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Study on Improving Thickness Uniformity of Microfluidic Chip Mold in the Electroforming Process
Liqun Du1,2, Tong Yang3, Ming Zhao4
1Key Laboratory for Precision and Non-traditional Machining Technology of Ministry of Education, Dalian University of Technology, Dalian 116024, China. duliqun@dlut.edu.cn.
Micromachines
|November 9, 2018
Summary
This study improved microfluidic chip mold fabrication by addressing uneven thickness. Adding a second cathode during electroforming significantly enhanced mold uniformity, reducing costs and improving accuracy.
Area of Science:
- Materials Science
- Microfluidics Engineering
Background:
- Electroforming microfluidic chip molds often results in uneven thickness.
- This non-uniformity reduces dimensional accuracy and increases production costs.
Purpose of the Study:
- To investigate methods for achieving uniform thickness in electroformed microfluidic chip molds.
- To compare the effectiveness of ultrasonic agitation versus a multi-cathode approach.
Main Methods:
- Investigated ultrasonic agitation (200 kHz, 500 W) for thickness uniformity.
- Employed numerical simulation to study the impact of a second cathode on electroforming.
- Fabricated a microfluidic chip mold using the optimized second cathode method.
Main Results:
- Ultrasonic agitation improved thickness uniformity by up to 30% after 2 hours.
- A 4 mm wide second cathode improved uniformity by ~30% in 2 hours and ~45% in 22 hours.
- The final fabricated mold showed a 50% increase in thickness uniformity, aligning with simulations.
Conclusions:
- Adding a second cathode is a more effective method for improving electroformed microfluidic chip mold thickness uniformity, especially for longer electroforming times.
- This method enhances dimensional accuracy and has the potential to reduce manufacturing costs.
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