O/Wエマルションに含まれる油滴の電界による挙動制御

抄録

In this paper, control of the motion of oil droplets in an O/W (Oil-in-Water) emulsion by electric field is attempted. To move the oil droplets by electric field, the surface of oil droplets was negatively charged by anionic surfactant (sodium dodecyl sulfate). The emulsion with these oil droplets flows in an acrylic channel. Electric field (3V) was applied from electrodes placed on both side of the channel. Accordingly, the oil droplets were attracted to the anode side by the electric field and flowed in the channel. As a result, the droplets flow in the region close to the anode. Anode direction velocity of oil droplet is measured by PTV. The channel bifurcates at downstream of the electrodes. These oil droplets flowed evenly through the branch when no electric field was applied from electrodes. Number of oil droplets guided through one side (anode side) of the branch were increased when electric field was applied from electrodes. On the other hand, it decreased when Reynolds number (flow velocity) increased. Anode direction velocity was independent of the Reynolds number.