Sanitation systems and components thereof having a slippery surface

Patent metadata

Field	Value
Publication number	US-2018187022-A1
Application number	US-201815879526-A
Country	US
Kind code	A1
Filing date	Jan 25, 2018
Priority date	Jan 19, 2011
Publication date	Jul 5, 2018
Grant date	—

Abstract

The present disclosure describes a strategy to create self-healing, slippery liquid-infused porous surfaces. 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). Slippery liquid-infused porous surfaces 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 pressures (up to at least 690 atm). Some exemplary application where slippery liquid-infused porous surfaces 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 comprising a slippery surface capable of reducing adhesion of a foreign material to the article,
wherein the article is a component of a sanitation system; wherein the article comprises: (i) a substrate comprising a roughened surface, and (ii) a lubricating liquid having a chemical affinity for the roughened surface, the lubricating liquid wetting and adhering to the roughened surface to provide a liquid overlayer on the roughened surface, without dewetting from the substrate, to form the slippery surface; and wherein the foreign material comprises waste water, dirt, a fecal matter, urine, blood, a bacterium, a virus, a fungus, a bodily fluid, a tissue, or a combination thereof.

2 . The article according to claim 1 , wherein the article is a toilet or a sink.

3 . The article according to claim 1 , wherein the chemical affinity of the lubricating liquid for the roughened surface is determined by an equilibrium contact angle of less than 90°.

4 . The article according to claim 1 , wherein the roughened surface comprises one or more functional groups chemically attached to the roughened surface; and
wherein the lubricating liquid has a chemical affinity for the one or more functional groups.

5 . The article according to claim 4 , wherein the one or more functional groups are selected from the group consisting of a fluorinated carboxylic acid, a fluorinated phosphonic acid, a fluorinated sulfonic acid, a fluorinated silane, an end-functionalized fluorinated polymer, a straight-chain or branched-chain fluorocarbon, a straight-chain or branched-chain hydrocarbon, and a combination thereof.

6 . The article according to claim 1 , wherein the roughened surface has a predetermined roughness; and
wherein the predetermined roughness is effective to immobilize the lubricating liquid on the roughened surface.

7 . The article according to claim 1 , wherein the substrate comprises a plurality of raised structures; and
wherein the plurality of raised structures have feature sizes ranging from about 10 nm to about 100 μm, and are substantially free of three-dimensionally interconnected pores.

8 . The article according to claim 1 , wherein the substrate comprises a glass, a ceramic, a plastic, a rubber, a metal, or a combination thereof.

9 . The article according to claim 1 , wherein the lubricating liquid is selected from the group consisting of fully or partially fluorinated carboxylic acids, fully or partially fluorinated phosphonic acids, fully or partially fluorinated sulfonic acids, fully or partially fluorinated silanes, fully or partially fluorinated hydrocarbons, fully or partially fluorinated organosilicone compounds, fully or partially fluorinated alkylamines, fully or partially fluorinated alkylsulfides, fully or partially fluorinated alkylsulfoxides, fully or partially fluorinated alkylethers, fully or partially fluorinated cycloethers, fully or partially fluorinated polyethers, fully or partially fluorinated alkylphosphines, fully or partially fluorinated phosphineoxides, liquid hydrocarbons, oils, and mixtures thereof.

10 . The article according to claim 1 , wherein the lubricating liquid comprises an oil.

11 . The article according to claim 10 , wherein the oil is selected from the group consisting of olive oil, canola oil, vegetable oil, sunflower oil, and mixtures thereof.

12 . The article according to claim 1 , wherein the article further comprises a reservoir containing additional lubricating liquid, and
wherein the additional lubricating liquid replenishes the lubricating liquid on the roughened surface.

13 . The article according to claim 12 , wherein the article is a toilet; and
wherein the lubricating liquid is flushed into the toilet bowl to replenish the lubricating liquid on the roughened surface.

14 . The article according to claim 1 , wherein the article is a toilet;
wherein the substrate comprises a ceramic; wherein the roughened surface comprises one or more functional groups chemically attached to the roughened surface; wherein the lubricating liquid has a chemical affinity for the one or more functional groups; and wherein the foreign material comprises a fecal matter, a bodily fluid, or a combination thereof.

15 . A method of reducing adhesion of a foreign material to an article, the method comprising introducing a lubricating liquid to wet and adhere to a roughened surface of a substrate of the article to provide a liquid overlayer on the roughened surface, without dewetting from the substrate, to form a slippery surface;
wherein the article is a component of a sanitation system; wherein the lubricating liquid has a chemical affinity for the roughened surface; wherein the slippery surface reduces adhesion of the foreign material to the article; and wherein the foreign material comprises dirt, a fecal matter, a bacteria, a virus, a fungus, a bodily fluid, a tissue, or a combination thereof.

16 . The method according to claim 15 , wherein the article is a toilet or a sink.

17 . The method according the claim 15 , further comprising chemically functionalizing the roughened surface with one or more functional groups prior to introducing the lubricating liquid;
wherein the lubricating liquid has a chemical affinity for the one or more functional groups.

18 . The method according to claim 15 , further comprising roughening the substrate by mechanical or (electro)chemical methods to produce the roughened surface prior to introducing the lubricating liquid.

19 . The method according to claim 18 , wherein the roughening step produces a roughened surface having a predetermined roughness; and
wherein the predetermined roughness is effective to immobilize the lubricating liquid on the roughened surface.

20 . The method according to claim 15 , wherein the lubricating liquid is selected from the group consisting of fully or partially fluorinated carboxylic acids, fully or partially fluorinated phosphonic acids, fully or partially fluorinated sulfonic acids, fully or partially fluorinated silanes, fully or partially fluorinated hydrocarbons, fully or partially fluorinated organosilicone compounds, fully or partially fluorinated alkylamines, fully or partially fluorinated alkylsulfides, fully or partially fluorinated alkylsulfoxides, fully or partially fluorinated alkylethers, fully or partially fluorinated cycloethers, fully or partially fluorinated polyethers, fully or partially fluorinated alkylphosphines, fully or partially fluorinated phosphineoxides, liquid hydrocarbons, oils, and mixtures thereof.

21 . The method according to claim 15 , wherein the lubricating liquid comprises an oil.

22 . The method according to claim 21 , wherein the oil is selected from the group consisting of olive oil, canola oil, vegetable oil, sunflower oil, and mixtures thereof.

23 . The method according to claim 15 , wherein the article further comprises a reservoir and the method further comprises introducing additional lubricating liquid to the reservoir;
wherein the additional lubricating liquid replenishes the lubricating liquid on the roughened surface.

24 . The method according to claim 23 , wherein the article is a toilet and the method further comprises flushing the additional lubricating liquid into the toilet bowl to replenish the lubricating liquid on the roughened surface.

25 . The method according to claim 15 ,

Assignees

• Harvard College

Inventors

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

Classifications

• Y02W10/37

  using solar energy · CPC title

• A61L27/28

  Materials for coating prostheses · CPC title

• A61L33/0094

  Physical treatment, e.g. plasma treatment · CPC title

• F01D25/18

  Lubricating arrangements (of machines or engines in general F01M) · CPC title

• F15D1/02

  in pipes or conduits · CPC title