粘性流体中における液体輸送と微小液滴の形成

概要

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The dielectrophoretic (DEP) force acting on a liquid provides a controllable means for rapid movement and dispensing of small liquid volumes on a substrate. DEP microactuation of liquids requires strong non-uniform rf electric fields created by co-planar electrodes. Microliter volume of water deposited on an insulating layer that covers the coplanar electrodes are transported and subdivided into droplets as small as 1〜5 nl by sequences of voltage on and off. Experiments are conduced using substrates having the electrodes immersed in transformer oil. Observation of movement of water and droplet formation is made in various field conditions. The minimum voltage for DEP actuation of water in oil is 65-70% of that in the dry condition, and nanoliter droplets are formed. Evaporation of transporting liquid and formed droplets are also avoided. A two-dimensional model of the liquid protrusion motion is developed, taking into the viscous drag exerted by the viscous medium. Then experiments are conducted using silicone oil with various viscosities as the medium, and the position of the protrusion front is measured as a function of time. Good agreements between the experimental and the calculated value are observed.
鳥羽商船高等専門学校の論文
2006-02-28