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Electrocapillary coupling at rough surfaces.

Qibo Deng1, Daniel-Hendrik Gosslar, Maxim Smetanin

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Summary

Surface roughness significantly affects electrocapillary coupling coefficient measurements. A new correction method accounts for roughness, providing accurate coupling coefficients for ideal surfaces, crucial for electro-chemo-mechanical analysis.

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Area of Science:

  • Electrochemistry
  • Surface Science
  • Materials Science

Background:

  • The electrocapillary coupling coefficient (ς) links electrode potential (E) to elastic strain (e) and surface stress (f) to charge density (q).
  • Accurate measurement of ς is vital for understanding electro-chemo-mechanical phenomena.

Purpose of the Study:

  • To investigate the impact of surface roughness on the experimentally measured electrocapillary coupling coefficient (ςeff).
  • To develop a correction method for roughness effects to determine the true coupling coefficient (ς).

Main Methods:

  • Experimental measurement of ςeff for gold thin film electrodes.
  • Surface roughness determination using atomic force microscopy and capacitance ratio method.
  • Analysis of corrugated surface mechanics for correction scheme development.

Main Results:

  • Moderate surface roughness significantly impacts the apparent coupling coefficient (ςeff).
  • A developed correction scheme yields roughness-invariant ς values.
  • Corrected ς values align with theoretical expectations for ideal, planar surfaces.

Conclusions:

  • Surface roughness is a critical factor in electrocapillary coupling coefficient measurements.
  • The proposed correction method is simple and applicable to various experimental techniques.
  • Accurate ς determination is essential for advancing electro-chemo-mechanical studies.