Electrowetting of Ionic Liquids in Solid–Liquid–Liquid Systems - Drops and Bubbles in Contact with Solid Surfaces - page 241

Electrowetting of Ionic Liquids in
Solid-Liquid-Liquid Systems

Rossen Sedev , Craig Priest and John Ralston
Ian Wark Research Institute, ARC Special Research Centre for Particle and Material Interfaces,
University of South Australia, Mawson Lakes, SA 5095, Australia

Keywords
Electrowetting, ionic liquid, contact angle, spreading, wetting kinetics, energy dissipation

Contents
A. Introduction ............................................... 241

A.1. young-lippmann equation]Young-Lippmann Equation . . . ................. 242

A.2. Electrowetting Saturation . .................................... 244

A.3. Solid-Liquid-Liquid Electrowetting . .............................. 244

A.4. conductive liquids]Conductive Liquids ............................. 245

A.5. wetting dynamics]Wetting Dynamics .............................. 245

B. Materials and Methods ......................................... 247

B.1.Insulator .............................................. 247

B.2.IonicLiquids ........................................... 249

B.3.Electrode.............................................. 249

B.4. Electrowetting . .......................................... 249

C.Results.................................................. 250

D.Discussion................................................ 255

D.1. Electrowetting Performance ................................... 255

D.2. electrowetting saturation]Electrowetting Saturation ...................... 258

D.3. dynamics of electrowetting]Dynamics of Electrowetting . . . ................. 260

E.Conclusion ............................................... 263

F.Acknowledgements........................................... 263

G.References................................................ 264

A. Introduction
In electrowetting the contact angle is altered by applying an external voltage [1-
3]. In the most common configuration (Fig. 1a), experiments are carried out with an
electrically conductive droplet resting on a flat electrode insulated with a hydropho-
bic polymer layer. A parallel-plate capacitor is formed between the electrode and