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Surface tension is crucial to capillarity. It results from cohesive forces between liquid molecules at the liquid-air boundary, forming a skin that resists external forces. When the capillary tube...
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Using Adhesive Patterning to Construct 3D Paper Microfluidic Devices
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Rational design of capillary-driven flows for paper-based microfluidics.

Emanuel Elizalde1, Raúl Urteaga, Claudio L A Berli

  • 1IFIS-Litoral (UNL-CONICET) Güemes 3450, 3000, Santa Fe, Argentina.

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This study models fluid transport in paper-based assays, enabling precise control for multi-step processes. The findings aid in designing accurate and reproducible paper diagnostic devices.

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Area of Science:

  • Biomaterials Science
  • Fluid Dynamics
  • Microfluidics

Background:

  • Paper-based assays require precise fluid control for multi-step processes.
  • Passive pumping in these assays depends on substrate geometry for fluid transport.
  • Accurate and reproducible fluid handling is critical for assay reliability.

Purpose of the Study:

  • To theoretically investigate capillary imbibition in paper-like substrates.
  • To understand fluid transport based on macroscopic flow domain geometry.
  • To develop a method for designing paper-based assays with controlled fluid transport.

Main Methods:

  • Derivation of a fluid dynamic model for homogeneous porous substrates.
  • Modeling fluid transport in arbitrary cross-sectional shapes.
  • Extension of the model to slit microchannels and experimental validation.

Main Results:

  • A model determining cross-sectional profiles for prescribed fluid velocity or mass transport rates was developed.
  • The model accurately predicts fluid transport in paper-like substrates.
  • Experimental validation confirmed the model's efficacy in prototype designs.

Conclusions:

  • The developed fluid dynamic model is a valuable tool for the rational design of paper-based assays.
  • Precise programming of fluid transport through substrate geometry is achievable.
  • This approach enhances the accuracy and reproducibility of paper diagnostic devices.