Optoelectrowetting (OEW) with push-actuation of microdroplets at small frequencies and OEW equations revisited
Optoelectrowetting (OEW) with push-actuation of microdroplets at small frequencies and OEW equations revisited
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DOI：
10.1016/j.sna.2021.113331
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发表时间：
2022-02-01
影响因子：
4.6
通讯作者：
Fouckhardt, Henning
中科院分区：
文献类型：
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作者：
Strassner, Johannes;Doering, Christoph;Fouckhardt, Henning
同时，电介质上电润湿（EWOD）和光电润湿（OEW）是众所周知的现象和技术，例如，用于驱动数字微流体中的微滴（DMF =芯片实验室2.0）。OEW的优点在于电极不必被结构化，这使得装置的设计和技术更简单。但是OEW需要多一层，并且比纯EWOD更难找到最佳工作点。早在2008年，Krogmann等人就指出，取决于确切的参数，OEW可以被利用来拉或推液滴。到目前为止，对于典型的参数设置，已经理解到应当在所施加电压的小频率下观察到牵拉致动，而应当在近似1 kHz或更高的较大频率下测量推动致动。在实验室中的一些设备，我们发现推致动的一个非常小的频率为50赫兹，因此-在这个主要是数值研究-重新审视和修改的方程通常用于描述OEW。(c)2021年，任作者。出版社：Elsevier B. V. CC_BY_4.0
Meanwhile, electrowetting on dielectric (EWOD) and optoelectrowetting (OEW) are well-known phenomena and techniques, e.g., used to actuate microdroplets in digital microfluidics (DMF = lab on a chip 2.0). OEW has the advantage that the electrodes do not have to be structured, which makes design and technology of the device simpler. But one more layer is necessary for OEW and it is harder than with pure EWOD to find the best operating point. As early as 2008 Krogmann et al. pointed out that depending on exact parameters OEW can be exploited either to pull or to push droplets. Until now the understanding has been that pull-actuation should be observed at small frequencies of the applied voltage, while push -actuation should be measured at larger frequencies of approximate to 1 kHz or above for typical parameter sets. In the laboratory for some devices, we find push-actuation for a very small frequency of 50 Hz and thus - in this mainly numerical investigation - revisit and modify the equations commonly used for the description of OEW.(c) 2021 The Author(s). Published by Elsevier B.V. CC_BY_4.0