Abstract
Kinetics of water droplets on the surface of shielded metal electrodes is studied in the presence of external electric field. It is shown that the difference of contact angles of droplet fragments on the control electrodes plays the key role in motion. It is also shown that a droplet always moves toward the negative electrode regardless of the polarity of control electrodes and grounding for the dielectric system under study. The theoretical analysis of the results is based on the Lippmann equation written for a polarized droplet that is localized on control electrodes shielded with a multilayer insulator.
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Notes
Real capacitance of the Teflon capacitor Ci2 is greater than capacitances Ci1 and Ci3 by a factor of several hundreds.
An MII-4 microinterferometer is used to measure thicknesses of the dielectric layer. For the measurements, the optically transparent layers are coated with thin reflecting Al films using physical vapor deposition.
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Translated by A. Chikishev
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Orlov, A.M., Makhmud-Akhunov, M.Y. & Kuznetsova, K.V. Electric-Field-Controlled Motion of Liquid Droplets on the Surface of Dielectric Films. Tech. Phys. 63, 1576–1581 (2018). https://doi.org/10.1134/S106378421811021X
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DOI: https://doi.org/10.1134/S106378421811021X