Journal ArticleDOI
Increased droplet coalescence using electrowetting on dielectric (EWOD)
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TLDR
In this paper, small-scale electrodes and gaps subjected to repeated short bursts of AC voltage were used to improve droplet coalescence and growth for water harvesting by actively bashing smaller droplets together to form larger ones.Abstract:
Small-scale electrodes and gaps subjected to repeated short bursts of AC voltage were used to improve droplet coalescence and growth for water harvesting by actively bashing smaller droplets together to form larger ones. Several different electrode patterns were tested under the same conditions. The results indicate that condensation on a cooled flat surface was increased using electrowetting (EW) by accelerating the slow coalescence process where smaller droplets join to form larger droplets and leave behind a dry surface for new droplets to form. A pattern consisting of 100-μm wide interdigitated electrodes separated by 100-μm gaps showed the fastest growth in droplet size. The largest droplets formed with such a pattern had approximately 30 times larger volume than the largest droplets formed on the surface when electrowetting was not applied. Finer patterns exhibited a larger overall condensation rate, where the electrowetting method showed up to a 56% increase in overall water condensation.read more
Citations
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Journal ArticleDOI
Triboelectric wetting for continuous droplet transport
Wanghuai Xu,Yuankai Jin,Wanbo Li,Yuxin Song,Shouwei Gao,Baoping Zhang,Lili Wang,Miao Miao Cui,Xiantong Yan,Zuankai Wang +9 more
TL;DR: In this article , the authors developed a largely unexplored triboelectric wetting (TEW) phenomenon that can directly exploit the tribolectric charges to achieve the programmed and precise water droplet control.
Journal ArticleDOI
Statistical modeling of electrowetting-induced droplet coalescence for condensation applications
TL;DR: In this article, the influence of the applied voltage, frequency of the AC waveform and the geometry of the electrowetting (EW) device on two parameters related to droplet coalescence was quantified.
Journal ArticleDOI
AC electrowetting promoted droplet shedding on hydrophobic surfaces
TL;DR: In this paper, the influence of AC electrowetting fields on short-duration droplet shedding on hydrophobic surfaces was studied, with three parameters being varied (voltage, AC frequency, and device geometry).
Journal ArticleDOI
Electrowetting-on-dielectric (EWOD): Current perspectives and applications in ensuring food safety
Snigdha Roy Barman,Imran Khan,Subhodeep Chatterjee,Subhajit Saha,Dukhyun Choi,Sangmin Lee,Zong-Hong Lin,Zong-Hong Lin +7 more
TL;DR: The advances and developments in the design of EWOD systems for performing versatile functions starting from sample preparation to sample detection, enabling rapid and high-throughput food analysis is reviewed.
Journal ArticleDOI
Nano-particles in optimal concentration facilitate electrically driven dynamic spreading of a drop on a soft viscoelastic solid
TL;DR: In this paper, the authors present a scaling theory that unveils the effect of nano-suspension on the dynamic spreading of a drop on a deformable substrate, and propose to use nano-fluid suspensions of optimal volume fraction to alter the final equilibrium contact angle.
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
Video-speed electronic paper based on electrowetting
TL;DR: It is shown that electrowetting can also be used to form the basis of a reflective display that is significantly faster than electrophoretic displays, so that video content can be displayed.
Journal ArticleDOI
Droplet Actuation by Electrowetting-on-Dielectric (EWOD): A Review
TL;DR: In this paper, a review of the electrowetting-on-dielectric (EWOD) actuation mechanism is presented, which summarizes the observations, insights, and modeling techniques that have led to the current picture showing how forces act on liquid droplets and how droplets respond in EWOD microfluidic devices.
Journal ArticleDOI
Electrowetting on paper for electronic paper display.
Duk Young Kim,Andrew J. Steckl +1 more
TL;DR: It is demonstrated that electrowetting devices can be readily fabricated on paper substrates and the promise of low-cost paper-based EW devices for video rate flexible e-paper on paper is indicated.
Journal ArticleDOI
Low voltage electrowetting using thin fluoroploymer films
TL;DR: Measurements indicate that the electrowetting equation is valid down to a 6 nm thick aFP film on a 11 nm thick SiO2, and contact angle saturation is independent of the electric field, and is reached when the surface energy of the solid-water interface approaches zero.