REWoD-based vibrational energy harvesting exploiting saline-solutions loaded PAAm hydrogels on micro-structured aluminium oxides electrodes

Carraro, Giovanni; Passaglia, Simone; Paolini, G.; Bracco, G.; Savio, Letizia; Luciano, Giorgio; Vattuone, L.; Masini, R.; Smerieri, Marco

doi:10.1016/j.apsusc.2022.155522

Cited by 3 publications

(2 citation statements)

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“…The droplet contact angle is also affected by voltage polarity, and there is an asymmetric electrowetting phenomenon [20][21][22] with respect to the axis V = 0. Based on the EWOD principle, a lot of applications have been developed, including chip laboratory equipment [5][6][7][8][9], optical lenses [10,11], displays [12,13], and energy-harvesting systems [14][15][16]. In order to actuate droplets more efficiently, rapidly, and accurately, it is important and necessary to explore the relationships between the contact angle and the applied voltage.…”

Section: Introductionmentioning

confidence: 99%

“…Based on the EWOD principle, a lot of applications have been developed, including chip laboratory equipment [ 5 , 6 , 7 , 8 , 9 ], optical lenses [ 10 , 11 ], displays [ 12 , 13 ], and energy-harvesting systems [ 14 , 15 , 16 ]. In order to actuate droplets more efficiently, rapidly, and accurately, it is important and necessary to explore the relationships between the contact angle and the applied voltage.…”

Section: Introductionmentioning

confidence: 99%

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Research on the Asymmetric Phenomenon of Voltage Polarity Based on Dielectric Wetting

Ye,

Jin,

Zhao

et al. 2024

Materials

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The present research investigated the voltage polarity asymmetry phenomenon based on dielectric wetting. In an ITO–hydrophobic layer–droplet setup, three reagents with different pH values (3.96, 7.0, and 10.18), two types of hydrophobic materials (AF1601 and 6%T6), and two different thicknesses (340 nm and 2.5 μm) of each material were systematically investigated. The results show that the thickness of the hydrophobic dielectric layer and the pH of the droplets had a significant impact on the droplet contact angle variation with the voltage. The contact angle on the thick hydrophobic dielectric layer followed the Lippmann–Young equation as the voltage changed. The angle of the thin hydrophobic dielectric layer was affected by its own properties and the type of droplet, which led to the occurrence of voltage polarity asymmetry of the electrowetting phenomenon. After further investigation of this phenomenon, it was found that it mainly accounted for the decrease in electric field strength at both ends of the droplet, which was caused by electrochemical reactions and changes in circuit resistance. The leakage current is an important indicator, and this phenomenon can be prevented by increasing the thickness of the hydrophobic dielectric layer.

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