Hao Chonglei, Liu Yahua, Chen Xuemei, He Yuncheng, Li Qiusheng, Li K Y, Wang Zuankai
Department of Mechanical and Biomedical Engineering, City University of Hong Kong, Hong Kong, China.
Department of Civil and Architectural Engineering, City University of Hong Kong, Hong Kong, China.
Sci Rep. 2014 Oct 30;4:6846. doi: 10.1038/srep06846.
Electrowetting on dielectric (EWOD) has emerged as a powerful tool to electrically manipulate tiny individual droplets in a controlled manner. Despite tremendous progress over the past two decades, current EWOD operating in ambient conditions has limited functionalities posing challenges for its applications, including electronic display, energy generation, and microfluidic systems. Here, we demonstrate a new paradigm of electrowetting on liquid-infused film (EWOLF) that allows for complete reversibility and tunable transient response simultaneously. We determine that these functionalities in EWOLF are attributed to its novel configuration, which allows for the formation of viscous liquid-liquid interfaces as well as additional wetting ridges, thereby suppressing the contact line pinning and severe droplet oscillation encountered in the conventional EWOD. Finally, by harnessing these functionalities demonstrated in EWOLF, we also explore its application as liquid lens for fast optical focusing.
介电电泳（EWOD）已成为一种强大的工具，可用于以可控方式对微小的单个液滴进行电操纵。尽管在过去二十年中取得了巨大进展，但当前在环境条件下运行的EWOD功能有限，这对其应用（包括电子显示、能量产生和微流体系统）构成了挑战。在此，我们展示了一种在注入液体的薄膜上进行电润湿（EWOLF）的新范例，它能够同时实现完全可逆性和可调瞬态响应。我们确定，EWOLF中的这些功能归因于其新颖的结构，该结构允许形成粘性液 - 液界面以及额外的润湿脊，从而抑制了传统EWOD中遇到的接触线钉扎和严重的液滴振荡。最后，通过利用EWOLF中展示的这些功能，我们还探索了其作为快速光学聚焦液体透镜的应用。
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