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Related Concept Videos

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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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An ionic compound is stable because of the electrostatic attraction between its positive and negative ions. The lattice energy of a compound is a measure of the strength of this attraction. The lattice energy (ΔHlattice) of an ionic compound is defined as the energy required to separate one mole of the solid into its component gaseous ions. For the ionic solid sodium chloride, the lattice energy is the enthalpy change of the process:
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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.
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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.
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From Molecules to Materials: Engineering New Ionic Liquid Crystals Through Halogen Bonding
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Stability of Two-Dimensional Ionic Clusters at Solid-Liquid Interfaces.

Feng Liu1, Di Zhao1, Deyan Sun1

  • 1Engineering Research Center for Nanophotonics & Advanced Instrument (MOE), School of Physics and Electronic Science, East China Normal University, Shanghai 200241, China.

Langmuir : the ACS Journal of Surfaces and Colloids
|May 18, 2021
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Summary

Two-dimensional clusters (2DCs) exhibit odd-even stability alternations at ionic crystal-solution interfaces. This phenomenon, influenced by ion charge and water interactions, is crucial for understanding crystal nucleation.

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Area of Science:

  • Materials Science
  • Physical Chemistry
  • Computational Chemistry

Background:

  • The behavior of ionic clusters at interfaces is critical for understanding crystallization processes.
  • Investigating the stability of two-dimensional clusters (2DCs) provides insights into nucleation phenomena.

Purpose of the Study:

  • To investigate the stability of two-dimensional clusters (2DCs) at the interface between ionic crystals and solutions.
  • To elucidate the factors governing the observed stability patterns of these clusters.

Main Methods:

  • Molecular dynamics simulations were employed to model the ionic crystal-solution interface.
  • Analysis focused on the stability of 2DCs with varying numbers of ions.

Main Results:

  • A remarkable odd-even alternation in the stability of 2DCs was discovered.
  • In NaCl and NaBr, odd-numbered clusters were more stable; in KCl, even-numbered clusters were more stable.
  • The stability of water molecules in the hydration shell mirrored the 2DC stability, showing odd-even alternation.

Conclusions:

  • The odd-even stability alternation is attributed to a balance between Coulomb repulsion and charge-dipole interactions.
  • This phenomenon is likely universal in similar ionic systems.
  • Understanding this alternation is key for comprehending solution nucleation and crystallization on ionic crystal surfaces.