Hydrophobic Surface Manufacturing via Particle Impact Structuring
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Solution Overview
Problem
Existing methods are unable to produce extremely hydrophobic surfaces on large materials in a controlled and adjustable manner suitable for commercial-scale production, particularly for creating optically impeccable surfaces.
Innovation Solution
The method involves using impaction nozzles to separate particles of specific sizes from a particle spray, directing them to structure the surface, and subsequent gas deposition for alternate surface reactions to achieve a hydrophobic coating, allowing for both micro and nanostructures to be created on the surface.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If lithographic methods or multi-step etching processes are used to create micro/nanostructures, then manufacturing precision and surface uniformity are improved, but device complexity and production cost increase significantly
Solution Approach 1:
The patent replaces complex chemical etching and lithographic processes with a mechanical particle impact system. High-velocity particles are directed at the substrate to physically erode and create micro/nanostructures, eliminating the need for multiple chemical processing steps, masks, and etching chambers while achieving comparable or superior surface precision
Solution Approach 2:
The invention extracts and isolates the structuring function from the coating process. By using particle impact to create structures first, then separately applying hydrophobic coating, the method separates the complex multi-step lithography-etching-coating sequence into independent, simpler stages that can be optimized individually
2Reliability
If uniform microscale structures are created on large surfaces, then flow resistance reduction and hydrophobicity are improved, but manufacturing scalability and cost-effectiveness deteriorate
Solution Approach 1:
The patent uses a particle spray system where particles are accelerated through gas flow and directed at the substrate. This pneumatic delivery mechanism enables uniform coverage of large surfaces through aerosol-like particle distribution, achieving scalable production while maintaining consistent microstructure quality across the entire surface area
Solution Approach 2:
The process segments the structuring and coating operations into distinct steps. Particle impact creates the microstructure in one stage, and hydrophobic coating is applied separately in another stage. This segmentation allows each process to be optimized independently and facilitates scaling to large surface areas by treating different regions sequentially or in parallel
3Ease of manufacture
If particle spray structuring is used to create micro/nanostructures, then ease of manufacture and scalability are improved, but manufacturing precision and surface uniformity worsen
Solution Approach 1:
The patent controls surface structure precision by adjusting particle parameters including size distribution, velocity, concentration, and incident angle. By optimizing these parameters, the simple particle spray method achieves precise and uniform micro/nanostructures without requiring complex equipment or multi-step processes
Solution Approach 2:
The particle spray is applied in controlled pulses or cycles rather than continuously, allowing for precise deposition control. This periodic application ensures uniform particle distribution and prevents aggregation, maintaining surface uniformity while keeping the manufacturing process simple and scalable
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
This approach enables the production of extremely hydrophobic surfaces in a controlled and adjustable manner on large surfaces, making them suitable for industrial-scale production and ensuring high optical quality.
Implementation Method 1
directing them to structure the surface, and subsequent gas deposition for alternate surface reactions
Implementation Method 2
coating the structured surface with a hydrophobic material
Data Source
AI summary
The invention relates to a method and an apparatus for producing a hydrophobic surface on to a material. The invention involves directing at a surface to be structured a particle spray structuring the surface so as to structure the surface, and coating the structured surface with a hydrophobic material. According to the invention, particles larger than a determined size d2 are separated from the particle spray by at least one impaction nozzle, which particles are directed at the surface to be structured such that they collide with the surface to be structured, producing a structure thereon. Next, the structured surface is coated by a gas deposition method in which the structured surface is subjected to alternate surface reactions of starting materials.