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Soft electrowetting
arΧiv
Soft Matter
15
, 6469–6475 (
2019
)
Authors
Ranabir Dey
Mathijs van Gorcum
Frieder Mugele
Jacco Snoeijer
BibTeΧ
@Article{C9SM00847K, author ="Dey, Ranabir and van Gorcum, Mathijs and Mugele, Frieder and Snoeijer, Jacco H.", title ="Soft electrowetting", journal ="Soft Matter", year ="2019", volume ="15", issue ="32", pages ="6469-6475", publisher ="The Royal Society of Chemistry", doi ="10.1039/C9SM00847K", url ="http://dx.doi.org/10.1039/C9SM00847K", abstract ="Electrowetting is a commonly used tool to manipulate sessile drops on hydrophobic surfaces. By applying an external voltage over a liquid and a dielectric-coated surface{,} one achieves a reduction of the macroscopic contact angles for increasing voltage. The electrostatic forces all play out near the contact line{,} on a scale of the order of the thickness of the solid dielectric layer. Here we explore the case where the dielectric is a soft elastic layer{,} which deforms elastically under the effect of electrostatic and capillary forces. The wetting behaviour is quantified by measurements of the static and dynamic contact angles{,} complemented by confocal microscopy to reveal the elastic deformations. Even though the mechanics near the contact line is highly intricate{,} the macroscopic contact angles can be understood from global conservation laws in the spirit of Young–Lippmann. The key finding is that{,} while elasticity has no effect on the static electrowetting angle{,} the substrate{'}s viscoelasticity completely dictates the spreading dynamics of electrowetting."}
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