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Basic Guide to Multilayer Microfluidic Fabrication with Polyimide Tape and Diode Laser.

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  • 1School of Biomolecular Science and Engineering, Vidyasirimedhi Institute of Science and Technology (VISTEC), Wang Chan Valley, Rayong 21210, Thailand.

Micromachines
|February 25, 2023
PubMed
Summary
This summary is machine-generated.

This study introduces a novel, maskless laser-based fabrication method for passively driven capillary microfluidic devices. This technique enables precise control over microchannel dimensions, eliminating the need for external pressure sources in microfluidic applications.

Keywords:
capillarydiode lasermicrofluidicmultilayerpassively drivenpolyimide

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Area of Science:

  • Materials Science and Engineering
  • Microfluidics and Lab-on-a-Chip Technologies
  • Biomedical Engineering

Background:

  • Traditional microfluidic devices rely on external pressure sources for fluid control, limiting their portability and application in static environments.
  • Passively driven capillary microfluidic devices offer a solution by eliminating the need for external pumps, enabling miniaturization and portability.
  • Designing complex functionalities within capillary microfluidics requires precise control over microchannel dimensions and component fabrication.

Purpose of the Study:

  • To introduce a direct, maskless fabrication protocol for creating microchannels and components in passively driven capillary microfluidic devices.
  • To demonstrate the capability of precisely controlling microchannel dimensions (depth and width) using a laser-based method.
  • To validate the fabrication protocol by fabricating and testing a functional component, specifically a trigger valve.

Main Methods:

  • A diode laser and polyimide tape on a polymethyl methacrylate (PMMA) substrate were used for direct, maskless fabrication.
  • Microchannel dimensions were precisely controlled by varying laser power and the number of laser repetitions.
  • A trigger valve was fabricated as a proof-of-concept for the developed fabrication protocol.

Main Results:

  • The laser-based method successfully fabricated microchannels with controllable depths and widths.
  • A functional trigger valve was fabricated, demonstrating the efficacy of the protocol for creating microfluidic components.
  • The fabrication process is rapid and requires minimal components, making it accessible for various research needs.

Conclusions:

  • The developed maskless laser fabrication protocol provides a precise and efficient method for creating passively driven capillary microfluidic devices.
  • This technique overcomes the limitations of external pressure sources, enhancing the portability and applicability of microfluidic systems.
  • The ability to fabricate complex components like trigger valves validates the protocol's potential for diverse microfluidic applications.