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Title: Low Voltage Electrowetting on Ferroelectric PVDF-HFP Insulator with Highly Tunable Contact Angle Range
Authors: Sawane, Yogesh B.
Banpurkar, Arun G.
Dept. of Physics
Keywords: Low Voltage Electrowetting
Ferroelectric PVDF-HFP
Highly Tunable
Contact Angle Range
Bilayer dielectric
Contact angle saturation
Droplet mixing
Ferroelectric PVDF-HFP insulator
low voltage electrowetting
Issue Date: Sep-2016
Publisher: American Chemical Society
Citation: ACS Applied Materials and Interfaces, 8 (36), 24049-24056.
Abstract: We demonstrate a consistent electrowetting response on ferroelectric poly(vinylidene fluoride-co-hexafluoropropylene) (PVDF-HFP) insulator covered with a thin Teflon AF layer. This bilayer exhibits a factor of 3 enhancement in the contact angle modulation compared to that of conventional single-layered Teflon AF dielectric. On the basis of the proposed model the enhancement is attributed to the high value of effective dielectric constant (εeff ≈ 6) of the bilayer. Furthermore, the bilayer dielectric exhibits a hysteresis-free contact angle modulation over many AC voltage cycles. But the contact angle modulation for DC voltage shows a hysteresis because of the field-induced residual polarization in the ferroelectric layer. Finally, we show that a thin bilayer exhibits contact angle modulation of Δθ (U) ≈ 60° at merely 15 V amplitude of AC voltage indicating a potential dielectric for practical low voltage electrowetting applications. A proof of concept confirms electrowetting based rapid mixing of a fluorescent dye in aqueous glycerol solution for 15 V AC signal.
ISSN: 1944-8244
Appears in Collections:JOURNAL ARTICLES

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