Slippery surfaces with high pressure stability, optical transparency, and self-healing characteristics
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Solution Overview
Problem
Current liquid-repellent surfaces fail to effectively repel a wide range of foreign materials, including liquids and solids, under various environmental conditions and pressures, and lack self-healing and self-cleaning properties.
Innovation Solution
The development of Slippery Liquid-Infused Porous Surfaces (SLIPS) with a roughened surface and a chemically functionalized lubricating liquid that forms an ultra-smooth layer, where the lubricating liquid has a high affinity for the surface and is immiscible with the foreign material, ensuring it remains stable and repels foreign materials by preferentially wetting the surface.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If micro/nanostructures are used to create liquid-repellent surfaces, then water-repellency is improved, but the surface fails to repel a wide range of foreign materials including liquids and solids
Solution Approach 1:
The patent transitions from solid micro/nanostructures to a liquid-infused surface, changing the physical state parameter from solid to liquid. This allows the surface to repel diverse foreign materials including liquids and solids by creating a mobile liquid barrier that can adapt to different contact materials, resolving the contradiction between water-repellency and broad adaptability.
Solution Approach 2:
The patent creates a composite system combining a solid substrate with a liquid lubricating layer. This composite structure integrates the stability of the solid surface with the versatility of the liquid layer, enabling broad repellency against various foreign materials while maintaining the benefits of liquid-repellent properties.
2Reliability
If conventional liquid-repellent surfaces are used, then they provide some repellency, but they fail under various environmental conditions and pressures
Solution Approach 1:
The patent introduces a dynamic liquid layer that can flow and replenish itself on the surface. This dynamic characteristic allows the surface to maintain reliability under varying environmental conditions and pressures, as the liquid can move to fill gaps or repair damaged areas, unlike static solid structures.
Solution Approach 2:
The liquid-infused surface exhibits self-healing properties where the liquid automatically replenishes areas where the repellent layer may be depleted or damaged. This self-service mechanism ensures continuous reliability under various environmental conditions without external intervention.
3Object-affected harmful factors
If solid microstructures are used for repellency, then water-repellency is achieved, but self-healing and self-cleaning properties are lost
Solution Approach 1:
The liquid layer serves itself by automatically flowing to replenish depleted areas and maintaining surface coverage. This self-service capability provides inherent self-healing properties, as the liquid can migrate to repair damaged regions without external intervention, unlike static solid microstructures.
Solution Approach 2:
The liquid layer maintains continuous coverage and mobility on the surface, ensuring uninterrupted self-healing and self-cleaning actions. The continuous presence of the mobile liquid barrier allows ongoing repair and cleaning functions, rather than discrete or static protective actions.
4Quantity of substance
If roughened surfaces are used to increase surface area, then liquid adhesion is improved, but optical transparency is reduced
Solution Approach 1:
The patent uses a thin liquid film to cover the roughened surface, creating a flexible barrier that maintains optical transparency. The liquid film is thin enough to be optically transparent while providing sufficient coverage to adhere to the rough surface and repel foreign materials, resolving the contradiction between adhesion and transparency.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
SLIPS achieves high-pressure stability, self-healing, and omniphobic properties, effectively repelling a broad spectrum of materials, including liquids, solids, and ice, while maintaining low friction and preventing adhesion, even under extreme conditions.
Implementation Method 1
the lubricating liquid can infuse into, wet, and stably adhere within the roughened surface
Implementation Method 2
the roughness factor, R, that is greater than or equal to 1/cosθ, where the roughness factor is defined as the ratio between the real surface area and the projected surface area
Implementation Method 3
the functionalized roughened surface is preferentially wetted by the lubricating liquid rather than the foreign material
Implementation Method 4
the real surface area is measured with an atomic force microscope utilizing an AFM probe
Data Source
Figure 1
Figure 2a~2b
Figure 3A~3B
AI summary
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 pressures (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.