Abstract
This paper reports on the extraction of solution from a PDMS microchannel using two forms of liquid actuation by electrical methods. Electro Wetting on Dielectric (EWOD) and Liquid Dielectrophoresis (LDEP). On the Liquid Dielectrophoresis (LDEP) device, upon application of an AC voltage on a pair of parallel electrodes beneath the PDMS microchannel, a liquid finger protrudes from the microchannel exit and advances along the gap between the electrodes. After the voltage is removed, the liquid finger breaks due to capillarity-driven instability and picolitre-sized droplets are formed at specific periodic bumps.
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