Electrowetting on liquid-infused film (EWOLF): Complete reversibility and controlled droplet oscillation suppression for fast optical imaging

Chonglei Hao; Yahua Liu; Xuemei Chen; Yuncheng He; Qiusheng Li; K. Y. Li; Zuankai Wang

doi:10.1038/srep06846

Author(s)

Chonglei Hao
Yahua Liu
Xuemei Chen
Yuncheng He

Related Research Unit(s)

Department of Mechanical and Biomedical Engineering
Shenzhen Research Institute

Detail(s)

Original language	English
Article number	6846
Journal / Publication	Scientific Reports
Volume	4
Online published	30 Oct 2014
Publication status	Published - 2014

Link(s)

DOI	DOI https://doi.org/10.1038/srep06846 Final Published version
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Attachment(s)	Documents Final Published Version Final Published version, 774 KB, PDF Publisher's Copyright Statement This full text is made available under CC-BY 4.0. https://creativecommons.org/licenses/by/4.0/
Link to Scopus	https://www.scopus.com/record/display.uri?eid=2-s2.0-84923333985&origin=recordpage
Permanent Link	https://scholars.cityu.edu.hk/en/publications/publication(4bf75df3-0a7d-4712-8bc5-d1d08e36c598).html

Abstract

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.