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Shape Oscillation and Internal Mixing in Sessile Liquid Drops using ElectroWetting-On-Dielectric (EWOD)

R. Miraghaie, J.D. Sterling and A. Nadim
Keck Graduate Institute, US

Keywords:
droplet microfluidics, electrowetting, mixing

Abstract:
We show that internal mixing within a sessile liquid drop can be significantly enhanced by means of so-called electrowetting-on-dielectric (EWOD), using an alternating electric potential. This is done experimentally by comparing the coalescence and mixing of two dyed liquid drops that are brought together by electrowetting actuation. To understand the internal mixing, which appears to be driven by shape oscillations of the sessile drop, we also conduct detailed experimental and analytical studies of the shape oscillations of drops that are attached to a planar solid surface. We show that depending on the frequency of the applied alternating field, single or multiple modes of oscillation may be excited.

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