Electrowetting on dielectric (EWOD) of sessile microdroplets containing gold nanoparticles

Patacsil, Crismar; Enriquez, Erwin P.; Guerrero, Raphael A.

doi:10.1016/j.matpr.2018.01.034

Cited by 6 publications

(4 citation statements)

References 11 publications

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“…40°for gold nanofluids in air using DC voltage. 22 By employing a biphasic system and an AC voltage, we are able to increase Δθ sat to 101.9 ± 1.5°for QD-G-COOH, an over 2.5 times improvement.…”

Section: Acs Applied Materials and Interfacesmentioning

confidence: 88%

“…Despite the multitude of applications of nanofluids, there are surprisingly few literature reports that investigate the electrowetting behavior and digital microfluidic applications of nanofluids. These reports mostly focus on deviations in ideal wetting behavior upon the addition of nanoparticles and can be divided into three basic material classes: polymer-based, − metallic, − and semiconductor − nanoparticles. Recent work has also demonstrated that nanofluids can be used to enhance the EWOD behavior of droplets on a soft poly(dimethylsiloxane) surface .…”

Section: Introductionmentioning

confidence: 99%

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Electrowetting Behavior and Digital Microfluidic Applications of Fluorescent, Polymer-Encapsulated Quantum Dot Nanofluids

Tohgha

Alvino

Jarnagin

et al. 2019

ACS Appl. Mater. Interfaces

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Digital microfluidics is a liquid-handling technology capable of rapidly and autonomously controlling multiple discrete droplets across an array of electrodes and has seen continual growth in the fields of chemistry, biology, and optics. This technology is enabled by rapidly switching the wettability of a surface through the application of an electric field: a phenomenon known as electrowetting-on-dielectric. The results reported here elucidate the wetting behavior of fluorescent quantum dot nanofluids by varying the aqueous-solubilizing polymers, changing the size of the nanocrystals, and the addition of surfactants. Nanofluid droplets were demonstrated to have very large changes in contact angle (>100°) by employing alternating current voltage to aqueous droplets within a dodecane medium. The stability of quantum dot nanofluids is also evaluated within a digital microfluidics platform, and the optical properties are not perturbed even under high voltages (250 V). Multiple fluorescent droplets with varying emission can be simultaneously actuated and rapidly mixed (<10 s) to generate a new nanofluid with optical properties different from the parent solutions.

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Section: Acs Applied Materials and Interfacesmentioning

confidence: 88%

Section: Introductionmentioning

confidence: 99%

Electrowetting Behavior and Digital Microfluidic Applications of Fluorescent, Polymer-Encapsulated Quantum Dot Nanofluids

Tohgha

Alvino

Jarnagin

et al. 2019

ACS Appl. Mater. Interfaces

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show abstract

“…Firstly, at the voltage of 2 kV, the change of contact angle of 0.1 wt% SiO 2 -water nanofluid and DI-water are more obvious under the electric field than the condition without an electric field. According to equation (1) and the research of Patacsil et al [25], the contact angle of nanofluids droplet was decreased with the increase of voltage. In addition, from the research of Vafaei et al [30], the number of nanoparticles at liquid-gas interface was increased with the increase of voltage in the experiments.…”

Section: Effect Of Electric Field Duration On Nanofluid Contact Anglementioning

confidence: 93%

“…When the voltage varied from 0 to ±40 V, the contact angle of the droplet would be gradually increased. Patacsil et al [25] studied the contact angle of gold nanofluid with different concentrations and found that the contact angle nanofluid was increased with the increase of voltage. The difference among different concentrations of nanofluids was that the reduction of contact angle was increased with the increase of nanofluid concentration under the same electric field.…”

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confidence: 99%

Experimental study and predicted model analysis of nanofluid wetting behavior under high voltage

Chen¹,

Wang²,

Zhang³

et al. 2021

Nanotechnology

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To explore the wetting behavior of nanofluid under high voltage, a contact angle measurement system under electric field is designed and set up. The effects of mass concentration, the type of nanoparticles and the temperature of dielectric layer are considered. The experimental results manifest that the contact angle reduction rate of SiO 2 -water nanofluid is gradually increased with the increase of nanofluid concentrations from 0 to 0.05 wt%. While, it is decreased when the concentration is varied from 0.05 to 0.25 wt%. On the other hand, the contact angle reduction rate of Al 2 O 3 -water nanofluid is generally greater than SiO 2 -water nanofluid with the same volume concentration. In addition, the reduction rate of the contact angle of the SiO 2 -water nanofluid would be gradually increased with the increase of the surface temperature of the dielectric layer. Moreover, the experimental values are greatly deviated from the results calculated by Young-Lippmann equation and its modified form of nanofluid. Hence, the present study proposes a dimensionless surface tension correct factor to obtain the modified equation which is based on the Young-Lippmann equation. The influence of electric charge, electric field force, drag force and Brownian force on nanoparticles under high voltage are considered in the modified equation. The results show that the modified equation can predict the trend of the nanofluid contact angle under higher voltage.

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The accurate control of the La2O3 hierarchical structure of the flower-like microspheres accompanied with vertical-standing nanopetals and the electrowetting responses with low voltage actuation

Wang

Zhang

Liu

et al. 2020

Ceramics International

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Electrowetting on dielectric (EWOD) of sessile microdroplets containing gold nanoparticles

Cited by 6 publications

References 11 publications

Electrowetting Behavior and Digital Microfluidic Applications of Fluorescent, Polymer-Encapsulated Quantum Dot Nanofluids

Electrowetting Behavior and Digital Microfluidic Applications of Fluorescent, Polymer-Encapsulated Quantum Dot Nanofluids

Experimental study and predicted model analysis of nanofluid wetting behavior under high voltage

The accurate control of the La2O3 hierarchical structure of the flower-like microspheres accompanied with vertical-standing nanopetals and the electrowetting responses with low voltage actuation

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