Patterned Substrate With Hydrophilic And Hydrophobic Areas
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Solution Overview
Problem
Existing patterned substrates are not mechanically stable and are incompatible with forming microdroplet arrays of fluids with lower surface tension than water, often requiring complex topography that compromises mechanical strength and transparency.
Innovation Solution
A patterned substrate with a flat surface featuring hydrophilic and hydrophobic areas created by covalently binding thioether groups via a dialkyl silyl linker to a glass surface, allowing for adjustable contact angles and high-density microdroplet formation without compromising mechanical stability or transparency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If complex surface topography (overhang or pinecone-like structures) is used to create superoleophobic surfaces, then compatibility with low surface tension liquids is improved, but mechanical strength and transparency are compromised
Solution Approach 1:
The patent applies local quality by creating hydrophobic areas with specific chemical composition (fluorinated thioether groups) at predetermined locations on the substrate surface. This allows the surface to have different wetting properties in different regions without requiring complex global topography, thereby maintaining mechanical strength while achieving compatibility with low surface tension liquids.
Solution Approach 2:
The patent changes the chemical parameters of the surface by using fluorinated thioether groups with specific chain lengths and configurations. By adjusting the fluorinated alkyl chain length and the dialkyl silyl linker structure, the surface energy is modified to achieve superoleophobicity without requiring complex physical topography, thus preserving mechanical properties and transparency.
2Adaptability or versatility
If complex surface topography (overhang or pinecone-like structures) is used to create superoleophobic surfaces, then compatibility with low surface tension liquids is improved, but transparency is compromised
Solution Approach 1:
The patent creates localized hydrophobic regions with fluorinated thioether groups on an otherwise transparent substrate. This localized chemical modification approach maintains the overall transparency of the substrate while providing the necessary surface energy reduction in specific areas to achieve compatibility with low surface tension liquids.
Solution Approach 2:
The patent replaces mechanical/topographical approaches (complex surface structures) with chemical approaches (fluorinated thioether groups). This substitution achieves the same functional effect (superoleophobicity) without the optical side effects, thereby maintaining transparency while achieving compatibility with low surface tension liquids.
3Quantity of substance
If patterned substrates are used to form microdroplet arrays, then high-density microdroplet formation is achieved, but mechanical stability is compromised
Solution Approach 1:
The patent changes the chemical parameters of the surface by introducing fluorinated thioether groups with varying chain lengths and configurations. This chemical parameter adjustment allows the formation of high-density microdroplet arrays while maintaining the mechanical stability of the substrate, as the modification is molecular-level rather than structurally invasive.
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
Enables the formation of high-density microdroplet arrays of low surface tension liquids with improved mechanical stability and transparency, suitable for high-throughput screening and chemical applications, while maintaining excellent transmittance and preventing cross-contamination.
Implementation Method 1
Driven by surface tension, cell-laden hydrogels were assembled on a glass surface patterned with hydrophobic and hydrophilic regions
Implementation Method 2
liquid is moved along a surface possessing strong dewettability with a pattern of highly wettable spots to create an array of pinned droplets
Data Source
Figure 1(A)~1(C)
Figure 2(A)~2(H)
Figure 3(A)~3(F)
AI summary
The present invention relates to a patterned substrate having hydrophilic (wetting) and hydrophobic (dewetting) areas, a method for forming an array of separated homogenous non-aqueous fluid microdroplets, a method for forming a pattern of polymer micropads, and a method for forming a patterned coating of nanoparticles.