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Related Concept Videos

Micelles01:30

Micelles

110
Micelle formation is an intricate process that hinges on the properties of amphiphilic or amphipathic molecules and the conditions of the system in which they are found. Amphiphilic molecules, which have both hydrophilic (water-attracting) and hydrophobic (water-repelling) parts, play a critical role in this process.In aqueous environments, these molecules arrange themselves such that their hydrophilic heads are turned towards the water phase, while their hydrophobic tails are oriented away...
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Intermolecular Forces and Physical Properties02:56

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Molecular and Ionic Solids

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Crystalline solids are divided into four types: molecular, ionic, metallic, and covalent network based on the type of constituent units and their interparticle interactions.
Molecular Solids
Molecular crystalline solids, such as ice, sucrose (table sugar), and iodine, are solids that are composed of neutral molecules as their constituent units. These molecules are held together by weak intermolecular forces such as London dispersion forces, dipole-dipole interactions, or hydrogen bonds, which...
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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...
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Intermolecular Forces

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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...
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Ionic Association01:28

Ionic Association

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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.
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Updated: Mar 12, 2026

From Molecules to Materials: Engineering New Ionic Liquid Crystals Through Halogen Bonding
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Which structural features stand behind micelization of ionic liquids? Quantitative Structure-Property Relationship

Maciej Barycki1, Anita Sosnowska1, Tomasz Puzyn1

  • 1Laboratory of Environmental Chemometrics, Faculty of Chemistry, University of Gdańsk, ul. Wita Stwosza 63, 80-308 Gdańsk, Poland.

Journal of Colloid and Interface Science
|November 6, 2016
PubMed
Summary

Ionic liquids (ILs) micellization is influenced by ion structure. Longer, less spherical cations and larger anions decrease the critical micellization concentration (CMC), with independent ion effects.

Keywords:
CMCIonic liquidMicellePredictingQSPRSurfactant

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Area of Science:

  • Physical Chemistry
  • Materials Science
  • Supramolecular Chemistry

Background:

  • Ionic liquids (ILs) exhibit tunable properties based on their constituent ions.
  • The Critical Micellization Concentration (CMC) is a key property influenced by IL structure.
  • Understanding ion-specific contributions to micellization is crucial for designing ILs with desired characteristics.

Purpose of the Study:

  • To identify and quantitatively describe structural features of ions that influence micellization in ILs.
  • To determine if micellization is governed by single ion effects or mutual ion interactions.
  • To develop a predictive model for CMC in ILs.

Main Methods:

  • Quantitative Structure-Property Relationship (QSPR) approach was employed.
  • Molecular GEometry, Topology, and Atom-Weights AssemblY (GETAWAY) descriptors were used to represent structural features.
  • A QSPR model was developed, validated, and used to predict CMC for a large set of designed ILs.

Main Results:

  • Longer cations with large hydrophobic domains and less spherical, unfolded structures decrease CMC.
  • Larger anions also contribute to a decrease in CMC.
  • The study found that cation and anion influences on CMC are independent.

Conclusions:

  • The structural characteristics of individual ions significantly impact the micellization behavior of ionic liquids.
  • The developed QSPR model provides a robust method for assessing CMC in ILs.
  • The findings support the independent contribution of cations and anions to the CMC of ionic liquids.