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The ionic strength of a solution is a quantitative way of expressing the total electrolyte concentration of a solution. This concept was first introduced in 1921 by two American physical chemists, Gilbert N. Lewis and Merle Randall, while describing the activity coefficient of strong electrolytes. During the calculation of ionic strength (I or μ), all the cations and anions are considered. However, the concentration (c) of an ion with a greater charge number (z) has a greater contribution...
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Quantitative Relation between Ionic Diffusivity and Ionic Association in Ionic Liquid-Water Mixtures.

Shuting Xu1,2, Yawei Liu1, Xuefu Li1

  • 1Beijing Key Laboratory of Ionic Liquids Clean Process, CAS Key Laboratory of Green Process and Engineering, State Key Laboratory of Multiphase Complex Systems, Institute of Process Engineering, Chinese Academy of Sciences, Beijing 100190, P. R. China.

The Journal of Physical Chemistry Letters
|March 9, 2023
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Summary
This summary is machine-generated.

Molecular dynamic simulations reveal two distinct regimes governing ionic diffusivity in ionic liquid-water mixtures. These regimes correlate ionic association with diffusivity, offering new insights into liquid behavior.

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Area of Science:

  • Physical Chemistry
  • Materials Science
  • Computational Chemistry

Background:

  • Ionic liquids (ILs) are salts that are liquid at low temperatures.
  • Water content significantly influences the structure and dynamics of ILs.
  • Understanding IL-water mixtures is crucial for applications in various fields.

Purpose of the Study:

  • To investigate the relationship between microscopic structure and ionic diffusivity in aqueous IL mixtures.
  • To identify distinct regimes of ionic diffusivity based on water concentration.
  • To quantify the correlation between ionic association and dynamic properties.

Main Methods:

  • Molecular dynamic simulations were employed to model aqueous mixtures of imidazolium ionic liquids.
  • Analysis focused on average ionic diffusivity (D_ave) and its dependence on water concentration.
  • Ionic association, ion-pair lifetimes (τ_IP), and short-ranged ion interactions (Ẽ_ions) were quantified.

Main Results:

  • Two regimes of D_ave were identified: a 'jam' regime with slow increase and an 'exponential' regime with rapid increase.
  • Both regimes showed a direct correlation between D_ave and the degree of ionic association.
  • General relationships were established between D_ave and 1/τ_IP (linear) and normalized diffusivities and Ẽ_ions (exponential).

Conclusions:

  • Ionic association is a key determinant of ionic diffusivity in IL-water mixtures.
  • The study provides quantitative relationships linking dynamic properties and ionic association, independent of specific IL species.
  • Findings offer fundamental insights for designing IL-based materials and processes.