Liquid-Infused Porous Surfaces for Pressure-Stable Self-Healing Repellency
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Solution Overview
Problem
Current liquid-repellent surfaces fail to effectively prevent adhesion of a wide range of materials, including liquids, solids, and gases, and lack durability under varying pressures and temperatures.
Innovation Solution
The development of Slippery Liquid-Infused Porous Surfaces (SLIPS) with a roughened substrate and a chemically inert lubricating liquid that forms a stable, immobilized overlayer, ensuring the liquid has a greater affinity for the substrate than the foreign material, and is replenished through a capillary network for sustained performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a roughened surface with micro/nanostructures is used to create liquid-repellent surfaces, then water-repellency is improved, but adhesion of various materials including liquids, solids, and gases is not effectively prevented
Solution Approach 1:
The patent introduces a lubricating liquid as an intermediary substance between the roughened surface and foreign materials. This liquid infuses into the micro/nanostructures and forms a stable overlayer that actively repels diverse materials including liquids, solids, and gases. The lubricating liquid acts as the mediating element that provides universal repellency, overcoming the limitation of surfaces that only repel water effectively.
Solution Approach 2:
The invention creates a composite structure combining the solid roughened substrate with a lubricating liquid layer. This composite system integrates the mechanical stability of the solid surface with the chemical versatility of the liquid layer, enabling broad-spectrum repellency against multiple types of materials while maintaining the structural integrity provided by the roughened substrate.
2Object-generated harmful factors
If a lubricating liquid is used to form a slippery surface, then adhesion reduction is improved, but stability under varying pressures and temperatures deteriorates
Solution Approach 1:
The patent utilizes the porous micro/nanostructured surface to stabilize the lubricating liquid through capillary forces. The porous structure allows the liquid to infuse deeply and become mechanically interlocked, preventing it from being easily displaced under varying pressures. The high surface area of the porous structure also enhances capillary wicking, which anchors the liquid in place and maintains surface stability under temperature variations.
Solution Approach 2:
The lubricating liquid is pre-applied and allowed to infuse into the roughened surface structure before use. This preliminary action ensures the liquid is already stabilized within the micro/nanostructures, creating a pre-formed slippery layer that is ready to resist adhesion from various materials while maintaining stability under environmental variations.
3Reliability
If the liquid layer thickness is increased to ensure complete surface coverage, then optical transparency deteriorates, but self-healing capability is improved
Solution Approach 1:
The patent creates different liquid layer thicknesses at different locations: thinner layers on the upper surface to maintain optical transparency and aesthetic appearance, and thicker layers within the micro/nanostructures and at the edges to provide self-healing capability. The capillary network distributes liquid locally where needed, allowing the surface to heal scratches or damage by replenishing liquid in affected areas without compromising overall 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 exhibit enhanced repellency and self-healing properties, maintaining functionality under high pressures and temperatures, with reduced adhesion of various materials, including ice and crude oils, while allowing for easy cleaning and anti-fouling characteristics.
Implementation Method 1
a lubricating liquid wetting and adhering to the roughened surface to form a stabilized liquid overlayer
Implementation Method 2
the lubricating liquid wetting and adhering to the roughened surface
Implementation Method 3
the roughened surface and the lubricating liquid have an affinity for each other such that the lubricating liquid is substantially immobilized on the substrate
Data Source
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.