Effect of Contact Angle Hysteresis on Electrowetting Threshold for Droplet Transport
Effect of Contact Angle Hysteresis on Electrowetting Threshold for Droplet Transport
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DOI：
10.1163/156856111x600136
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发表时间：
2012-01-01
影响因子：
2.3
通讯作者：
Pak, James Jungho
中科院分区：
文献类型：
--
作者：
Chang, Jong-hyeon;Pak, James Jungho
本文研究了三种不同的地面电润湿结构中，液滴与固体表面粘结引起的接触角滞后对液滴输运阈值电压的影响。从理论上分析了电润湿阈值下的接触角，发现在单板和双板结构中，阈值电压等于磁滞电压，而在双板结构中，阈值电压等于磁滞电压的2倍的平方根。用2.5µm厚的聚酰亚胺(epsilon(R)=3.3)作为介质层，以薄的Teflon AF为疏水层(theta(0)=116度，α=4-6度)制备的器件，单板、双板和双板器件的液滴传输起始阈值电压分别为28、40和28V，稳定液滴传输的阈值电压分别为35、50和35V。所有的结果都与理论值非常吻合。(C)Koninklijke Brill NV，莱顿，2011年
This paper describes the effect of the contact angle hysteresis caused by the adhesion between the liquid droplet and the solid surface on the threshold voltage for droplet transport in three different ground-type electrowetting configurations. It was found that the threshold voltage equals the hysteresis voltages in both single-plate and twin-plate configurations and the square root of 2 times the hysteresis voltage in the two-plate configuration by analyzing the contact angles at electrowetting threshold theoretically. The fabricated devices using 2.5 mu m thick polyimide (epsilon(r) = 3.3) as the dielectric layer and thin Teflon AF as the hydrophobic layer (theta(0) = 116 degrees and alpha = 4-6 degrees) showed the threshold voltages for droplet transport initiation of 28, 40 and 28 V in the single-plate, two-plate and twin-plate devices, respectively, and the threshold voltages for stable droplet transport of 35, 50 and 35 V, respectively. All the results are in very good agreement with theoretical values. (C) Koninklijke Brill NV, Leiden, 2011