Maskless Laser Patterning of Metal Alloys for Stable Wettability Regions
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing methods for creating wettability-patterned surfaces, such as superhydrophobic-superhydrophilic patterns on metal alloys, are time-consuming and costly due to the need for masking and multiple processing steps, and existing laser-based techniques struggle with surface chemistry stability and low processing efficiency.
Innovation Solution
A laser-based functionalization method that decouples extreme wettability from surface topography, allowing for maskless fabrication of superhydrophobic-superhydrophilic patterns on metal alloys by independently controlling surface structures and chemistry through laser processing and chemical treatments, enabling high-throughput and flexible surface engineering.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If masking methods are used to fabricate wettability-patterned surfaces, then selective processing of extreme wetting areas is achieved, but processing time and cost increase due to multiple steps
Solution Approach 1:
The patent extracts and removes the masking step from the conventional multi-step process. By using laser-based direct writing to deposit precursor materials only in desired patterns without masks, the method eliminates the time-consuming mask application and removal steps while maintaining selective processing precision.
Solution Approach 2:
The patent replaces the mechanical masking system with a laser-based direct writing system. Instead of physically applying and removing mask layers, the laser directly deposits precursor materials in the desired pattern, substituting mechanical operations with optical/thermal energy-based processing.
2Manufacturing precision
If multiple processing steps are used to create wettability patterns, then selective area treatment is achieved, but device complexity and cost increase
Solution Approach 1:
The patent merges multiple separate processing steps into a single integrated laser-based direct writing process. The laser system performs precursor deposition, pattern formation, and surface modification in one unified operation, eliminating the need for separate masking, chemical treatment, and mask removal steps.
Solution Approach 2:
The laser-based direct writing system serves multiple functions simultaneously: it acts as a patterning tool, a deposition source, and a surface treatment device. This multi-functional approach replaces the need for multiple specialized equipment and processing steps.
3Productivity
If conventional laser texturing is used to create superhydrophilic surfaces, then surface structures are formed, but wettability stability deteriorates due to atmospheric exposure
Solution Approach 1:
The patent applies preliminary chemical modification by depositing precursor materials and performing in-situ polymerization or crosslinking before atmospheric exposure. This preliminary action creates a stable chemical layer that prevents subsequent wettability changes when exposed to atmospheric conditions, thereby stabilizing the superhydrophilic properties.
Solution Approach 2:
The patent creates composite surface structures combining laser-textured metal substrates with polymer or organic coating layers. This composite structure maintains the beneficial surface morphology from laser texturing while the added chemical layer provides stability against atmospheric degradation and wettability drift.
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 method achieves stable and efficient fabrication of large-area wettability patterns with precise control over surface topography and chemistry, reducing processing time and costs while maintaining wettability stability, and can treat complex surfaces with high precision and flexibility.
Implementation Method 1
first treating at least one portion of a first major surface of a metal piece along a laser scan path to obtain a first treated surface
Implementation Method 2
second treating the first treated surface with a composition comprising a hydrophobic surface modifier to obtain a hydrophobic first treated surface
Implementation Method 3
third treating at least one portion of the hydrophobic first treated surface of the metal piece along a laser scan path to obtain a second treated surface
Implementation Method 4
fourth treating the second treated surface with a composition comprising a hydrophilic surface modifier to obtain a hydrophilic first treated surface
Data Source
AI summary
The disclosure relates to maskless, laser-assisted methods for making a metal surface comprising at least one of hydrophobic and hydrophilic regions; and at least one of micro- and nanostructured regions.