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Updated: Jul 16, 2025

Fabrication of Three-dimensional Paper-based Microfluidic Devices for Immunoassays
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Maximizing flow rate in single paper layer, rapid flow microfluidic paper-based analytical devices.

Iain Macleod Briongos1, Zachary D Call2, Charles S Henry2

  • 1School of Biomedical Engineering, Colorado State University, Fort Collins, CO 80523 USA.

Microfluidics and Nanofluidics
|September 18, 2023
PubMed
Summary

Laser-cut grooves in microfluidic paper-based analytical devices (µPADs) significantly boost fluid flow rates. This innovation enhances the potential of µPADs for point-of-care diagnostics by overcoming previous flow rate limitations.

Keywords:
Flow rateLow volumePaper microfluidicsPoint-of-care

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Area of Science:

  • Biomedical Engineering
  • Materials Science
  • Analytical Chemistry

Background:

  • Microfluidic paper-based analytical devices (µPADs) are promising for point-of-care diagnostics.
  • Low flow rates in µPADs have historically limited their application scope.
  • Optimizing fluid dynamics is crucial for enhancing µPAD performance.

Purpose of the Study:

  • To investigate the impact of laser-cut paper channels on fluid flow rates in µPADs.
  • To determine optimal laser-cutting designs for maximizing flow in small-profile devices.
  • To explore the potential of laser-cut grooves for self-pumping applications.

Main Methods:

  • Fabrication of single-layer µPADs using laser cutting to create paper channels.
  • Comparative analysis of flow rates in devices with single cuts, branching grooves, and uncut paper.
  • Quantitative measurement of fluid flow rates under controlled conditions.

Main Results:

  • Branching, laser-cut grooves demonstrated a 59.23-73.98% improvement in flow rate compared to single cuts.
  • Laser-cut channels achieved a 435% increase in flow rate over devices with paper alone.
  • The study confirmed that laser cutting effectively enhances fluid throughput in µPADs.

Conclusions:

  • Laser cutting of paper channels is an effective strategy to significantly increase flow rates in µPADs.
  • Branching groove designs offer superior flow enhancement compared to single cuts.
  • These findings have implications for developing more efficient and versatile microfluidic devices for various applications, including self-pumping systems.