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Ionic Association

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.

Intermolecular Forces

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...

Solubility of Ionic Compounds

Solubility of Ionic Compounds

Solubility is the measure of the maximum amount of solute that can be dissolved in a given quantity of solvent at a given temperature and pressure. Solubility is usually measured in molarity (M) or moles per liter (mol/L). A compound is termed soluble if it dissolves in water.

Common Ion Effect

Common Ion Effect

Compared with pure water, the solubility of an ionic compound is less in aqueous solutions containing a common ion (one also produced by dissolution of the ionic compound). This is an example of a phenomenon known as the common ion effect, which is a consequence of the law of mass action that may be explained using Le Châtelier’s principle. Consider the dissolution of silver iodide:

Colloids

Colloids

Children at play often make suspensions such as mixtures of mud and water, flour and water, or a suspension of solid pigments in water known as tempera paint. These suspensions are heterogeneous mixtures composed of relatively large particles that are visible to the naked eye or can be seen with a magnifying glass. They are cloudy, and the suspended particles settle out after mixing. On the other hand, a solution is a homogeneous mixture in which no settling occurs and in which the dissolved...

Solubility

Solubility

Solution, Solubility, and Solubility Equilibrium
A solution is a homogeneous mixture composed of a solvent, the major component, and a solute, the minor component. The physical state of a solution—solid, liquid, or gas—is typically the same as that of the solvent. Solute concentrations are often described with qualitative terms such as dilute (of relatively low concentration) and concentrated (of relatively high concentration).
In a solution, the solute particles (molecules, atoms, and/or ions)...

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Related Experiment Video

Updated: Jul 3, 2026

Synthesis of Ionic Liquid Based Electrolytes, Assembly of Li-ion Batteries, and Measurements of Performance at High Temperature

Synthesis of Ionic Liquid Based Electrolytes, Assembly of Li-ion Batteries, and Measurements of Performance at High Temperature

Published on: December 20, 2016

Aggregation behavior of long-chain ionic liquids in an ionic liquid.

Na Li¹, Shaohua Zhang, Liqiang Zheng

¹Key Laboratory of Colloid and Interface Chemistry (Shandong University), Ministry of Education, Jinan, 250100, China.

Physical Chemistry Chemical Physics : PCCP

|July 26, 2008

Summary

Long-chain ionic liquids form unusually large spherical aggregates in a different ionic liquid. These findings advance understanding of ionic liquid aggregation and self-assembly in complex fluid systems.

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Area of Science:

Physical Chemistry
Materials Science
Supramolecular Chemistry

Background:

Ionic liquids (ILs) are tunable solvents with unique properties.
Understanding IL aggregation is crucial for designing advanced materials and processes.
Limited research exists on the aggregation of long-chain ILs within other ILs.

Purpose of the Study:

To investigate the aggregation behavior of 1-alkyl-3-methylimidazolium bromide (C(n)mimBr) in 1-butyl-3-methylimidazolium tetrafluoroborate (bmimBF(4)).
To characterize the size and morphology of C(n)mimBr aggregates.
To explore the implications for IL-based systems.

Main Methods:

Surface tension measurements to detect aggregate formation.
Freeze fracture transmission electron microscopy (FF-TEM) for visualizing aggregate morphology.
Dynamic light scattering (DLS) for confirming aggregate size.

Main Results:

C(n)mimBr forms distinct aggregates in bmimBF(4).
FF-TEM revealed spherical aggregates significantly larger than conventional micelles.
DLS measurements corroborated the large aggregate sizes.

Conclusions:

Long-chain ionic liquids can form unique, large supramolecular structures in IL solvents.
The observed aggregation behavior differs significantly from typical micelle formation.
This study provides novel insights into the self-assembly of ionic liquids.