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Related Concept Videos

Ionic Association01:28

Ionic Association

The ionic association is the association of oppositely charged ions in an electrolyte solution to form ion pairs. Bjerrum defined ion pairs as two oppositely charged ions whose electrostatic attraction exceeds the thermal energy of the system, typically expressed as 2kT. Electrostatic attraction depends on ionic charge, separation distance, and the dielectric constant of the medium. Thermal energy, represented by kT, reflects the tendency of ions to move independently due to molecular motion.
Theory of Strong Electrolytes01:23

Theory of Strong Electrolytes

The interionic forces of the strong electrolytes depend on the solvent's dielectric constant, which is the ability of a solvent to store electrical energy, based on its polarizability. and the solution's concentration. In high-dielectric solvents and in dilute solutions, weak electrostatic forces keep ions apart. However, in low-dielectric solvents or concentrated solutions, stronger interionic forces may cause ions to pair up as ionic doublets despite being fully ionized. The theory of strong...
Intermolecular Forces03:13

Intermolecular Forces

Atoms and molecules interact through bonds (or forces): intramolecular and intermolecular. The forces are electrostatic as they arise from interactions (attractive or repulsive) between charged species (permanent, partial, or temporary charges) and exist with varying strengths between ions, polar, nonpolar, and neutral molecules. The different types of intermolecular forces are ion–dipole, dipole–dipole, hydrogen bonds, and dispersion; among these, dipole–dipole, hydrogen bonds, and dispersion...
The Debye–Hückel Theory of Electrolyte Solutions01:27

The Debye–Hückel Theory of Electrolyte Solutions

The Debye–Hückel theory, established by Peter Debye and Erich Hückel in 1923, is a fundamental concept in physical chemistry. It provides an understanding of the behavior of strong electrolytes in solution, particularly explaining their deviations from ideal behavior.The theory is based on Coulombic interactions (the attraction or repulsion between charged particles) between ions in solution. In an ionic solution, oppositely charged ions tend to attract each other. This means that cations...
Ion Exchange01:17

Ion Exchange

Ion exchange chromatography separates charged molecules from a solution by reversibly exchanging them with mobile, or 'active', ions associated with the oppositely charged stationary phase. This method can be used to separate ions, soften and deionize water, and purify solutions. The polymers comprising the ion-exchange column are high-molecular-weight and chemically stable polymers, crosslinked to be porous and essentially insoluble. They are also functionalized with either acidic or basic...
Ionic Bonds00:42

Ionic Bonds

Overview
When atoms gain or lose electrons to achieve a more stable electron configuration they form ions. Ionic bonds are electrostatic attractions between ions with opposite charges. Ionic compounds are rigid and brittle when solid and may dissociate into their constituent ions in water. Covalent compounds, by contrast, remain intact unless a chemical reaction breaks them.
Opposing Charges Hold Ions Together in Ionic Compounds
Ionic bonds are reversible electrostatic interactions between ions...

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Updated: May 9, 2026

Merging Ion Concentration Polarization between Juxtaposed Ion Exchange Membranes to Block the Propagation of the Polarization Zone
08:06

Merging Ion Concentration Polarization between Juxtaposed Ion Exchange Membranes to Block the Propagation of the Polarization Zone

Published on: February 23, 2017

Field-driven ion pairing dynamics in concentrated electrolytes.

Seokjin Moon1, David T Limmer1,2,3,4

  • 1Department of Chemistry, University of California, Berkeley, California 94720, USA.

The Journal of Chemical Physics
|May 8, 2026
PubMed
Summary
This summary is machine-generated.

We studied ion pairing dynamics in electrolytes using simulations. We found that electric fields nonlinearly enhance conductivity, challenging classical theories and highlighting the importance of molecular details in electrolyte transport.

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Area of Science:

  • Physical Chemistry
  • Computational Chemistry
  • Chemical Physics

Background:

  • Ion pairing dynamics are crucial for electrolyte conductivity.
  • Understanding electrolyte behavior under external fields is essential for electrochemical applications.
  • Classical theories often simplify complex molecular interactions in electrolytes.

Purpose of the Study:

  • To investigate ion pairing dynamics in electrolytes driven far from equilibrium.
  • To quantify the nonlinear enhancement of conductivity under electric fields.
  • To compare simulation results with classical theories like Onsager's theory.

Main Methods:

  • Molecular simulations
  • Nonequilibrium rate theory
  • Transition path theory (TPT)
  • Calculation of reactive fluxes and mean first-passage times
  • Dynamical proxy for free-ion population

Main Results:

  • Nonlinear enhancement of conductivity observed, with a 40% increase in acetonitrile at 50 mV/Å.
  • Classical Onsager theory overestimates field-induced ion pair dissociation.
  • Solvent-mediated dynamics and field-induced dielectric decrement suppress ion pair dissociation.

Conclusions:

  • Molecular simulations provide a more accurate description of nonlinear electrolyte transport than continuum theories.
  • Explicit solvent effects and molecular details are critical for understanding electrolyte behavior under electric fields.
  • A general framework for nonequilibrium reaction kinetics in condensed phases is established.