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A passive and programmable 3D paper-based microfluidic pump for variable flow microfluidic applications.

Syed Farhad Shah1, Ali Turab Jafry1, Gohar Hussain1

  • 1Faculty of Mechanical Engineering, Ghulam Ishaq Khan Institute of Engineering Sciences and Technology, Topi 23640, Pakistan.

Biomicrofluidics
|December 20, 2022
PubMed
Summary
This summary is machine-generated.

This study explores 3D paper-based passive pumps for microfluidic applications. Results show that increasing pump diameter and porosity enhances water flow rate, enabling programmable fluid control in microchannels.

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Area of Science:

  • Microfluidics
  • Materials Science
  • Biomedical Engineering

Background:

  • Paper is a key material in microfluidic devices, particularly for passive pumping due to its absorptive properties.
  • Previous research focused on 1D and 2D fluid flow in paper microfluidics.
  • The 3D effects of porous geometry on pumping characteristics remain largely unexplored experimentally.

Purpose of the Study:

  • To investigate the 3D fluid flow in paper-based passive pumps within microchannels.
  • To analyze the impact of pump diameter, porosity, and programmability on microfluidic pumping.
  • To evaluate the potential of 3D paper pumps for enhanced flow control and volume transport.

Main Methods:

  • Experimental investigation of fluid flow in 3D cylindrical paper-based passive pumps.
  • Systematic variation of pump diameter and porosity to assess their effects on flow rate.
  • Evaluation of flow rate programmability and total fluid imbibition volume.

Main Results:

  • Water flow rate increased with larger pump diameter and higher porosity.
  • Maximum flow rates of 5.29 mm³/s and 6.97 mm³/s were achieved with 14 mm diameter pumps at 0.5 and 0.7 porosities, respectively.
  • Fluid imbibition volumes ranged from 266 to 567 μl for 8 mm and 14 mm diameter pumps, respectively.
  • A single 3D paper pump demonstrated programmable flow rate control (increasing, decreasing, constant) within one microchannel.

Conclusions:

  • 3D paper-based passive pumps offer improved flow rates, programmability, and control compared to 2D systems.
  • These pumps are cost-effective, simple to fabricate, and capable of transporting larger liquid volumes.
  • The technology holds promise for advancing programmable, cost-effective point-of-care diagnostic devices.