We propose a micro pipette which has a pumping and ejecting function based on the principle of electrowetting on dielectric (EWOD). The pipette was fabricated through a simple process of depositing and patterning conductive materials and hydrophobic polymer coatings on the inside and outside of a pulled glass tube. We estimated the amount of the controllable water theoretically. The pipette was designed to pump up liquid of 50 nl at a driving voltage of 250 V. Capillary rise and depression were then observed in a fabricated pipette.

References :
Kazunori Hoshino, Soroj Triteyaprasert, Kiyoshi Matsumoto, Isao Shimoyama, “Electrowetting Based Actuation for Microinjection,” The 12th International Conference on Solid-State Sensors, Actuators and Microsystems (Transducers '03), pp. 1800-1803, Boston, Massachusetts, USA, Jun. 8-12, 2003. [Proceedings]

Kazunori Hoshino, Soroj Triteyaprasart, Kiyoshi Matsumoto, Isao Shimoyama, “Electrowetting-Based Pico-Liter Liquid Actuation in a Glass-Tube Microinjector,” Sensors and Actuators A, vol. 114, pp. 473-477, 2004. [Paper]