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PDMS-based microfluidic device with multi-height structures fabricated by single-step photolithography using printed
Cheuk-Wing Li1, Chung Nam Cheung, Jun Yang
1Department of Biology and Chemistry, City University of Hong Kong, 83 Tat Chee Avenue, Kowloon, Hong Kong, China.
The Analyst
|October 8, 2003
Summary
A novel method uses printed circuit board (PCB) technology for fabricating multi-height microfluidic devices without clean rooms. This cost-effective approach enables robust cellular analysis applications.
Area of Science:
- Microfluidics
- Materials Science
- Biotechnology
Background:
- Conventional microfluidic device fabrication often requires specialized cleanroom facilities and complex procedures.
- Developing accessible and cost-effective fabrication methods is crucial for broader adoption of microfluidic technologies.
Purpose of the Study:
- To present a simplified, single-step photolithography method for creating microfluidic devices with multi-height structures.
- To demonstrate the utility of these devices for cellular analysis using accessible fabrication techniques.
Main Methods:
- Utilized conventional printed circuit board (PCB) technology with custom-designed "windows" and "rims" photomasks.
- Fabricated multi-height features on a PCB master via photolithography and chemical wet etching.
- Molded poly(dimethylsiloxane) (PDMS) against the master to create the microfluidic device with "sandbag" structures.
Main Results:
- Successfully fabricated microfluidic devices with integrated multi-height "sandbag" structures and peripheral microchannels.
- Demonstrated device functionality through controlled immobilization of biological cells and immunocytochemical staining assays.
- Confirmed device robustness and stability under applied pressure, suitable for analytical operations.
Conclusions:
- The developed PCB-based photolithography offers a simple, low-cost, and reproducible method for fabricating microfluidic devices.
- This technique eliminates the need for cleanroom facilities, making microfluidic device fabrication more accessible.
- The fabricated devices are suitable for various cellular analysis applications, highlighting their practical utility.