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Open AccessFeature PaperArticle

Size-Dependent and Property-Independent Passive Microdroplet Sorting by Droplet Transfer on Dot Rails

Faculty of Science and Engineering, Waseda University, 3-4-1, Okubo, Shinjuku-ku, Tokyo 169-8555, Japan
Research Organization for Nano & Life Innovation, Waseda University, 513, Tsurumaki-cho, Waseda, Shinjuku-ku, Tokyo 162-0041, Japan
Author to whom correspondence should be addressed.
Micromachines 2018, 9(10), 513;
Received: 15 September 2018 / Revised: 9 October 2018 / Accepted: 9 October 2018 / Published: 11 October 2018
(This article belongs to the Section A:Physics)
A fully passive microdroplet sorting method is presented in this paper. On the rails with dot patterns, the droplets were sorted in different ways depending on their size. However, the effect of droplet properties on the threshold size of the sorting was eliminated. The droplet positions on two railways and the Laplace pressure of the droplets on the dot patterns allowed selective droplet transfer according to size. Different gaps between the rails altered the threshold size of the transfer. However, the threshold size was independent of the droplet’s surface tension and viscosity because the droplet transfer utilized only the droplet position and Laplace pressure without lateral flow to sort targets. This feature has a high potential for bio/chemical applications requiring categorization of droplet targets consisting of various mixtures as pre- or post-elements. View Full-Text
Keywords: microdroplet; sorting; dot rail; transfer microdroplet; sorting; dot rail; transfer
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MDPI and ACS Style

Yoon, D.H.; Tanaka, D.; Sekiguchi, T.; Shoji, S. Size-Dependent and Property-Independent Passive Microdroplet Sorting by Droplet Transfer on Dot Rails. Micromachines 2018, 9, 513.

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