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Micromachines 2016, 7(5), 73;

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

Faculty of Engineering and Applied Science, University of Ontario Institute of Technology, 2000 Simcoe Street North, Oshawa, ON L1H 7K4, Canada
Author to whom correspondence should be addressed.
Academic Editors: Sergey S. Shevkoplyas and Nam-Trung Nguyen
Received: 31 January 2016 / Revised: 3 April 2016 / Accepted: 18 April 2016 / Published: 25 April 2016
(This article belongs to the Special Issue Paper-Based Microfluidic Devices for Point-of-Care Diagnostics)
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Fluid flow behaviour in paper is of increasing interest due to the advantages and expanding use of microfluidic paper-based analytical devices (known as µPADs). Applications are expanding from those which often have low sample fluid volumes, such as diagnostic testing, to those with an abundance of sample fluid, such as water quality testing. The rapid development of enhanced features in μPADs, along with a need for increased sensitivity and specificity in the embedded chemistry requires understanding the passively-driven fluid motion in paper to enable precise control and consistency of the devices. It is particularly important to understand the influence of parameters associated with larger fluid volumes and to quantify their impact. Here, we experimentally investigate the impacts of several properties during imbibition in paper, including geometry (larger width and length) and the surrounding conditions (humidity and temperature) using abundant fluid reservoirs. Fluid flow velocity in paper was found to vary with temperature and width, but not with length of the paper strip and humidity for the conditions we tested. We observed substantial post-wetting flow for paper strips in contact with a large fluid reservoir. View Full-Text
Keywords: paper-based devices; paper microfluidics; imbibition; environmental monitoring paper-based devices; paper microfluidics; imbibition; environmental monitoring

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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited (CC BY 4.0).

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Walji, N.; MacDonald, B.D. Influence of Geometry and Surrounding Conditions on Fluid Flow in Paper-Based Devices. Micromachines 2016, 7, 73.

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