Electrowetting of Ionic Liquids in Solid–Liquid–Liquid Systems - Drops and Bubbles in Contact with Solid Surfaces - page 252

Figure 7. Electrowetting curve (contact angle vs. RMS voltage) for Teflon
AF1600-bmim.BF 4 -Hexadecane obtained with AC voltage (square wave, 500 Hz). Five con-
secutive experiments were carried out on the same location on the Teflon-coated electrode. The
solid line is the best fit of the Young-Lippmann. The dotted line marks the saturation contact angle
obtained with DC voltage. Reprinted with permission from Paneru et al. [50]. Copyright 2010
American Chemical Society.
Figure 8. Static contact angle, θ , as a function of the applied DC voltage, V , for a droplet of ionic
liquid immersed in hexadecane on an electrode insulated with Teflon AF1600. The solid lines are
the best fit of the Young-Lippmann equation. Reprinted with permission from Paneru et al. [51].
Copyright 2011 VSP.
the PF 6 ionic liquids but markedly larger for the iodide and smaller for the NTf 2
anion. The saturation voltages are also very different.
The electrowetting curves obtained with DC voltage for various bmim.BF 4 -water
mixtures are shown in Fig. 10.
The curves are symmetric with respect to voltage polarity (only the positive
branches are shown) and follow the Young-Lippmann equation (solid lines) prior