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Related Concept Videos

The Electrical Double Layer01:30

The Electrical Double Layer

In the region where two bulk phases meet, an intricate electric charge distribution arises due to charge transfer, ion adsorption, molecular orientation, and charge distortion. This complex distribution is commonly referred to as the electrical double layer.When a solid electrode interfaces with ions in an electrolyte solution, the speed of electron transfer dictates the rates of oxidation and reduction. The electrode acquires a charge through the escape of atoms into the solution as cations or...
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...
Ion-Exchange Chromatography01:09

Ion-Exchange Chromatography

Ion-exchange chromatography, or IEC, is a technique for separating ions based on their affinity for the stationary phase. The stationary phase is a cross-linked polymer resin with covalently attached ionic functional groups. The functional groups can be either positively charged (cation exchangers) or negatively charged (anion exchangers). A cation exchanger consists of a polymeric anion and active cations, while an anion exchanger is a polymeric cation with active anions. The choice of...
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.
Ionic Crystal Structures02:42

Ionic Crystal Structures

Ionic crystals consist of two or more different kinds of ions that usually have different sizes. The packing of these ions into a crystal structure is more complex than the packing of metal atoms that are the same size.
Most monatomic ions behave as charged spheres, and their attraction for ions of opposite charge is the same in every direction. Consequently, stable structures for ionic compounds result (1) when ions of one charge are surrounded by as many ions as possible of the opposite...
Colloidal precipitates01:09

Colloidal precipitates

The high insolubility of some precipitates can result in an unfavorable relative supersaturation. This can lead to colloidal particles with a large surface-to-mass ratio, where adsorption is promoted. For instance, in the precipitation of silver chloride, silver ions are adsorbed on the surface of the colloidal particles, forming a primary layer. This layer attracts ions of opposite charge (such as nitrate ions), forming a diffuse secondary layer of adsorbed ions. This electric double layer...

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Screening of Coatings for an All-Solid-State Battery Using In Situ Transmission Electron Microscopy
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Double layer in ionic liquids: overscreening versus crowding.

Martin Z Bazant1, Brian D Storey, Alexei A Kornyshev

  • 1Department of Chemical Engineering, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139, USA.

Physical Review Letters
|March 17, 2011
PubMed
Summary
This summary is machine-generated.

We developed a simple theory for solvent-free ionic liquids to predict electrical double-layer structure. The model explains overscreening and finite ion size effects, matching experimental and simulation results.

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Area of Science:

  • Physical Chemistry
  • Materials Science
  • Electrochemistry

Background:

  • Electrical double layers are crucial in electrochemical systems.
  • Understanding ionic liquid behavior is key for energy storage applications.
  • Existing models often simplify ion interactions and size effects.

Purpose of the Study:

  • To develop a continuum theory for solvent-free ionic liquids.
  • To predict the electrical double-layer structure, including overscreening and finite ion size effects.
  • To validate the theory against experimental and simulation data.

Main Methods:

  • Landau-Ginzburg-type continuum theory formulation.
  • Modeling of short-range correlations and steric constraints.
  • Analysis of ion profiles and capacitance-voltage dependence.

Main Results:

  • The theory captures overscreening at low voltages and steric crowding at high voltages.
  • Overscreening is suppressed by counterion crowding as voltage increases.
  • Predicted ion profiles and capacitance-voltage behavior align with simulations and experiments.

Conclusions:

  • The developed theory provides a simple yet effective model for ionic liquid electrical double layers.
  • Finite ion size and correlations significantly influence double-layer structure.
  • The model offers insights into room-temperature ionic liquid behavior.