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Related Experiment Video

Updated: Feb 1, 2026

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Self-propelled droplet-based electricity generation.

Chaoran Liu1, Jing Sun2, Yu Zhuang2

  • 1College of Electronics and Information, Hangzhou Dianzi University, Hangzhou 310018, China and Science and Technology on Microsystem Laboratory, Shanghai Institute of Microsystem and Information Technology, Chinese Academy of Sciences, Shanghai 200050, China. zhouxiaofeng@mail.sim.ac.cn.

Nanoscale
|December 6, 2018
PubMed
Summary
This summary is machine-generated.

Self-propelled droplets generate electricity using surface wetting gradients. This novel method for energy harvesting requires no external power and can be optimized by controlling droplet size and wetting properties.

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Area of Science:

  • Surface Science
  • Energy Harvesting
  • Fluid Dynamics

Background:

  • Droplet transport is common in nature and offers potential for mass transfer, momentum transfer, and energy conversion.
  • Controlling droplet movement is key to unlocking their full potential in various applications.

Purpose of the Study:

  • To demonstrate electricity generation from self-propelled droplet motion driven by surface wetting gradients.
  • To analyze the mechanism of voltage generation and explore methods for optimization.

Main Methods:

  • Utilized a surface wetting gradient to induce self-propelled motion in droplets.
  • Performed analytical analysis to understand the relationship between surface charge, interfaces, and output voltage.
  • Experimentally validated the electricity generation capabilities of a 25 μL droplet.

Main Results:

  • Achieved reliable electricity generation from self-propelled droplets without external energy input.
  • Demonstrated that output voltage is modulated by surface charge distribution at dynamic solid/liquid interfaces.
  • A 25 μL droplet generated a peak current of 93.5 nA and a maximum output power of 2.4 nW.

Conclusions:

  • Self-propelled droplet motion driven by wetting gradients offers a novel pathway for energy harvesting.
  • The generated voltage can be programmed by adjusting the wetting gradient and droplet size.
  • This research opens new possibilities for optimizing energy harvesting devices utilizing liquid-solid interfaces.