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Open-channel microfluidics via resonant wireless power transfer

Author

Listed:
  • Christopher T. Ertsgaard

    (University of Minnesota)

  • Daehan Yoo

    (University of Minnesota)

  • Peter R. Christenson

    (University of Minnesota)

  • Daniel J. Klemme

    (University of Minnesota)

  • Sang-Hyun Oh

    (University of Minnesota)

Abstract

Open-channel microfluidics enables precise positioning and confinement of liquid volume to interface with tightly integrated optics, sensors, and circuit elements. Active actuation via electric fields can offer a reduced footprint compared to passive microfluidic ensembles and removes the burden of intricate mechanical assembly of enclosed systems. Typical systems actuate via manipulating surface wettability (i.e., electrowetting), which can render low-voltage but forfeits open-microchannel confinement. The dielectric polarization force is an alternative which can generate open liquid microchannels (sub-100 µm) but requires large operating voltages (50–200 VRMS) and low conductivity solutions. Here we show actuation of microchannels as narrow as 1 µm using voltages as low as 0.5 VRMS for both deionized water and physiological buffer. This was achieved using resonant, nanoscale focusing of radio frequency power and an electrode geometry designed to abate surface tension. We demonstrate practical fluidic applications including open mixing, lateral-flow protein labeling, filtration, and viral transport for infrared biosensing—known to suffer strong absorption losses from enclosed channel material and water. This tube-free system is coupled with resonant wireless power transfer to remove all obstructing hardware — ideal for high-numerical-aperture microscopy. Wireless, smartphone-driven fluidics is presented to fully showcase the practical application of this technology.

Suggested Citation

  • Christopher T. Ertsgaard & Daehan Yoo & Peter R. Christenson & Daniel J. Klemme & Sang-Hyun Oh, 2022. "Open-channel microfluidics via resonant wireless power transfer," Nature Communications, Nature, vol. 13(1), pages 1-9, December.
    • Handle: RePEc:nat:natcom:v:13:y:2022:i:1:d:10.1038_s41467-022-29405-2
    DOI: 10.1038/s41467-022-29405-2
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    References listed on IDEAS

    as
    1. Sang-Hyun Oh & Hatice Altug, 2018. "Performance metrics and enabling technologies for nanoplasmonic biosensors," Nature Communications, Nature, vol. 9(1), pages 1-5, December.
    2. Sang-Hyun Oh & Hatice Altug & Xiaojia Jin & Tony Low & Steven J. Koester & Aleksandar P. Ivanov & Joshua B. Edel & Phaedon Avouris & Michael S. Strano, 2021. "Nanophotonic biosensors harnessing van der Waals materials," Nature Communications, Nature, vol. 12(1), pages 1-18, December.
    3. Ronen Adato & Hatice Altug, 2013. "In-situ ultra-sensitive infrared absorption spectroscopy of biomolecule interactions in real time with plasmonic nanoantennas," Nature Communications, Nature, vol. 4(1), pages 1-10, October.
    4. Tom Krupenkin & J. Ashley Taylor, 2011. "Reverse electrowetting as a new approach to high-power energy harvesting," Nature Communications, Nature, vol. 2(1), pages 1-8, September.
    5. Robert A. Hayes & B. J. Feenstra, 2003. "Video-speed electronic paper based on electrowetting," Nature, Nature, vol. 425(6956), pages 383-385, September.
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