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Droplet Transportation on a Wettability Gradient Surface Generated by Electrowetting-on-Dielectric

  • Imamura Keita
    Graduate School of Life Science and Systems Engineering, Kyushu Institute of Technology
  • Yasuda Takashi
    Graduate School of Life Science and Systems Engineering, Kyushu Institute of Technology

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Abstract

This paper presents a novel microdevice for droplet transportation using a wettability gradient surface that is generated by EWOD (Electrowetting-on-dielectric). Velocity of a droplet on this device can be controlled by changing the frequency of a square-wave voltage that is applied between two interdigitated and wedge-shaped electrodes. When a square wave voltage of 50 V and 10 Hz was applied, the transportation velocity of a 5 μl deionized (DI) water droplet was 3.9 mm/s. Also, we succeeded in transporting not only DI water but also organic solution (dimethyl sulphoxide, DMSO) and electrolyte solution (KCl and phosphate bufferd saline, PBS), and investigated the relationship between their transportation velocities and voltage frequencies.

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