Dynamic and switchable slippery surfaces

Patent metadata

Field	Value
Publication number	US-9683197-B2
Application number	US-201414268171-A
Country	US
Kind code	B2
Filing date	May 2, 2014
Priority date	Nov 4, 2011
Publication date	Jun 20, 2017
Grant date	Jun 20, 2017

Abstract

The present disclosure describes a strategy to create self-healing, slippery liquid-infused porous surfaces (SLIPS) that can be modified as desired. 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 objects, referred to herein as Object A (Solid A or Liquid A). Use of an external stimuli or degradation of the Liquid B can be utilized to change the characteristics of SLIPS structures reversibly or irreversibly that may be desired in a number of different applications. Numerous characteristics, such as adhesion, optical, mechanical, and the like, can be dynamically changed.

First claim

What is claimed is:

1. A method of altering one or more characteristics of a structure, the method comprising:
providing a structure comprising a roughened surface which is optionally functionalized to immobilize a lubricating liquid, wherein the lubricating liquid wets and adheres to the roughened surface to form a layer having a smooth planar upper surface over the roughened surface to obtain a first characteristic of the structure; and
applying or removing a first stimulus to the structure, wherein the application or removal of the first stimulus exposes a portion of the underlying substrate or disrupts the smoothness and/or planarity of the upper surface of the lubricating liquid layer to obtain a second characteristic of the structure;
wherein:
the first stimulus comprises heat and wherein the heat stimulus causes temperature-induced melting of a solid lubricant or a change in viscosity of the lubricant; and
the first stimulus is selected to alter the shape, volume or configuration of the underlying substrate, such that the underlying substrate is exposed when the underlying substrate is in an expanded or contracted state.

2. The method of claim 1 , wherein the one or more characteristics comprise at least one of optics, transparency, wettability, adhesion to a first substance which optionally contacts the surface, repellency of a first liquid which optionally contacts the surface or mobility of a first liquid which optionally contacts the surface.

3. The method of claim 1 , wherein the change from the first characteristic of the structure to the second characteristic of the structure occurs gradually or over a continuum.

4. The method of claim 1 , wherein the change from the first characteristic of the structure to the second characteristic of the structure occurs abruptly or completely.

5. The method of claim 1 , wherein the change from the first characteristic of the structure to the second characteristic of the structure is irreversible or reversible, by removal or reduction of the first stimulus or application of a second stimulus.

6. The method of claim 1 , wherein the underlying substrate comprises a shape-changing thermal responsive polymer that undergoes a shape, volume or configuration change upon thermal stimulus.

7. The method of claim 5 , wherein the lubricating liquid comprises additives that respond to the first stimulus.

8. The method of claim 7 , wherein the additives comprises a gelling or polymerization agent and the first stimulus induces polymerization or gelling of the lubricant.

9. A method of altering one or more characteristics of a structure, the method comprising:
providing a structure comprising a roughened surface which is optionally functionalized to immobilize a lubricating liquid, wherein the lubricating liquid wets and adheres to the roughened surface to form a layer having a smooth planar upper surface over the roughened surface to obtain a first characteristic of the structure; and
applying or removing a first stimulus to the structure, wherein the application or removal of the first stimulus exposes a portion of the underlying substrate or disrupts the smoothness and/or planarity of the upper surface of the lubricating liquid layer to obtain a second characteristic of the structure;
wherein:
the first stimulus comprises heat and wherein the heat stimulus causes temperature-induced melting of a solid lubricant or a change in viscosity of the lubricant; and
the surface comprises a plurality of deflectable aspected features and the first stimulus is selected to deflect the aspected features from a first position in which the aspected features are above the lubricant layer to a second position in which the aspected features are below the lubricant layer or vice versa.

10. A method of altering one or more characteristics of a structure, the method comprising:
providing a structure comprising a roughened surface which is optionally functionalized to immobilize a lubricating liquid, wherein the lubricating liquid wets and adheres to the roughened surface to form a layer having a smooth planar upper surface over the roughened surface to obtain a first characteristic of the structure; and
applying or removing a first stimulus to the structure, wherein the application or removal of the first stimulus exposes a portion of the underlying substrate or disrupts the smoothness and/or planarity of the upper surface of the lubricating liquid layer to obtain a second characteristic of the structure;
wherein:
the first stimulus comprises heat and wherein the heat stimulus causes temperature-induced melting of a solid lubricant or a change in viscosity of the lubricant; and
the first stimulus is selected to degrade the underlying substrate surface to reduce the affinity of the lubricant for the surface.

11. The method of claim 5 , wherein the first stimulus is selected to degrade the lubricant to reduce the affinity of the lubricant for the surface.

12. The method of claim 5 , wherein the first stimulus is selected to reduce the shape, volume or configuration of the lubricant to expose the underlying substrate.

13. The method of claim 1 , wherein the removal of the first stimulus and/or the application of a second stimulus re-obtains the first characteristic of the structure.

14. The method of claim 9 , wherein the one or more characteristics comprise at least one of optics, transparency, wettability, adhesion to a first substance which optionally contacts the surface, repellency of a first liquid which optionally contacts the surface or mobility of a first liquid which optionally contacts the surface.

15. The method of claim 9 , wherein the change from the first characteristic of the structure to the second characteristic of the structure occurs gradually or over a continuum.

16. The method of claim 9 , wherein the change from the first characteristic of the structure to the second characteristic of the structure occurs abruptly or completely.

17. The method of claim 9 , wherein the change from the first characteristic of the structure to the second characteristic of the structure is irreversible or reversible, by removal or reduction of the first stimulus or application of a second stimulus.

18. The method of claim 9 , wherein the underlying substrate comprises a shape-changing thermal responsive polymer that undergoes a shape, volume or configuration change upon thermal stimulus.

19. The method of claim 9 , wherein the lubricating liquid comprises additives that respond to the first stimulus.

20. The method of claim 19 , wherein the additives comprises a gelling or polymerization agent and the first stimulus induces polymerization or gelling of the lubricant.

21. The method of claim 9 , wherein the first stimulus is selected to degrade the lubricant to reduce the affinity of the lubricant for the surface.

22. The method of claim 9 , wherein the first stimulus is selected to reduce the shape, volume or configuration of the lubricant to expose the underlying substrate.

23. The method of claim 9 , wherein the removal of the first stimulus and/or the application of a second stimulus re-obtains the first characteristic of the structure.

24. The method of claim 10 , wherein the one or more characteristics comprise at least one of optics, transparency, wettability, adhesion to a first substance which optionally contacts the surface, repellency of a first liquid which optionally contacts the surface or mobility

Assignees

• Harvard College

Inventors

• Aizenberg Joanna
• Hatton Benjamin
• Yao Xi
• Aizenberg Michael
• Wang Wendong

Classifications

• B05D3/12

  by mechanical means · CPC title

• A61L27/50 Primary

  Materials characterised by their function or physical properties {, e.g. injectable or lubricating compositions, shape-memory materials, surface modified materials} · CPC title

• Y10T428/139

  Open-ended, self-supporting conduit, cylinder, or tube-type article · CPC title

• A61L29/146

  Porous materials, e.g. foams or sponges · CPC title

• A61L2400/10

  Materials for lubricating medical devices · CPC title