Journal ArticleDOI
Electrowetting behaviour of thermostable liquid over wide temperature range
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TLDR
In this article, the cosine of contact angle versus voltage square was analyzed to illustrate the self-consistent electrowetting response in the temperatures ranging from − 40 to 70°C.Abstract:
Outdoor electrowetting (EW)-based applications need consistent wetting response in the temperatures ranging from − 40 to 70 °C. Aqueous ethylene glycol is commonly used as thermostable liquid; nevertheless, its EW behaviour over a wide range of temperature is less known. We examine this behaviour for both ac and dc voltages over the temperature range from − 25 to 65 °C. The self-consistent EW responses, i.e. cosine of contact angle versus voltage square, are analysed to illustrate the EW behaviour. There is a systematic increase in EW response with temperature confirmed from the linear dependence of interfacial tension on temperature. Our result corroborates Eotvos phenomenological relation. We suggest the need of correction voltage with changing temperature to maintain uniform EW response over this temperature range. Further with decreasing temperature, the solution viscosity increases more rapidly than the increase in interfacial tension value, and thus the capillary number $$ (Ca = \mu v/\gamma ) $$ gets partially regulated. This is seen as a marginal variation in the switching time of the EW contact angle during the OFF voltage state to ON state and vice versa. Finally, the working of a prototype liquid lens at − 25 °C, the lowest operating temperature, is demonstrated.read more
Citations
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Journal ArticleDOI
Reactive flash sintering (RFS) in oxide systems: kinetics and thermodynamics
TL;DR: The literature of reactive flash sintering (RFS) in multi-component oxide systems nowadays consists of different types of binary phase diagrams, which were used in this article for analysis.
Journal ArticleDOI
Non-aqueous organic solution based large-aperture spherical electrowetting liquid lens with wide tunable focal length range
TL;DR: In this article , a liquid lens is filled with two immiscible liquids based on electrowetting on dielectric, and the chamber structure is cylindrical or conical.
Journal ArticleDOI
Temperature Dependence of Water Contact Angle on Teflon AF1600
TL;DR: A reproducible process is described to produce smooth and homogeneous Teflon AF1600 thin films, minimizing the influence of roughness and local heterogeneity on the CA.
Journal ArticleDOI
Large tuning in the electrowetting behaviour on ferroelectric PVDF-HFP/Teflon AF bilayer
TL;DR: In this article, a bilayer dielectric made up of ferroelectric PVDF-HFP with a thin layer of fluoropolymer was evaluated for ac-voltage EW in silicone oil for ambient temperature ranging from − 25 to 70°C.
Journal ArticleDOI
Temperature-dependent electrowetting behavior on Teflon AF1600
TL;DR: In this paper , the quasi-static electrowetting (EW) response on Teflon AF1600, in a temperature range from 25 to 70, was investigated, and the contact angle versus voltage was analyzed to illustrate the EW behavior.
References
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Journal ArticleDOI
Electrowetting: from basics to applications
TL;DR: In this paper, the authors compare the various approaches used to derive the basic electrowetting equation, which has been shown to be very reliable as long as the applied voltage is not too high.
Journal ArticleDOI
Variable focal lens controlled by an external voltage: An application of electrowetting
Bruno Berge,J. Peseux +1 more
TL;DR: Berge and Peseux as discussed by the authors used electrocapillarity in order to change the contact angle of a transparent drop, thus realizing a lens of variable focal length, with a typical response time of 0.03 s and a dissipated power of a few mW.
Journal ArticleDOI
Electrofluidic displays using Young-Laplace transposition of brilliant pigment dispersions
Jason Heikenfeld,Kaichang Zhou,Eric Kreit,Balaji Raj,Shu Yang,Bo Sun,April Milarcik,Lisa Clapp,Russell J. Schwartz +8 more
TL;DR: In this article, an ambient light display based on electrofluidic control of coloured pigment fluids is reported, which provides a direct view of brilliantly coloured pigment dispersions, with a white light reflectivity of 55%.
Journal ArticleDOI
An electromechanical interpretation of electrowetting
TL;DR: In this article, a nonlinear mechanism manifesting a voltage threshold is responsible for both contact angle saturation and the observed clamping of the electromechanical force on liquid volumes on a substrate.
Journal ArticleDOI
Electrowetting-Based Variable-Focus Lens for Miniature Systems
TL;DR: In this article, a self-centred variable-focus lens between two immiscible liquids of different refractive indices was used as a lens for mobile applications, and the lens was applied in a Blu-ray Disc optical recording system to enable dual layer disc reading/writing.