Triboelectric wetting for continuous droplet transport

Author:

Xu Wanghuai12ORCID,Jin Yuankai1ORCID,Li Wanbo1ORCID,Song Yuxin1ORCID,Gao Shouwei1ORCID,Zhang Baoping1ORCID,Wang Lili1,Cui Miaomiao1,Yan Xiantong1ORCID,Wang Zuankai12ORCID

Affiliation:

1. Department of Mechanical Engineering, City University of Hong Kong, Hong Kong 999077, China.

2. Department of Mechanical Engineering, The Hong Kong Polytechnic University, Hong Kong 999077, China.

Abstract

Manipulating liquid is of great significance in fields from life sciences to industrial applications. Owing to its advantages in manipulating liquids with high precision and flexibility, electrowetting on dielectric (EWOD) has been widely used in various applications. Despite this, its efficient operation generally needs electrode arrays and sophisticated circuit control. Here, we develop a largely unexplored triboelectric wetting (TEW) phenomenon that can directly exploit the triboelectric charges to achieve the programmed and precise water droplet control. This key feature lies in the rational design of a chemical molecular layer that can generate and store triboelectric charges through agile triboelectrification. The TEW eliminates the requirement of the electric circuit design and additional source input and allows for manipulating liquids of various compositions, volumes, and arrays on various substrates in a controllable manner. This previously unexplored wetting mechanism and control strategy will find diverse applications ranging from controllable chemical reactions to surface defogging.

Publisher

American Association for the Advancement of Science (AAAS)

Subject

Multidisciplinary

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