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A polymeric master replication technology for mass fabrication of poly(dimethylsiloxane) microfluidic devices
Hai-Fang Li1, Jin-Ming Lin, Rong-Guo Su
1Research Center for Eco-Environmental Sciences, Key Laboratory of Environmental Chemistry and Ecotoxicology, Chinese Academy of Sciences, Beijing 100 085, China.
Electrophoresis
|April 7, 2005
Summary
A new method creates multiple low-cost polymeric masters from a glass mold for efficient poly(dimethylsiloxane) (PDMS) microfluidic device production. This technique enables rapid, high-fidelity replication for applications like laser-induced fluorescence detection.
Area of Science:
- Microfluidics
- Materials Science
- Analytical Chemistry
Background:
- Microfluidic devices offer advantages in sample manipulation and analysis.
- Current methods for fabricating microfluidic devices can be costly and time-consuming.
- The need for scalable and cost-effective production of microfluidic devices is critical for widespread adoption.
Purpose of the Study:
- To develop a low-cost and efficient protocol for producing multiple polymeric masters for microfluidic device fabrication.
- To enable the mass production of poly(dimethylsiloxane) (PDMS)-based microfluidic devices.
- To demonstrate the utility of the fabricated PDMS devices for laser-induced fluorescence (LIF) detection.
Main Methods:
- Fabrication of an original glass master mold using standard wet-etching techniques.
- Rapid replication of over 50 polymethylmethacrylate (PMMA) positive replica masters from the glass mold using thermal printing (20 min per master).
- Casting of PDMS microfluidic devices from the PMMA replica masters, including channels for LIF detection.
Main Results:
- High-fidelity replication of microfluidic channels (26 µm depth, 0.89% variation) and optical fiber channels (90 µm depth, 1.16% variation) from PMMA masters.
- Excellent master-to-master reproducibility with low relative standard deviations (RSDs) for channel width (1.06%) and depth (0.46%).
- Successful characterization and application of PDMS devices for the separation of fluorescein isothiocyanate (FITC)-labeled epinephrine.
Conclusions:
- The developed protocol provides a low-cost, efficient, and scalable method for producing PDMS microfluidic devices.
- The PMMA replica masters are durable and enable high-reproducibility fabrication of complex microfluidic geometries.
- The fabricated PDMS devices are suitable for sensitive analytical applications, such as LIF-based separation.