1.5.

3. The article of claim 1 , wherein the substrate is chemically functionalized with functional groups that has a chemical affinity with the lubricating liquid.

4. The article of claim 3 , wherein the one or more functional groups comprise one or more fluorocarbon groups, one or more hydrocarbon groups, or mixtures thereof.

5. The article of claim 1 , wherein the substrate comprises a porous material having a plurality of pores.

6. The article of claim 1 , wherein the substrate comprises raised features having feature sizes ranging from about 10 nm to about 100 μm.

7. The article of claim 1 , wherein the lubricating liquid comprises a perfluorinated liquid, a fluorinated liquid, a silicon liquid, a food-grade oil, or a liquid hydrocarbon.

8. The article of claim 1 , wherein the lubricating liquid is a fluorinated lubricant.

9. The article of claim 1 , wherein the substrate is an optical component.

10. The article of claim 1 , wherein the substrate is a container.

11. The article of claim 1 , wherein the substrate is a medical device, a needle, or a tubing.

12. The article of claim 1 , wherein the substrate is a sign or a commercial graphic.

13. The article of claim 1 , wherein the substrate is a refrigeration system, a cooling element, or a heat exchanger.

14. The article of claim 1 , wherein the substrate is a wind mill or a turbine.

15. The article of claim 1 , wherein the substrate is a solar cell.

16. The article of claim 1 , wherein the substrate is an avionic device.

17. The article of claim 1 , wherein the substrate is a marine vessel or an underwater device.

18. The article of claim 1 , wherein the substrate is a fabric.

19. The article of claim 1 , wherein the roughness factor is selected to provide a critical surface energy that is higher than the surface energy of the lubricating liquid.

20. The article of claim 1 , further comprising a reservoir in fluid communication with the lubricating liquid to replenish the lubricating liquid.

Assignees

• Harvard College

Inventors

• Aizenberg Joanna
• Aizenberg Michael
• Kang Sung Hoon
• Kim Philseok
• Wong Tak Sing

Classifications

• C09D5/1681

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

• Y10T428/24355

  Continuous and nonuniform or irregular surface on layer or component [e.g., roofing, etc.] · CPC title

• F28F13/185

  Heat-exchange surfaces provided with microstructures or with porous coatings · CPC title

• B64D15/00

  De-icing or preventing icing on exterior surfaces of aircraft · CPC title

• A61L27/34

  Macromolecular materials · CPC title