AC EWOD-induced asymmetric droplet oscillation and manipulation

Lee, Seungmin; Lee, Dae-Young; Choi, Minsuk; Chung, Sang Kug

doi:10.1016/j.sna.2022.113910

Cited by 8 publications

(4 citation statements)

References 40 publications

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“…At the micro/nanoscale, several methods have been used to generate and control bubbles for microoperation, including injection [25,26], electrowetting [27,28], and optothermal effects [29,30]. Bubbles injected by microtubules are difficult to control, and the bubbles on electrowetting electrodes lack flexibility.…”

Section: Introductionmentioning

confidence: 99%

Three-Dimensional Manipulation of Micromodules Using Twin Optothermally Actuated Bubble Robots

Dai,

Liu,

Zhou

et al. 2024

Micromachines

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A 3D manipulation technique based on two optothermally generated and actuated surface-bubble robots is proposed. A single laser beam can be divided into two parallel beams and used for the generation and motion control of twin bubbles. The movement and spacing control of the lasers and bubbles can be varied directly and rapidly. Both 2D and 3D operations of micromodules were carried out successfully using twin bubble robots. The cooperative manipulation of twin bubble robots is superior to that of a single robot in terms of stability, speed, and efficiency. The operational technique proposed in this study is expected to play an important role in tissue engineering, drug screening, and other fields.

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Section: Introductionmentioning

confidence: 99%

Three-Dimensional Manipulation of Micromodules Using Twin Optothermally Actuated Bubble Robots

Dai,

Liu,

Zhou

et al. 2024

Micromachines

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“…Concomitant with the progress in microfluidic technologies, droplet microfluidics realizes the flow control of microdroplets and builds a new platform for biological and medical research. Until now, a variety of droplet control methods such as electrowetting [13,14], optical tweezers [15,16], acoustic manipulation [17], and magnetic manipulation [18][19][20] have been developed to transport, sort, split, merge and mix droplets.…”

Section: Introductionmentioning

confidence: 99%

Recent Advances in Magnetically Actuated Droplet Manipulation for Biomedical Applications

Li,

Su,

Liu

et al. 2024

Magnetochemistry

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The manipulation of droplets plays a vital role in biomedicine, chemistry, and hydromechanics, especially in microfluidics. Magnetic droplet manipulation has emerged as a prominent and advanced technique in comparison to other modes such as dielectric infiltration, optical radiation, and surface acoustic waves. Its notable progress is attributed to several advantages, including excellent biocompatibility, remote and non-contact control, and instantaneous response. This review provides a comprehensive overview of recent developments in magnetic droplet manipulation and its applications within the biomedical field. Firstly, the discussion involves an examination of the distinctive features associated with droplet manipulation based on both permanent magnet and electromagnet principles, along with a thorough exploration of the influencing factors impacting magnetic droplet manipulation. Additionally, an in-depth review of magnetic actuation mechanisms and various droplet manipulation methods is presented. Furthermore, the article elucidates the biomedical applications of magnetic droplet manipulation, particularly its role in diagnostic assays, drug discovery, and cell culture. Finally, the highlights and challenges of magnetic droplet manipulation in biomedical applications are described in detail.

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“…Electrowetting is used in several applications, such as micro-drop generation, mixing and splitting [ 1 , 2 ], high-speed droplet actuation [ 3 , 4 ], chip cooling [ 5 ], drug release and clinical diagnosis [ 6 , 7 ], e-paper and electronic display [ 8 , 9 ], energy harvesting [ 10 ], solar indoor lighting [ 11 ], optics and beam steering [ 12 , 13 ]. In most electrowetting studies, the primary focus has been to observe the drop deformation and contact-angle change when the applied voltage is varied.…”

Section: Introductionmentioning

confidence: 99%

Influence of the Ground Electrode on the Dynamics of Electrowetting

2023

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The ability to manipulate a liquid meniscus using electrowetting has many applications. In any electrowetting design, at least two electrodes are required: one forms the field to change the contact angle and the other functions as a ground electrode. The contribution of the ground electrode (GE) to the dynamics of electrowetting has not yet been thoroughly investigated. In this paper, we discovered that with a bare ground electrode, the contact angle of a sessile drop increases instead of decreases when a direct current (DC) voltage varying from zero to the threshold voltage is applied. This phenomenon is opposite to what occurs when the GE is coated with a dielectric, where the contact-angle change follows the Lippmann–Young equation above the threshold voltage of electrowetting. However, this behaviour is not observed with either a dielectric-coated electrode using direct current (DC) or a bare ground electrode using alternating current (AC) voltage electrowetting. This study explains this phenomenon with finite element simulation and theory. From previous research work, the ground electrode configuration is inconsistent. In some studies, the ground electrode is exposed to water; in other studies, the ground electrode is covered with dielectric. This study identified that an exposed ground electrode is not required in electrowetting. Moreover, this research work suggests that for applications where precise control of the contact angle is paramount, a dielectric-coated ground electrode should be used since it prevents the increase in the contact angle when increasing the applied potential from zero to the threshold voltage. This study also identified that contact angle hysteresis is lower with a Cytop-coated ground electrode and DC voltage than with a bare ground electrode using AC or DC voltages.

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AC EWOD-induced asymmetric droplet oscillation and manipulation

Cited by 8 publications

References 40 publications

Three-Dimensional Manipulation of Micromodules Using Twin Optothermally Actuated Bubble Robots

Three-Dimensional Manipulation of Micromodules Using Twin Optothermally Actuated Bubble Robots

Recent Advances in Magnetically Actuated Droplet Manipulation for Biomedical Applications

Influence of the Ground Electrode on the Dynamics of Electrowetting

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