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Influence of Geometry and Surrounding Conditions on Fluid Flow in Paper-Based Devices.

Noosheen Walji1, Brendan D MacDonald2

  • 1Faculty of Engineering and Applied Science, University of Ontario Institute of Technology, 2000 Simcoe Street North, Oshawa, ON L1H 7K4, Canada.

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|November 9, 2018
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Summary

Fluid flow in paper, crucial for microfluidic analytical devices, is influenced by temperature and width. Understanding these factors ensures precise control and consistency in paper-based diagnostics and water quality testing.

Keywords:
environmental monitoringimbibitionpaper microfluidicspaper-based devices

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Area of Science:

  • Fluid dynamics
  • Materials science
  • Analytical chemistry

Background:

  • Microfluidic paper-based analytical devices (µPADs) are increasingly used for diagnostics and water quality testing.
  • Understanding fluid flow in paper is essential for enhancing µPAD sensitivity, specificity, and control.
  • Larger fluid volumes in applications necessitate a deeper understanding of flow dynamics.

Purpose of the Study:

  • To experimentally investigate the impact of geometry, humidity, and temperature on fluid imbibition in paper.
  • To quantify the influence of these parameters, especially with abundant fluid reservoirs.
  • To provide insights for precise control and consistency in µPADs.

Main Methods:

  • Experimental investigation of fluid flow during paper imbibition.
  • Testing the effects of varying paper geometry (width, length) and environmental conditions (humidity, temperature).
  • Utilizing abundant fluid reservoirs for testing.

Main Results:

  • Fluid flow velocity in paper varied significantly with temperature and strip width.
  • Paper strip length and ambient humidity did not show a significant impact on flow velocity under tested conditions.
  • Substantial post-wetting flow was observed in paper strips connected to large fluid reservoirs.

Conclusions:

  • Temperature and width are key parameters influencing fluid flow velocity in paper for µPAD applications.
  • Environmental humidity and paper length have minimal impact on flow dynamics in this context.
  • The findings support improved design and control of µPADs, particularly those handling larger fluid volumes.