Volume difference in microdroplets in vertical contact control under electrowetting-induced asymmetric boundary condition
Volume difference in microdroplets in vertical contact control under electrowetting-induced asymmetric boundary condition
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DOI：
10.35848/1347-4065/acb51e
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发表时间：
2023-01-01
影响因子：
1.5
通讯作者：
Konishi, Satoshi
中科院分区：
文献类型：
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作者：
Bono, Shinji;Miyata, Yoshinori;Konishi, Satoshi
微滴的三维操纵对于生化科学应用很有吸引力。在垂直接触控制中，我们接触微滴和相对的液滴，以在微滴之间扩散化学物质。然后，我们将聚结液滴分离成两个微滴。然而，相对微滴的垂直接触控制会因重力而导致体积差异。我们将电润湿集成到润湿图案基板中以控制体积差异。当电压施加到电润湿基板时，介电相互作用会产生与重力相反方向的吸引力。我们定量研究了施加电压下垂直接触控制后的体积差异。因此，我们发现体积差随着电压的增加而单调减小。接下来，我们的力平衡理论（其中电润湿效应是不对称边界条件）与实验结果定量相关。
Three-dimensional manipulation of microdroplets is attractive for biochemical science applications. In vertical contact control, we contact a microdroplet and an opposite droplet to diffuse chemicals between microdroplets. Then, we separate coalescent droplets into two microdroplets. However, vertical contact control of opposite microdroplets results in a volume difference due to gravity. We integrate electrowetting into the wetting pattern substrates to control the volume difference. When voltage is applied to electrowetting substrates, dielectric interaction generates an attractive force in the opposite direction to gravity. We quantitatively investigated the volume difference after vertical contact control under applied voltage. Thus, we discovered that the volume difference monotonously decreases as the voltage increases. Next, our force balance theory, in which the effect of electrowetting is an asymmetric boundary condition, quantitatively correlates with experimental results.