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Micromachines 2017, 8(12), 363; doi:10.3390/mi8120363

Enabling Droplet Functionality on Anisotropic Ratchet Conveyors

Department of Bioengineering, University of Washington, Seattle, WA 98105, USA
Department of Electrical Engineering, University of Washington, Seattle, WA 98195, USA
Author to whom correspondence should be addressed.
Received: 27 November 2017 / Revised: 11 December 2017 / Accepted: 14 December 2017 / Published: 16 December 2017
(This article belongs to the Special Issue Microscale Surface Tension and Its Applications)
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Anisotropic ratchet conveyors (ARCs) are a recently developed microfluidic platform that transports liquid droplets through a passive, microfabricated surface pattern and applied orthogonal vibrations. In this work, three new functionalities are presented for controlling droplet transport on the ARC system. These devices can pause droplet transport (ARC gate), decide between two pathways of droplet transport (ARC switch), and pass droplets between transport tracks (ARC delivery junction). All devices function solely through the modification of pinning forces acting on the transported droplet and are the first reported devices that can selectively control droplet timing and directionality without active (e.g., thermal, electrical, or magnetic) surface components. View Full-Text
Keywords: droplet transport; microfluidics; vibrations; contact line oscillation; asymmetric surfaces; anisotropic ratchet conveyor droplet transport; microfluidics; vibrations; contact line oscillation; asymmetric surfaces; anisotropic ratchet conveyor

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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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Holmes, H.R.; Gomez, A.E.; Böhringer, K.F. Enabling Droplet Functionality on Anisotropic Ratchet Conveyors. Micromachines 2017, 8, 363.

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