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Validity of Capillary Imbibition Models in Paper-Based Microfluidic Applications

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Abstract

Paper-based microfluidics has grown continuously over the last few years. One of the most important characteristics of paper-based microfluidic devices is the ability to pump fluids with the single action of capillary forces. However, fluid flow control in paper-based microfluidic devices has been studied primarily through empirical approaches; and as paper-based microfluidic devices have become more complex, more general and precise models of fluid flow are required. Particularly difficult to model are unsaturated flow conditions, which are critical to the overall performance of paper-based analytical devices, which may contain pre-adsorbed reagents such as indicator particles or antibodies. In this work we propose an objective test and a discussion on the suitability of different models (including a novel model derived here from LET-based models) that represent fluid imbibition dynamics in paper substrates. We reproduce experimental fluid fronts with the best parameter fits of the different models to show their actual capabilities to represent the moisture content function and present an analysis of propagation of uncertainties to obtain a final objective quantification of the quality of model fits. This objective analysis will endow the paper-based microfluidics community with objective information about modeling tools to improve the designs and performance of these devices.

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Data Availability

The datasets generated during and/or analyzed during the current study are available from the corresponding author on reasonable request.

Notes

  1. The set of physicochemical hypotheses of this model is described in the supporting information.

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Funding

This research was supported by CONICET, ANPCyT (Grant PICT 2018-02920), UTN (Grant PID ASUTNFE0005525) UNL(Grant CAI+D 50620190100114LI), Argentina and by the Coordenação de Aperfeiçoamento de Pessoal de Nível Superior - Brasil (CAPES) - Finance Code 001.

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Authors and Affiliations

  1. Centro de Investigación en Métodos Computacionales (CIMEC, UNL–CONICET), Colectora RN 168 km 472, S3000GLN, Santa Fe, Argentina

    Gabriel S. Gerlero & Pablo A. Kler

  2. Computational Modeling Graduate Program, Federal University of Juiz de Fora, Juiz de Fora, MG, Brazil

    Andrés R. Valdez

  3. Instituto de Física del Litoral (IFIS Litoral, UNL–CONICET), Güemes 3450, S3000GLN, Santa Fe, Argentina

    Raúl Urteaga

  4. Departamento de Ingeniería en Sistemas de Información, FRSF-UTN, Lavaise 610, S3004EWB, Santa Fe, Argentina

    Pablo A. Kler

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  1. Gabriel S. Gerlero
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  3. Raúl Urteaga
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  4. Pablo A. Kler
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Correspondence to Pablo A. Kler.

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Gerlero, G.S., Valdez, A.R., Urteaga, R. et al. Validity of Capillary Imbibition Models in Paper-Based Microfluidic Applications. Transp Porous Med 141, 359–378 (2022). https://doi.org/10.1007/s11242-021-01724-w

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