Liquid Repellent Slippery Surfaces via Aromatic Polymer and Natural Lubricant
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Solution Overview
Problem
Existing liquid repellent slippery surfaces (SLIPS) face challenges such as the need for antimicrobial additives like triclosan and silver, which raise environmental and resistance concerns, and limitations in material range and geometry due to specific fabrication techniques, particularly for non-porous substrates and complex geometries.
Innovation Solution
Development of a liquid repellent slippery surface comprising a substrate with a polymer layer containing aromatic rings, impregnated with aliphatic lubricants like rapeseed oil or cinnamaldehyde, which provides antimicrobial properties without the need for toxic additives, and can be applied using pulsed plasma deposition for broad compatibility and efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If antimicrobial additives like triclosan or silver are incorporated into SLIPS, then antimicrobial activity is improved, but environmental toxicity and antimicrobial resistance worsen
Solution Approach 1:
The patent extracts and removes the harmful antimicrobial additives (triclosan, silver) from the SLIPS system while preserving the liquid repellent function. The lubricant itself is selected to provide antimicrobial activity through natural properties (e.g., cinnamaldehyde, essential oils) rather than through added toxic substances, thereby eliminating environmental toxicity and resistance concerns associated with conventional antimicrobial agents
Solution Approach 2:
The patent employs biodegradable, environmentally benign lubricants (such as plant-based oils and natural compounds like cinnamaldehyde) that can be easily replaced or degraded, replacing persistent toxic antimicrobial additives. These lubricants provide temporary antimicrobial protection through their chemical properties without creating long-term environmental harm or resistance issues
2Reliability
If hydrothermal treatment or electroplating is used to fabricate SLIPS, then liquid repellency is improved, but material range and geometry applicability worsen
Solution Approach 1:
The patent employs a universal dip-coating methodology that can be applied to virtually any substrate material (metal, polymer, ceramic, glass) and any geometry (flat, curved, porous, non-porous). This single fabrication approach replaces multiple specialized techniques (hydrothermal treatment for inorganics, electroplating for metals) with one universal process that achieves comparable liquid repellency across diverse materials and shapes
Solution Approach 2:
The patent controls the fabrication process through adjustable parameters (coating solution composition, dip rate, drying temperature, lubricant selection) rather than requiring specific material properties or complex equipment. By varying these parameters, the same dip-coating process can be optimized for different substrate types and geometries, achieving broad adaptability without sacrificing liquid repellent performance
3Reliability
If layer-by-layer deposition is used to create polymer layers, then surface affinity towards lubricant is improved, but coating time and process complexity worsen
Solution Approach 1:
The patent combines the polymer layer deposition and lubricant impregnation steps into a single dip-coating operation. The coating solution contains both the polymer precursor and lubricant, allowing simultaneous formation of the affinity layer and infiltration of the lubricant. This merged process eliminates the need for separate layer-by-layer deposition steps and subsequent lubricant impregnation, dramatically reducing coating time while maintaining strong surface affinity
Solution Approach 2:
The patent incorporates the lubricant into the polymer coating solution before deposition, so that the lubricant is pre-positioned within the forming polymer matrix. This preliminary incorporation ensures strong surface affinity from the outset and eliminates the need for time-consuming post-deposition lubricant impregnation steps, reducing overall process time while maintaining effective lubricant-surface interaction
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 solution achieves effective liquid repellency and antimicrobial activity against bacteria like Staphylococcus aureus and Escherichia coli, with low water contact angle hysteresis and sliding angles, while being environmentally friendly and applicable to various substrates, including non-porous materials.
Implementation Method 1
said substrate surface functionalised via the deposition of a polymer layer thereon; wherein said polymer layer comprises an aromatic ring-containing polymer layer
Implementation Method 2
a lubricant impregnated into the polymer layer, thereby forming said liquid repellent slippery surface
Implementation Method 3
The lubricant must be able to wet and adhere to the host surface in preference to the liquid which is being repelled
Data Source
AI summary
The present invention provides liquid repellent slippery surfaces and methods or preparing the same. The surface comprises a substrate, the substrate surface being functionalised via the deposition of a polymer layer thereon, and a lubricant impregnated into the polymer layer, thereby forming said liquid repellent slippery surface. The polymer layer comprises an aromatic ring-containing polymer layer; and the lubricant is an aliphatic compound, rapeseed oil, olive oil, vacuum pump oil, cinnamaldehyde a cinnamaldehyde derivative, essential oil or an essential oil-derived compound. The present invention also provides a liquid repellent slippery surface, wherein the surface comprises a substrate and associated substrate surface, the substrate surface functionalised via the deposition of a polymer layer thereon. The polymer layer is formed from a functional monomer precursor comprising a siloxane-group containing monomer or an alkyl-group containing monomer.