Electric field induced deformation of hemispherical sessile droplets of ionic liquid

Tsakonas, Costas and Corson, Lindsey T. and Sage, Ian C. and Brown, Carl V. (2014) Electric field induced deformation of hemispherical sessile droplets of ionic liquid. Journal of Electrostatics, 72 (6). pp. 437-440.

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    Abstract

    Sessile droplets of an ionic liquid with contact angles close to 90° were subjected to an electric field E = V/w inside a capacitor with plate separation w and potential difference V. For small field induced deformations of the droplet shape the change in maximum droplet height, Δh = h(E) – h(0), was found to be virtually independent of the plate separation provided that w > 3h(0). In this regime a scaling law obtains Δh α E2r2, where r is the constant droplet radius, in agreement with the asymptotic predictions of Basaran and Scriven (J. Coll. Int. Sci. 140, 10, 1990).