Partially filled electrodes for digital microfluidic devices

Pyne, Derek; Salman, W; Abdelgawad, Mohamed; Sun, Yu

doi:10.1063/1.4813260

Cited by 12 publications

(9 citation statements)

References 14 publications

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“…Electrodynamic forces are stronger and most dense on the front of the droplet near the TCL on the actuated electrode due to high electric field intensity ( Fig. 2a) [8,11,12,14,15]. The horizontal…”

Section: Simulation Of Force In Jigsaw Electrodementioning

confidence: 99%

“…Rajabi and Dolatabadi proposed a crescentshaped electrode design for droplet transport, but the asymmetric shape does not allow motion in both the forward and backward directions [11]. Similarly, for applying supply voltage to reference and actuated electrodes, several configurations have been demonstrated [8,[10][11][12][13][14][15][16]. However, the above-mentioned works do not address the problem of actuating inner electrodes in a large 2D array.…”

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confidence: 99%

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Jigsaw electrode design for electrowetting devices

Sohail¹,

Jaffery²,

Biswas³

2019

Micro & Nano Letters

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A new type of electrode design (jigsaw in shape) is presented for actuating inner electrodes in electrowetting-on-dielectric devices containing large two-dimensional array of electrodes. Electrodes are diagonally connected with one external pin to the voltage supply. Each electrode-pad is made by carving (or cutting) out two triangular sections from the sides and adding two triangular sections on the top and bottom of the traditional square electrode. This modification in electrode shape creates an imbalance of electromechanical force at the three-phase contact line on applying the supply voltage to the actuating electrode. Droplet moves towards either horizontal or vertical directions depending on the direction of the dominant force. The scheme requires a single layer of metal thin film deposition for device fabrication and also reduces the number of external pin connections to the power supply.

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Section: Simulation Of Force In Jigsaw Electrodementioning

confidence: 99%

mentioning

confidence: 99%

Jigsaw electrode design for electrowetting devices

Sohail¹,

Jaffery²,

Biswas³

2019

Micro & Nano Letters

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“…When performing the numerical simulation, the droplet can be approximated as a dielectric. 19,21,22 According to the law of conservation of charge and Laplace's equation …”

Section: The Design Of the Drive Electrode Prototype And Numericamentioning

confidence: 99%

Electrowetting on dielectric device with crescent electrodes for reliable and low-voltage droplet manipulation

Sun

Chen

et al. 2014

Biomicrofluidics

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Digital microfluidics based on electrowetting on dielectric is an emerging popular technology that manipulates single droplets at the microliter or even the nanoliter level. It has the unique advantages of rapid response, low reagent consumption, and high integration and is mainly applied in the field of biochemical analysis. However, currently, this technology still has a few problems, such as high control voltage, low droplet velocity, and continuity in flow, limiting its application. In this paper, through theoretical analysis and numerical simulation, it is deduced that a drive electrode with a crescent configuration can reduce the driving voltage. The experimental results not only validate this deduction but also indicate that crescent electrode can improve the droplet motion continuity and the success in split rate.

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“…Meanwhile, the droplet velocity varies with its positions on the EWOD following a function determined by the adjacent electrodes connecting configure. This factor is critical in the EWOD device design, and many works have considered it carefully [24][25][26]. Figure 6.…”

Section: Dielectric Thickness T Permittivity ε and Contact Line Lmentioning

confidence: 99%

Dynamics of Electrowetting Droplet Motion in Digital Microfluidics Systems: From Dynamic Saturation to Device Physics

et al. 2015

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A quantitative description of the dynamics of droplet motion has been a long-standing concern in electrowetting research. Although many static and dynamic models focusing on droplet motion induced by electrowetting-on-dielectric (EWOD) already exist, some dynamic features do not fit these models well, especially the dynamic saturation phenomenon. In this paper, a dynamic saturation model of droplet motion on the single-plate EWOD device is presented. The phenomenon that droplet velocity is limited by a dynamic saturation effect is precisely predicted. Based on this model, the relationship between droplet motion and device physics is extensively discussed. The static saturation phenomenon is treated with a double-layer capacitance electric model, and it is demonstrated as one critical factor determining the dynamics of droplet motion. This work presents the relationship between dynamics of electrowetting induced droplet motion and device physics including device structure, surface material and interface electronics, which helps to better understand electrowetting induced droplet motions and physics of digital microfluidics systems.

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Partially filled electrodes for digital microfluidic devices

Cited by 12 publications

References 14 publications

Jigsaw electrode design for electrowetting devices

Jigsaw electrode design for electrowetting devices

Electrowetting on dielectric device with crescent electrodes for reliable and low-voltage droplet manipulation

Dynamics of Electrowetting Droplet Motion in Digital Microfluidics Systems: From Dynamic Saturation to Device Physics

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