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Self-powered microfluidic pump using evaporation from diatom biosilica thin films

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Abstract

In recent years, researchers have successfully applied diatom biosilica to molecular detection platforms including Surface-Enhanced Raman Scattering (SERS) optofluidic sensors that are currently capable of detecting a variety of biological and chemical molecules at concentrations as low as 10−10 M. This study investigates the feasibility of an SERS device that couples the sensing and pumping capabilities of diatom biosilica thin films by determining flow rate limitations and stability. In this paper, we quantify the ability of porous diatom biosilica thin films to continuously pump deionized (DI) water from a reservoir via wicking flow by utilizing the strong capillary forces of the porous film coupled with evaporation. Our microfluidic device is comprised of a narrow horizontal reservoir fixed to a horizontal capillary whose end contacts a diatom biosilica film. Flow rates were controlled by altering the size and/or temperature of the biosilica porous film, determined by tracking the liquid meniscus displacement in the reservoir, and correlated with a modified laminar boundary-layer model. System stability was observed by tracking flow rates over the course of a given experiment, image analysis of the meniscus contacting the film, and a flow duration study. We found that for untreated DI water bubbles begin to form in the capillary tube at temperatures above 40 °C, but degassed water remains stable at temperatures of 90 °C and below. The pumping capabilities of the films ranged from 0.11 to 10.46 µL/min, matched theoretical predictions, demonstrated stable flow trends, and maintained flow for over 48 h.

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Acknowledgements

We are grateful to the National Science Foundation (NSF) for funding our research through CBET awards 1701339 and 1701329.

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Authors and Affiliations

  1. School of Engineering and Computer Science, Washington State University-Vancouver, Vancouver, WA, 98686, USA

    Hunter Jarrett, Micah Wade & Hua Tan

  2. School of Chemical, Biological and Environmental Engineering, Oregon State University, Corvallis, OR, 97331, USA

    Joseph Kraai & Gregory L. Rorrer

  3. School of Electrical Engineering and Computer Science, Oregon State University, Corvallis, OR, 97331, USA

    Alan X. Wang

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  1. Hunter Jarrett
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  2. Micah Wade
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Correspondence to Hua Tan.

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Jarrett, H., Wade, M., Kraai, J. et al. Self-powered microfluidic pump using evaporation from diatom biosilica thin films. Microfluid Nanofluid 24, 36 (2020). https://doi.org/10.1007/s10404-020-02343-5

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