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Field-Dependent Ionic Conductivities from Generalized Fluctuation-Dissipation Relations.

Dominika Lesnicki1, Chloe Y Gao2, Benjamin Rotenberg1,3

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This summary is machine-generated.

Ionic conductivity depends on electric fields. Molecular dynamics simulations reveal conductivity increases with field strength in weaker electrolytes and molten salts due to suppressed ionic correlations.

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Area of Science:

  • Physical Chemistry
  • Computational Chemistry
  • Statistical Mechanics

Background:

  • Ionic conductivity is crucial for understanding electrolyte behavior.
  • Nonlinear effects in ionic conductivity are known but not fully understood at a microscopic level.

Purpose of the Study:

  • To derive a theoretical relationship for electric field-dependent ionic conductivity.
  • To investigate the microscopic origins of nonlinear ionic conductivity using molecular dynamics.

Main Methods:

  • Derivation of a theoretical relationship based on fluctuations of microscopic variables.
  • Molecular dynamics simulations of electrolytes and molten salts under varying ionic strengths.
  • Application of a novel nonequilibrium statistical reweighting scheme for continuous conductivity calculation.

Main Results:

  • Found Gaussian fluctuations of ionic current in strong electrolytes, leading to field-independent conductivity.
  • Observed non-Gaussian fluctuations in weaker electrolytes and molten salts, resulting in field-dependent conductivity.
  • Demonstrated that conductivity increases with applied field in weaker electrolytes and molten salts.

Conclusions:

  • The Onsager-Wien effect is a general phenomenon arising from the suppression of ionic correlations at high fields.
  • Microscopic fluctuations and correlations play a key role in determining electric field-dependent ionic conductivity.
  • The developed formalism provides a framework for understanding nonlinear ionic transport in various electrolyte systems.