Articles for manipulating impinging liquids and methods of manufacturing same

Patent metadata

Field	Value
Publication number	US-9254496-B2
Application number	US-201113300022-A
Country	US
Kind code	B2
Filing date	Nov 18, 2011
Priority date	Aug 3, 2011
Publication date	Feb 9, 2016
Grant date	Feb 9, 2016

Abstract

This invention relates generally to an article that includes a non-wetting surface having a dynamic contact angle of at least about 90°. The surface is patterned with macro-scale features configured to induce controlled asymmetry in a liquid film produced by impingement of a droplet onto the surface, thereby reducing time of contact between the droplet and the surface.

First claim

What is claimed is:

1. An article comprising a non-wetting surface having a dynamic contact angle of at least about 90°, said surface comprising non-wetting features, said surface patterned with macro-scale features having a length scale L m that is larger than a length scale L n of the non-wetting features, the macro-scale features being configured to induce controlled asymmetry in a liquid film produced by impingement of a droplet onto the surface, thereby reducing contact time t c between the droplet and the surface to a value lower than
2.2(( ρR^ 3)/γ)^(½)(1+φ/4)

where the droplet has a radius R, density ρ, surface tension γ, and the patterned surface having a pinning fraction φ of zero.

2. The article of claim 1 , wherein the non-wetting surface is superhydrophobic.

3. The article of claim 1 , wherein the non-wetting surface is superoleophobic.

4. The article of claim 1 , wherein the non-wetting surface is supermetallophobic.

5. The article of claim 1 , wherein the non-wetting features are nanoscale pores.

6. The article of claim 1 , wherein the surface is heated above its Leidenfrost temperature.

7. The article of claim 1 , wherein the macro-scale features comprise ridges having height A r and spacing λ r , with A r /h greater than about 0.01 and λ r /A r greater than or equal to about 1, wherein h is lamella thickness of the droplet upon droplet impingement onto the surface.

8. The article of claim 1 , wherein the macro-scale features comprise ridges having height A r and spacing λ r , with A r /h from about 0.01 to about 100 and λ r /A r greater than or equal to about 1, wherein h is lamella thickness of the droplet upon droplet impingement onto the surface.

9. The article of claim 1 , wherein the macro-scale features comprise ridges having height A r and spacing λ r , with A r /h from about 0.1 to about 10 and λ r /A r greater than or equal to about 1, wherein h is lamella thickness of the droplet upon droplet impingement onto the surface.

10. The article of claim 1 , wherein the article is a wind turbine blade, the macro-scale features comprise ridges having height A r and spacing λ r , and wherein 0.0001 mm<A r and λ r ≧0.0001 mm.

11. The article of claim 1 , wherein the article is a rainproof product, the macro-scale features comprise ridges having height A r and spacing λ r , and wherein 0.0001 mm<A r and λ r ≧0.0001 mm.

12. The article of claim 1 , wherein the article is a steam turbine blade, the macro-scale features comprise ridges having height A r and spacing λ r , and wherein 0.00001 mm<A r and λ r ≧0.0001 mm.

13. The article of claim 1 , wherein the article is an exterior aircraft part, the macro-scale features comprise ridges having height A r and spacing λ r , and wherein 0.00001 mm<A r and λ r ≧0.0001 mm.

14. The article of claim 1 , wherein the article is a gas turbine blade, the macro-scale features comprise ridges having height A r and spacing λ r , and wherein 0.00001 mm<A r and λ r ≧0.0001 mm.

15. The article of claim 1 , wherein the macro-scale features comprise protrusions having height A p and whose centers are separated by a distance λ p , with A p /h>0.01 and λ p /A p ≧2, wherein h is lamella thickness of the droplet upon impingement onto the surface.

16. The article of claim 1 , wherein the macro-scale features comprise protrusions having height A p and whose centers are separated by a distance λ p , with 100>A p /h>0.01 and λ p /A p ≧2, wherein h is lamella thickness of the droplet upon impingement onto the surface.

17. The article of claim 1 , wherein the macro-scale features comprise protrusions having height A p and whose centers are separated by a distance λ p , with 10>A p /h>0.1 and λ p /A p ≧2, wherein h is lamella thickness of the droplet upon impingement onto the surface.

18. The article of claim 1 , wherein the macro-scale features are hemispherical protrusions.

19. The article of claim 1 , wherein the article is a wind turbine blade, the macro-scale features comprise protrusions having height A p and whose centers are separated by a distance λ p , and wherein 0.0001 mm<A p and λ p ≧0.0002 mm.

20. The article of claim 1 , wherein the article is a rainproof product, the macro-scale features comprise protrusions having height A p and whose centers are separated by a distance λ p , and wherein 0.0001 mm<A p and λ p ≧0.0002 mm.

21. The article of claim 1 , wherein the article is a steam turbine blade, the macro-scale features comprise protrusions having height A p and whose centers are separated by a distance λ p , and wherein 0.00001 mm<A p and λ p ≧0.00002 mm.

22. The article of claim 1 , wherein the article is an exterior aircraft part, the macro-scale features comprise protrusions having height A p and whose centers are separated by a distance λ p , and wherein 0.00001 mm<A p and λ p ≧0.00002 mm.

23. The article of claim 1 , wherein the article is a gas turbine blade, the macro-scale features comprise protrusions having height A p and whose centers are separated by a distance λ p , and wherein 0.00001 mm<A p and λ p ≧0.00002 mm.

24. The article of claim 1 , wherein the macro-scale features comprise a sinusoidal profile having amplitude A c and period λ c , with A c /h>0.01 and λ c /A c ≧2, wherein h is lamella thickness of the droplet upon droplet impingement onto the surface.

25. The article of claim 1 , wherein the macro-scale features comprise a sinusoidal profile having amplitude A c and period λ c , with 100>A c /h>0.01 and 500≧λ c /A c ≧2, wherein h is lamella thickness of the droplet upon droplet impingement onto the surface.

26. The article of claim 1 , wherein the macro-scale features comprise a sinusoidal profile having amplitude A c and period λ c , with 50>A c /h>0.1 and 500≧λ c /A c ≧2, wherein h is lamella thickness of the droplet upon droplet impingement onto the surface.

27. The article of claim 1 , wherein the article is a rainproof product, the macro-scale features comprise a sinusoidal profile having amplitude A c and period λ c , and wherein 0.0001 mm<A c and λ c ≧0.0002 mm.

28. The article of claim 1 , wherein the article is a wind turbine blade, the macro-scale features comprise a sinusoidal profile having amplitude A c and period λ c , and wherein 0.0001 mm<A c and λ c ≧0.0002 mm.

29. The article of claim 1 , wherein the article is a steam turbine blade, the macro-scale features comprise a sinusoidal profile having amplitude A c and period λ c , and wherein 0.00001 mm<A c and λ c ≧0.00002 mm.

30. The article of claim 1 , wherein the article is an exterior aircraft part, the macro-scale features comprise a sinusoidal profile having amplitude A c and period λ c , and wherein 0.00001 mm<A c and λ c ≧0.00002 mm.

31. The article of claim 1 , wherein the article is a gas turbine blade, the macro-scale features comprise a sinusoidal profile having amplitude A c and period λ c , and wherein 0.00001 mm<A c and λ c ≧0.00002 mm.

32. The article of claim 1 , wherein the surface comprises an alkane.

33. The article of claim 1 , wherein the surface comprises a fluoropolymer.

34. The article of claim 1 , wherein the surface comprises at least one member selected from the group consisting of teflon, trichloro(1H,1H,2H,2H-perfluorooctyDsilane (TCS

Assignees

• Dhiman Rajeev
• Bird James C
• Kwon Hyukmin
• Varanasi Kripa K
• Massachusetts Inst Technology

Inventors

• Dhiman Rajeev
• Bird James C
• Kwon Hyukmin
• Varanasi Kripa K

Classifications

• B82Y30/00

  Nanotechnology for materials or surface science, e.g. nanocomposites · CPC title

• Y10T428/24355

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

• B08B17/065

  the surface having a microscopic surface pattern to achieve the same effect as a lotus flower · CPC title

• B05D5/02

  to obtain a matt or rough surface · CPC title

• B05B1/26 Primary

  with means for mechanically breaking-up or deflecting the jet after discharge, e.g. with fixed deflectors; Breaking-up the discharged liquid or other fluent material by impinging jets · CPC title