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Vibration Induced Transport of Enclosed Droplets

1
Department of Bioengineering, University of Washington, Seattle, WA 98105, USA
2
Department of Electrical & Computer Engineering and Institute for Nano-engineered Systems (NanoES), University of Washington, Seattle, WA 98105, USA
*
Author to whom correspondence should be addressed.
Micromachines 2019, 10(1), 69; https://doi.org/10.3390/mi10010069
Received: 7 December 2018 / Revised: 13 January 2019 / Accepted: 16 January 2019 / Published: 19 January 2019
(This article belongs to the Special Issue Microscale Surface Tension and Its Applications)
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Abstract

The droplet response to vibrations has been well characterized on open substrates, but microfluidic applications for droplets on open systems are limited by rapid evaporation rates and prone to environmental contamination. However, the response of enclosed droplets to vibration is less understood. Here, we investigate the effects of a dual-plate enclosure on droplet transport for the anisotropic ratchet conveyor system. This system uses an asymmetric pattern of hydrophilic rungs to transport droplets with an applied vibration. Through this work, we discovered that the addition of a substrate on top of the droplet, held in place with a 3D printed fixture, extends the functional frequency range for droplet transport and normalizes the device performance for droplets of different volumes. Furthermore, we found that the edge movements are anti-phasic between top and bottom substrates, providing a velocity profile that is correlated to vibration frequency, unlike the resonance-dependent profiles observed on open systems. These results expand the capabilities of this system, providing avenues for new applications and innovation, but also new insights for droplet mechanics in response to applied vibration. View Full-Text
Keywords: droplet; vibrations; transport; microfluidics droplet; vibrations; transport; microfluidics
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Holmes, H.R.; Böhringer, K.F. Vibration Induced Transport of Enclosed Droplets. Micromachines 2019, 10, 69.

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