Electrowettingおよび界面振動を用いた鉛直平行電極上における微小液滴の輸送(流体工学,流体機械)

概要

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In this study, we demonstrate the small droplet transportation on vertical parallel electrodes using electrowetting and the interfacial oscillation. The transportation of water droplets, which can be applied to the droplet-based biochemical devices, is performed by applying ac voltage that ranges from 0 to 100V_<pp>, and from 20 to 100Hz. The characteristic of the transportation is observed by the use of a high speed camera, and the effects of the interfacial oscillation and the dynamical contact angle on the droplet motion are investigated in detail. The experimental results show that the vertical velocity of the droplet can be controlled by changing the amplitude and frequency of applied ac voltage. In addition, the dynamics of the droplet is estimated theoretically considering the interfacial tension force due to the dynamical contact angle and the gravitational force. The predicted force and displacement of the droplet agree well with the experimental values obtained from the high speed observation of the droplet motion.
社団法人日本機械学会の論文
2008-09-25