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- W2086883963 abstract "A droplet of an ionic liquid (1-butyl-3-methylimidazolium tetrafluoroborate, bmim.BF4) is immersed in an immiscible liquid (n-hexadecane) and electrowetted on a flat Teflon AF1600-coated ITO electrode. The static contact angle decreases significantly when voltage is applied between the droplet and the electrode: from 145° down to 50° (with DC voltage) and 15° (with AC voltage). The electrowetting curves (contact angle versus voltage) are similar to the ones obtained in other solid/liquid/vapor and solid/liquid/liquid systems: symmetric with respect to zero voltage and correctly described by Young-Lippmann equation below saturation. The reversibility is excellent and contact angle hysteresis is minimal (∼2°). The step size used in applying the DC voltage and the polarity of the voltage are unimportant. The saturation contact angle cannot be predicted with the simple zero-interfacial tension theory. Spreading (after applying a DC voltage) and retraction (after switching off the voltage) of the droplet is monitored. The base area of the droplet varies exponentially during wetting (exponential saturation) and dewetting (exponential decay). The characteristic time is 20 ms for spreading and 35 ms for retraction (such asymmetry is not observed with water−glycerol mixtures of a similar viscosity). The spreading kinetics (dynamic contact angle versus contact line speed) can be described by the hydrodynamic model (Voinov’s equation) for small contact angles and by the molecular-kinetic model (Blake’s equation) for large contact angles. The role of viscous and molecular dissipation follows the scheme outlined by Brochard-Wyart and de Gennes." @default.
- W2086883963 created "2016-06-24" @default.
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- W2086883963 date "2010-05-27" @default.
- W2086883963 modified "2023-09-28" @default.
- W2086883963 title "Static and Dynamic Electrowetting of an Ionic Liquid in a Solid/Liquid/Liquid System" @default.
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- W2086883963 doi "https://doi.org/10.1021/ja9106397" @default.
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