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The Influence of Microscale Surface Roughness on Water-Droplet Contact Electrification
1Department of Physics and Technology , University of Bergen , Allegaten 55, 5020 Bergen , Norway.
Langmuir : the ACS Journal of Surfaces and Colloids
|May 31, 2019
Summary
Reducing triboelectric charging on hydrophobic fluoropolymers is possible by transitioning to a superhydrophobic fakir state. This surface modification minimizes liquid-solid contact, impacting charge-sensitive electronics and energy harvesting applications.
Area of Science:
- Materials Science
- Tribology
- Surface Chemistry
Background:
- Hydrophobic fluoropolymers generate triboelectric charge upon contact with water.
- Surface microstructuring can alter liquid-solid interactions.
Purpose of the Study:
- Investigate the relationship between microscale surface statistics and triboelectric charge formation.
- Determine the effect of superhydrophobic states on tribocharging.
- Assess implications for charge-sensitive electronics and energy harvesting.
Main Methods:
- Fabrication of fluoropolymer surfaces with varying microscale statistics.
- Contact angle measurements to confirm superhydrophobic states.
- Triboelectric charge measurement upon water droplet impact.
- Analysis of liquid-solid contact area.
Main Results:
- Transitioning to a superhydrophobic fakir state significantly reduces triboelectric contact charge.
- Reduced liquid-solid contact area is the primary cause for decreased charging.
- Superhydrophobic surfaces enhance water droplet velocity but decrease collected charge in energy harvesting setups.
Conclusions:
- Microscale surface engineering of fluoropolymers can control triboelectric charging.
- Superhydrophobic fakir states offer a method to minimize unwanted tribocharging.
- Careful surface assessment is crucial for optimizing microstructured polymers in water droplet energy harvesting.
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