Superhydrophobic and oleophobic ceramic polymer composite coating
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Solution Overview
Problem
Current superhydrophobic and oleophobic surfaces lack durability and ease of production, and existing products fail to effectively repel oils due to insufficient geometric features and surface energy, leading to performance issues.
Innovation Solution
A ceramic-polymer composite with fluorinated repeating units, dispersed glass, ceramic, and/or ceramic-polymer particles is formed on a substrate surface, creating a superhydrophobic and oleophobic surface through a combination of the Lotus effect and plastron effect, utilizing a polymer matrix with high aspect ratio particles and a fluorinating agent to enhance surface properties.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If conventional hydrophobic coatings are applied to achieve water repellency, then water contact angle is improved, but oil repellency and durability are insufficient
Solution Approach 1:
The patent applies composite materials by combining a polymer matrix containing fluorinated repeating units with dispersed ceramic particles (such as silica, titania, or zirconia) to create a coating that simultaneously achieves superhydrophobicity, oleophobicity, and enhanced durability. The ceramic particles provide structural stability and abrasion resistance, while the fluorinated polymer provides low surface energy for repellency.
Solution Approach 2:
The patent applies local quality by creating hierarchical surface structures with re-entrant geometries (such as mushroom-shaped or hoodoo-like structures) that locally modify surface properties. These geometric features trap air pockets beneath liquid droplets, enabling the Cassie-Baxter state for both water and oil repellency, while the fluorinated regions provide localized low surface energy.
2Object-affected harmful factors
If re-entrant structures are created to achieve oleophobicity, then oil repellency is improved, but manufacturing complexity increases
Solution Approach 1:
The patent applies parameter changes by systematically optimizing the fluorine content (using fluorinated repeating units with different fluorine substitution patterns), particle size distribution, and volume fraction of ceramic particles to achieve the desired re-entrant structures. By controlling these parameters during coating formation, the complex geometric structures self-organize without requiring complex manufacturing processes.
3Object-affected harmful factors
If fluorinated materials are used to reduce surface energy, then water and oil repellency are improved, but adhesion to substrate and durability are reduced
Solution Approach 1:
The patent applies composite materials where the polymer matrix provides strong adhesion to the substrate through chemical bonding or mechanical interlocking, while the dispersed ceramic particles and fluorinated regions provide durability and repellency. The ceramic particles act as anchors that prevent coating delamination, solving the adhesion-durability problem.
Solution Approach 2:
The patent applies local quality by creating regions of high surface energy (ceramic particle surfaces and polymer-substrate interfaces) for strong adhesion, while maintaining regions of low surface energy (fluorinated outer surfaces) for repellency. This spatial differentiation allows the coating to simultaneously achieve strong substrate bonding and effective water/oil repellency.
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 composite surface achieves long-lasting superhydrophobicity and oleophobicity, maintaining high contact angles and resistance to abrasion, effectively repelling water and oils even after multiple abrasive strokes.
Implementation Method 1
creating a superhydrophobic and oleophobic surface through a combination of the Lotus effect and plastron effect
Implementation Method 2
creating a superhydrophobic and oleophobic surface through a combination of the Lotus effect and plastron effect
Implementation Method 3
The interactions between these materials generally result from van der Waals forces
Implementation Method 4
A ceramic-polymer composite of a polymer with fluorinated repeating units as a matrix having dispersed glass, ceramic, and/or ceramic-polymer particles with fluorinated surfaces
Implementation Method 5
the essential criterion, for having a surface with oleophobicity, is to maintain oil drops in a Cassie-Baxter (CB) state, one where vapor pockets are trapped underneath the liquid
Implementation Method 6
the surface tensions of oily liquids are usually in the range of 20-30 mN/m
Data Source
AI summary
An article having a superhydrophobic or oleophobic ceramic polymer composite surface is formed by the coating of the surface with a fluid comprising a polymer, copolymer, or polymer precursor and a plurality of glass, ceramic, or ceramic-polymer particles. The particles have fluorinated surfaces and at least a portion of the polymer's repeating units that are fluorinated or perfluorinated. The composite can be a cross-linked polymer.