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Adapting Taylor Dispersion to Measure the Dispersion Coefficient of Electrolyte Solutions via an Accessible Microfluidic Setup
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Mode coupling theory analysis of electrolyte solutions: Time dependent diffusion, intermediate scattering function,

Susmita Roy1, Subramanian Yashonath1, Biman Bagchi1

  • 1Solid State and Structural Chemistry Unit, Indian Institute of Science, Bangalore 560012, India.

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Mode coupling theory (MCT) accurately predicts electrolyte dynamics, including ion diffusion and solvation. Simulations confirm MCT

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Area of Science:

  • Physical Chemistry
  • Theoretical Chemistry
  • Computational Chemistry

Background:

  • Understanding electrolyte dynamics is crucial for various chemical and physical processes.
  • Existing theories often struggle to capture the complex interplay of ions and solvent at different concentrations.

Purpose of the Study:

  • To develop and validate a self-consistent mode coupling theory (MCT) for analyzing electrolyte dynamics.
  • To investigate the concentration dependence of ion diffusion, scattering functions, and solvation dynamics.

Main Methods:

  • Developed a self-consistent mode coupling theory (MCT) using microscopic inputs.
  • Employed Brownian dynamics (BD) with implicit water and molecular dynamics (MD) with explicit water for validation.
  • Calculated concentration-dependent ion diffusion, intermediate scattering functions, and solvation dynamics.

Main Results:

  • MCT predictions for ion diffusion and intermediate scattering functions show quantitative agreement with experimental and simulation data.
  • Increased ion concentration leads to higher frequency dispersion in electrolyte friction due to faster ion atmosphere relaxation.
  • Intermediate scattering functions exhibit distinct relaxation dynamics across different length scales, with step-like relaxation at small wave numbers.

Conclusions:

  • The developed MCT provides a robust framework for studying electrolyte dynamics.
  • Electrolyte concentration significantly impacts ion dynamics, introducing complex relaxation behaviors.
  • Further theoretical and experimental studies are warranted to explore the non-trivial dynamics observed in solvation and ion-ion correlations.