Controllable high-speed electrostatic manipulation of water droplets on a superhydrophobic surface

Haoyu Dai, Can Gao, Junhan Sun, Chuxin Li, Ning Li, Lei Wu, Zhichao Dong, Lei Jiang

Research output: Contribution to journalArticleResearchpeer-review

11 Citations (Scopus)

Abstract

Biological processes and technological applications cannot work without liquid control, where versatile water droplet manipulation is a significant issue. Droplet motion is conventionally manipulated by functionalizing the target surface or by utilizing additives in the droplet, still, with uncontrolled limitation on superhydrophobic surfaces since droplets are either unable to move fast or are difficult to stop while moving. A controllable high-speed “all-in-one” no-loss droplet manipulation, that is, in-plane moving and stopping/pinning in any direction on a superhydrophobic surface, with electrostatic charging is demonstrated. The experimental results reveal that the transport speed can vary from zero to several hundreds of millimeters per second. Controlled dynamic switching between the onset moving state and the offset pinning state of a water droplet can be achieved by out-of-plane electrostatic charging. This work opens the possibility of droplet control techniques in various applications, such as combinatory chemistry, biochemical, and medical detection.

Original languageEnglish
Article number1905449
Number of pages6
JournalAdvanced Materials
Volume31
Issue number43
DOIs
Publication statusPublished - 25 Oct 2019
Externally publishedYes

Keywords

  • droplet manipulation
  • electrostatics
  • superhydrophobic surfaces

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