Design of crescent driving electrodes for digital electrowetting-on-dielectric devices

Xiao-wei, 许晓威 Xu; guo, 陈立国 Chen Li; Wen-yuan, 贺文元 He; Tao, 陈涛 Chen; ning, 孙立宁 Sun Li

doi:10.3788/ope.20142203.0633

Cited by 1 publication

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“…Obviously, LB4 always keep the shortest one and a smaller diameter of crescent electrode even can shorten LB. But on the other hand, as in Fig.3, LB is limited by the diameter of droplet due to the onset TCL needed which has discussed in [21]. If we need a same force (FEWOD1= FEWOD2= FEWOD3= FEWOD4) to keep the same R2 the fourth shape always cost the shortest L. It also means the opposite layout of crescent electrode shape can keep the smallest value of R2 which benefit the splitting of droplet.…”

Section: Theoretical Basismentioning

confidence: 88%

A novel crescent electrode for droplet splitting in digital microfluidic

Bian

Chen

2015

2015 IEEE 10th Conference on Industrial Electronics and Applications (ICIEA)

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Comparing to other operations, the splitting of droplet always need a higher voltage. The ways of reducing voltage has investigated. In this paper, a study is presented to investigate the best electrode shape of splitting droplet. A comparison about the droplet's fissility of different electrode shapes has been investigated in the experiments. A new electrode shape is proposed which provides a pair of larger force in opposite directions at the contact line as well as overlap between the adjacent electrodes. Based on the three-phase contact line(TCL)theory, the onset of actuation and droplet mobility on electrode arrays have been investigated. The superior performance of the opposite layout crescent electrode during splitting droplet is showed. Validation experiments were carried out to characterize the droplet actuation by various electrode shapes. About twenty percent of driving voltage can be saved compared to the other electrode. A similar result is showed by investigating the performance of the opposite layout crescent electrode at different kinds of channel heights.

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Section: Theoretical Basismentioning

confidence: 88%