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A Paired Bead and Magnet Array for Molding Microwells with Variable Concave Geometries
Published on: January 28, 2018
Fabrication of microfluidic devices containing patterned microwell arrays
W Hampton Henley1, Patty J Dennis, J Michael Ramsey
1Department of Chemistry, University of North Carolina at Chapel Hill, Chapman Hall CB#3216, Chapel Hill, North Carolina 27599, USA.
Analytical Chemistry
|January 17, 2012
Summary
A new method rapidly fabricates microfluidic devices with tiny microwells using a single PDMS layer. This technique enables efficient prototyping for applications like multiplexed immunoassays and DNA analysis.
Area of Science:
- Microfluidics
- Materials Science
- Biotechnology
Background:
- Conventional microfluidic device fabrication often requires multi-element assembly for intricate features.
- Integrating sub-10 μm microwell arrays into microfluidic systems presents significant manufacturing challenges.
Purpose of the Study:
- To present a rapid fabrication and prototyping technique for single-layer microfluidic devices incorporating sub-10 μm microwell arrays.
- To demonstrate a facile method for producing functional microfluidic chips using polydimethylsiloxane (PDMS) and glass substrates.
Main Methods:
- Fabrication of a monolithic glass master mold using wet-chemical etching for larger features (≥20 μm) and focused ion beam (FIB) milling for smaller features (≤10 μm).
- Production of PDMS/glass hybrid chips via molding and oxygen plasma bonding.
- Loading microwell structures with antibody-functionalized, dye-encoded polystyrene spheres for sandwich immunoassay demonstration.
Main Results:
- Successful integration of sub-10 μm microwell arrays within a single layer of microfluidic circuitry.
- Demonstration of a proof-of-principle sandwich immunoassay for cytokines using the fabricated chips.
- Achieved rapid prototyping of microfluidic devices with high-resolution features.
Conclusions:
- The presented technique offers a rapid and facile approach for fabricating complex microfluidic devices.
- This method is suitable for rapid prototyping and applications requiring precise micro- and submicrometer-sized features.
- Potential applications include high-throughput immunoassays, DNA/RNA analysis, and enzyme-linked immunosorbent assays (ELISA).
