Liquid-Infused Container Surfaces for Self-Healing Repellency
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Solution Overview
Problem
Current liquid-repellent surfaces lack effectiveness in repelling a wide range of foreign materials and maintaining their properties under various conditions, such as high pressures and temperatures, and do not self-clean or self-heal efficiently.
Innovation Solution
A slippery surface is created by applying a lubricating liquid to a roughened substrate, where the liquid is chemically inert to the foreign material and has a greater affinity for the substrate than the foreign material, forming a stabilized overlayer that repels foreign materials and maintains its properties under pressure and temperature variations, with the option of a self-replenishing reservoir.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a liquid-repellent surface is created using conventional methods, then it may repel water or specific liquids, but it fails to repel a wide range of foreign materials including solids, liquids, and gases under various conditions
Solution Approach 1:
The patent introduces a lubricating liquid as an intermediary substance between the solid substrate and foreign materials. This lubricating liquid forms a liquid overlayer that acts as a mediator, providing universal repellant properties against diverse foreign materials including solids, liquids, and gases. The lubricating liquid's chemical inertness and ability to form a stable overlayer enable the surface to repel a wide range of materials while maintaining consistent properties under various conditions.
Solution Approach 2:
The patent creates a composite surface structure combining a solid substrate with a lubricating liquid overlayer. This composite system integrates the mechanical stability of the solid substrate with the versatile repellant properties of the lubricating liquid, achieving both broad-spectrum repellant capability and reliability under varying conditions including high pressure and temperature.
2Extent of automation
If a liquid-repellent surface is created using conventional methods, then it may provide some repellant properties, but it lacks self-cleaning and self-healing efficiency
Solution Approach 1:
The patent implements self-service functionality through the lubricating liquid's ability to automatically replenish and maintain the liquid overlayer. The system self-heals by re-forming the lubricating liquid layer after disturbance, and self-cleans by preventing foreign material adhesion through the slippery surface. This automatic maintenance mechanism ensures continuous repellant properties without external intervention.
Solution Approach 2:
The patent applies preliminary action by pre-coating the substrate with lubricating liquid to form a protective liquid overlayer before foreign materials can adhere. This pre-established lubricating layer proactively prevents contamination and damage, enabling the surface to repel foreign materials and maintain its properties before any degradation occurs.
3Reliability
If a lubricating liquid is applied to a roughened substrate to form a liquid overlayer, then it can repel foreign materials, but the liquid may be displaced under high pressure or temperature variations
Solution Approach 1:
The patent applies local quality by creating a roughened substrate surface with specific microstructures that locally enhance the retention of lubricating liquid. The roughened surface provides anchoring points and capillary structures that locally constrain the lubricating liquid, preventing its displacement under high pressure or temperature variations while maintaining the overall liquid overlayer integrity.
Solution Approach 2:
The patent utilizes a roughened substrate that functions as a porous or microstructured material to retain the lubricating liquid. The roughened surface structure creates capillary forces and physical anchoring that hold the lubricating liquid in place, ensuring the liquid overlayer remains stable and undisturbed even under high pressure and temperature conditions.
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
The surface effectively repels a broad spectrum of materials, including liquids, solids, and gases, maintains low friction, and exhibits self-cleaning and self-healing properties, even under high pressure and temperature conditions, with prolonged functionality due to the self-replenishing mechanism.
Implementation Method 1
a lubricating liquid wetting and adhering to the roughened surface to form a stabilized liquid overlayer
Implementation Method 2
the roughened surface and the lubricating liquid have an affinity for each other such that the lubricating liquid is substantially immobilized on the substrate
Implementation Method 3
forming a stabilized liquid overlayer that repels foreign materials and maintains its properties under pressure and temperature variations
Data Source
AI summary
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.