Modeling on Electrowetting-On-Dielectric (EWOD)

2017 ◽  
Author(s):  
Haolun Xu ◽  
Brian Hernan ◽  
Chung-Lung Chen
Keyword(s):  
Electrowetting On Dielectric

scholarly journals Electrode and electrolyte configurations for low frequency motion energy harvesting based on reverse electrowetting

2021 ◽  
Vol 11 (1) ◽  
Author(s):  
Pashupati R. Adhikari ◽  
Nishat T. Tasneem ◽  
Russell C. Reid ◽  
Ifana Mahbub
Keyword(s):  
Energy Harvesting ◽  
Bias Voltage ◽  
Energy Harvester ◽  
Superior Performance ◽  
Maximum Output ◽  
Electrowetting On Dielectric ◽  
External Bias ◽  
Motion Energy ◽  
Ac Current ◽  
Self Powered

AbstractIncreasing demand for self-powered wearable sensors has spurred an urgent need to develop energy harvesting systems that can reliably and sufficiently power these devices. Within the last decade, reverse electrowetting-on-dielectric (REWOD)-based mechanical motion energy harvesting has been developed, where an electrolyte is modulated (repeatedly squeezed) between two dissimilar electrodes under an externally applied mechanical force to generate an AC current. In this work, we explored various combinations of electrolyte concentrations, dielectrics, and dielectric thicknesses to generate maximum output power employing REWOD energy harvester. With the objective of implementing a fully self-powered wearable sensor, a “zero applied-bias-voltage” approach was adopted. Three different concentrations of sodium chloride aqueous solutions (NaCl-0.1 M, NaCl-0.5 M, and NaCl-1.0 M) were used as electrolytes. Likewise, electrodes were fabricated with three different dielectric thicknesses (100 nm, 150 nm, and 200 nm) of Al2O3 and SiO2 with an additional layer of CYTOP for surface hydrophobicity. The REWOD energy harvester and its electrode–electrolyte layers were modeled using lumped components that include a resistor, a capacitor, and a current source representing the harvester. Without using any external bias voltage, AC current generation with a power density of 53.3 nW/cm2 was demonstrated at an external excitation frequency of 3 Hz with an optimal external load. The experimental results were analytically verified using the derived theoretical model. Superior performance of the harvester in terms of the figure-of-merit comparing previously reported works is demonstrated. The novelty of this work lies in the combination of an analytical modeling method and experimental validation that together can be used to increase the REWOD harvested power extensively without requiring any external bias voltage.

Real-time manipulation fluid-solid interfacial friction and adhesion force by electrowetting on dielectric

2021 ◽  
pp. 106985
Author(s):  
Cheng Tang ◽  
Yafeng Zhang ◽  
Conghui Dong ◽  
Jiaxin Yu ◽  
Jianping Lai ◽  
...  
Keyword(s):  
Real Time ◽  
Adhesion Force ◽  
Interfacial Friction ◽  
Electrowetting On Dielectric ◽  
Time Manipulation

scholarly journals Specific binding and magnetic concentration of CD8+ T-lymphocytes on electrowetting-on-dielectric platform

2010 ◽  
Vol 4 (4) ◽  
pp. 044106 ◽  
Author(s):  
Gaurav J. Shah ◽  
Jeffrey L. Veale ◽  
Yael Korin ◽  
Elaine F. Reed ◽  
H. Albin Gritsch ◽  
...  
Keyword(s):  
T Lymphocytes ◽  
Specific Binding ◽  
Electrowetting On Dielectric ◽  
Cd8 T Lymphocytes ◽  
Magnetic Concentration

Reverse Electrowetting-on-Dielectric Energy Harvesting Integrated With Charge Amplifier and Rectifier for Self-Powered Motion Sensors

2020 ◽  
Author(s):  
Pashupati R. Adhikari ◽  
Nishat T. Tasneem ◽  
Dipon K. Biswas ◽  
Russell C. Reid ◽  
Ifana Mahbub
Keyword(s):  
Energy Harvester ◽  
Schottky Diodes ◽  
Boost Converter ◽  
Motion Sensor ◽  
Motion Sensors ◽  
Frequency Range ◽  
Charge Amplifier ◽  
Electrowetting On Dielectric ◽  
Dc Voltage ◽  
Self Powered

Abstract This paper presents a reverse electrowetting-on-dielectric (REWOD) energy harvester integrated with rectifier, boost converter, and charge amplifier that is, without bias voltage, capable of powering wearable sensors for monitoring human health in real-time. REWOD has been demonstrated to effectively generate electrical current at a low frequency range (< 3 Hz), which is the frequency range for various human activities such as walking, running, etc. However, the current generated from the REWOD without external bias source is insufficient to power such motion sensors. In this work, to eventually implement a fully self-powered motion sensor, we demonstrate a novel bias-free REWOD AC generation and then rectify, boost, and amplify the signal using commercial components. The unconditioned REWOD output of 95–240 mV AC is generated using a 50 μL droplet of 0.5M NaCl electrolyte and 2.5 mm of electrode displacement from an oscillation frequency range of 1–3 Hz. A seven-stage rectifier using Schottky diodes having a forward voltage drop of 135–240 mV and a forward current of 1 mA converts the generated AC signal to DC voltage. ∼3 V DC is measured at the boost converter output, proving the system could function as a self-powered motion sensor. Additionally, a linear relationship of output DC voltage with respect to frequency and displacement demonstrates the potential of this REWOD energy harvester to function as a self-powered wearable motion sensor.

A transparent electrowetting-on-dielectric device driven by triboelectric nanogenerator for extremely fast anti-fogging

Nano Energy ◽  
2021 ◽  
pp. 106697
Author(s):  
Jie Tan ◽  
Penghao Tian ◽  
Mingyang Sun ◽  
Hongchen Wang ◽  
Nuo Sun ◽  
...  
Keyword(s):  
Triboelectric Nanogenerator ◽  
Electrowetting On Dielectric

Electrowetting-on-dielectric chip with integrated screen-printed electrochemical sensor for rapid chemical analysis

2018 ◽  
Vol 238-239 ◽  
pp. 36-41 ◽  
Author(s):  
Kessararat Ugsornrat ◽  
Thitima Maturos ◽  
Patiya Pasakon ◽  
Chanpen Karuwan ◽  
Tawee Pogfay ◽  
...  
Keyword(s):  
Chemical Analysis ◽  
Electrochemical Sensor ◽  
Electrowetting On Dielectric ◽  
Screen Printed
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