Reinforced composites with repellent and slippery properties
Compositions and processes are disclosed for forming hydrophobic coatings and lubricant-infused surface coatings. Coatings may be applied to various substrates without prior chemical or temperature treatment of the substrates and over large and irregular surfaces. Coatings are self-healing, antifouling, and have enhanced lifetimes.
1. A structure having a slippery surface, the structure comprising:
an abrasion resistant composite structure comprising a porous reinforcing material comprising a three-dimensional mesh and a repellent interfacial material embedded within the porous reinforcing material;
a lubricant-infused surface coating on an exposed surface of the composite structure; and
wherein a height of the repellent interfacial material is equal to or greater than a height of the porous reinforcing material.
2. The structure of claim 1 , wherein the porous reinforcing material comprises stainless steel, or copper, or aluminum, or fiberglass, or carbon fiber, or canvas, or any combination thereof.
3. The structure of claim 1 , wherein the repellent interfacial material comprises a polymer, or an organosilicon compound, or a combination thereof.
4. The structure of claim 1 , wherein the repellent interfacial material comprises at least one of siloxane, silicone, fluoropolymer, methacrylate, polypropylene, polyethylene, cellulose, and silazane.
5. The structure of claim 1 , wherein the lubricant-infused surface coating comprises a fluorocarbon polymer, or a silicone oil, or a combination thereof.
6. The structure of claim 1 , wherein the exposed surface comprising the lubricant-infused surface coating has a surface energy between 10 and 20 mJ/m 2 , or a water contact angle between 90 and 135 degrees, or a water roll-off angle between 1 and 25 degrees, or any combination thereof.
7. The structure of claim 1 , wherein the composite structure further comprises a pore-forming additive.
8. The structure of claim 7 , wherein the pore-forming additive comprises at least one of silica, metal, metal oxide, ceramic, polymer, diatomaceous earth, cellulose or a derivative thereof, sugar, starch, salt, and surfactant.
9. The structure of claim 1 , wherein the porous reinforcing material comprises metal or fiberglass, the repellent interfacial material comprises organosilicon, and the lubricant-infused surface coating comprises silicone oil or a fluorocarbon polymer.
10. The structure of claim 1 , further comprising a biocide, or a corrosion inhibitor, or an antifouling agent, or any combination thereof.
11. The structure of claim 1 , further comprising an external lubricant reservoir, or a substrate, or both.
12. A reinforced structure having a slippery surface, the reinforced structure comprising
a substrate,
a reinforcing material comprising a fibrous mesh,
a repellent material embedded within the reinforcing material and comprising a pore-forming additive that is not removed from the repellent material, and
a lubricant,
wherein an exposed surface of the reinforced structure comprises a lubricant-infused surface coating, and
wherein the reinforcing material and the repellent material together form an abrasion resistant interface between the substrate and the lubricant-infused surface coating.
13. The reinforced structure of claim 12 , wherein the exposed surface comprising the lubricant-infused surface coating has a surface energy between 10 and 20 mJ/m 2 , or a water contact angle between 90 and 135 degrees, or a water roll-off angle between 1 and 25 degrees, or any combination thereof.
14. The reinforced structure of claim 12 , wherein the substrate is chosen from at least one of a floor tile, a wall tile, and a component of an animal enclosure having a surface that contacts an animal, and the reinforced structure further comprises a biocide; or
wherein the substrate is chosen from at least one of a marine vessel, buoy, and pier having a surface that contacts a marine environment, and the reinforced structure further comprises an antifouling agent, or a corrosion inhibitor, or both.
15. The reinforced structure of claim 12 , wherein the reinforcing material comprises metal or fiberglass, the repellent material comprises silicon, and the lubricant-infused surface coating comprises silicone oil or a fluorocarbon polymer.
16. A process for making a slippery durable structure, comprising
combining a repellent material with a porous reinforcing material comprising a three-dimensional mesh by embedding the repellent material within the porous reinforcing material to form an abrasion resistant composite structure wherein a height of the repellent material is equal to or greater than a height of three-dimensional mesh,
delivering a lubricant to the composite structure, and
forming a lubricant-infused surface coating on an exposed surface of the composite structure to provide a slippery surface.
17. The process of claim 16 , wherein the lubricant is delivered to the composite structure through a capillary device in fluid contact with an external lubricant reservoir.
18. A slippery durable structure formed by the process of claim 16 .
19. The structure of claim 1 , wherein the repellent interfacial material fills at least 50% of the pores of the porous reinforcing material.
20. The structure of claim 1 , wherein the interfacial material is a continuous layer of material that completely surrounds the reinforcing material.