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Nanoscale Characterization of Liquid-Solid Interfaces by Coupling Cryo-Focused Ion Beam Milling with Scanning Electron Microscopy and Spectroscopy
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Probing Contact-Electrification-Induced Electron and Ion Transfers at a Liquid-Solid Interface.

Jinhui Nie1,2, Zewei Ren1,2, Liang Xu1,2

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Advanced Materials (Deerfield Beach, Fla.)
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Summary

Electron transfer, not ion transfer, dominates liquid-solid contact electrification (CE). This finding clarifies the mechanism at the solid-liquid interface, impacting the understanding of electric double layers.

Keywords:
contact electrificationelectron transferion transferliquid-solid interfaces

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Area of Science:

  • Physical Chemistry
  • Materials Science
  • Tribology

Background:

  • Contact electrification (CE) is a known phenomenon, but its mechanism at liquid-solid interfaces remains debated.
  • While electron transfer explains solid-solid CE, liquid-solid CE mechanisms require further clarification.

Purpose of the Study:

  • To systematically investigate the contact electrification process between various liquids and polytetrafluoroethylene (PTFE) film.
  • To elucidate the dominant electrification mechanism at the solid-liquid interface.

Main Methods:

  • Systematic study of CE between different liquids (deionized water, oil) and PTFE film.
  • Measurement of surface charge density and analysis of charge transfer mechanisms.
  • Comparison of experimental results with ion-transfer models.

Main Results:

  • CE between deionized water and PTFE yielded surface charge densities significantly higher than predicted by ion transfer alone.
  • Increased ion concentration in liquids suppressed charge transfer, indicating ion adsorption hinders electron transfer.
  • Charge transfer was observed between oil (ion-free) and PTFE, confirming electron transfer's role.

Conclusions:

  • Electron transfer is the primary mechanism for liquid-solid contact electrification.
  • The findings challenge traditional models of electric double layer formation at liquid-solid interfaces.
  • This research provides a clearer understanding of CE at the crucial liquid-solid interface.