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The Preparation of Electrohydrodynamic Bridges from Polar Dielectric Liquids
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Spontaneous Wetting Induced by Contact-Electrification at Liquid-Solid Interface.

Zhen Tang1,2, Dan Yang3, Hengyu Guo4

  • 1Beijing Institute of Nanoenergy and Nanosystems, Chinese Academy of Sciences, Beijing, 101400, P. R. China.

Advanced Materials (Deerfield Beach, Fla.)
|March 26, 2024
PubMed
Summary
This summary is machine-generated.

Contact electrification (CE) induces spontaneous wetting (CEW) in dielectric films. Surface charge density directly correlates with contact angle changes, impacting static and dynamic wetting behaviors.

Keywords:
atomic force microscopycharge probetriboelectrificationwetting

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Area of Science:

  • Surface Science and Interfacial Phenomena
  • Triboelectricity and Electrostatics
  • Materials Science

Background:

  • Wettability is crucial for liquid-solid interface interactions, but is complicated by charge exchange during contact electrification (CE).
  • Quantifying the influence of triboelectric charge on wettability is challenging due to difficulties in simultaneously measuring contact angles and electrical signals.

Purpose of the Study:

  • To investigate the relationship between surface charge density and contact angle changes in dielectric films after interaction with water droplets.
  • To explore the phenomenon of contact electrification induced wetting (CEW) and its underlying mechanisms.

Main Methods:

  • Experimental measurement of contact angles and surface charge density on dielectric films after water droplet contact.
  • Continuous contact electrification induced wetting (CEW) tests to analyze static and dynamic wetting behaviors.
  • Ab initio calculations to elucidate the interfacial energy changes and hydrogen bonding interactions.

Main Results:

  • Observed spontaneous wetting phenomenon termed contact electrification induced wetting (CEW) due to charge exchange between water and dielectric films.
  • Demonstrated a linear dependence between the change in contact angle (CA) and the surface charge density.
  • Confirmed that accumulated charges influence both static CA and wetting dynamics.

Conclusions:

  • CEW is driven by charge redistribution at the solid-liquid interface, reducing interfacial energy and contact angle.
  • Enhanced surface charge strengthens hydrogen bonding between water and the substrate, contributing to reduced interfacial energy.
  • Findings advance the understanding of CE and wetting, with implications for energy harvesting, catalysis, and droplet manipulation.