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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...
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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 bonds, and dispersion...
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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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Vibrational Spectra of a N719-Chromophore/Titania Interface from Empirical-Potential Molecular-Dynamics Simulation, Solvated by a Room Temperature Ionic Liquid
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Ion-ion correlation attraction in a molecular solvent.

Luís Pegado1, Bo Jönsson, Håkan Wennerström

  • 1Physical Chemistry 1, Center for Chemistry and Chemical Engineering, Lund University, P.O. Box 124, Lund SE-22100, Sweden. luis.pegado@fkem1.lu.se

The Journal of Chemical Physics
|December 3, 2008
PubMed
Summary

Monte Carlo simulations reveal an attractive pressure minimum between like-charged plates with counterions and solvent. This attraction diminishes with lower counterion valency or increased screening, with molecular solvent and primitive models showing similar ion correlation effects.

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Area of Science:

  • Physical Chemistry
  • Colloid Science
  • Computational Physics

Background:

  • Understanding interactions between charged surfaces in electrolyte solutions is crucial for various applications.
  • Ion correlations and solvent effects significantly influence interfacial forces.

Purpose of the Study:

  • To investigate the pressure and interaction free energies between two like-charged infinite plates immersed in a solvent with counterions.
  • To compare the role of solvent models (primitive model vs. Stockmayer fluid) on ion correlation effects.

Main Methods:

  • Monte Carlo simulations were employed to model the system.
  • Two solvent models were used: the primitive model (PM) and a Stockmayer fluid.
  • Analysis of pressure profiles and interaction free energies.

Main Results:

  • An attractive pressure minimum was observed at high coupling, dependent on counterion valency and surface charge density.
  • Increased screening reduced or eliminated the attractive minimum.
  • Higher densities led to more oscillatory pressure profiles, masking the underlying attraction.
  • Both PM and Stockmayer fluid models yielded similar qualitative ion correlation pictures.

Conclusions:

  • Ion-ion correlations are responsible for the observed attraction between like-charged plates.
  • Interaction free energy provides a clearer interpretation than pressure alone.
  • The choice of solvent model (PM or molecular) does not alter the fundamental ion correlation effects influencing interfacial forces.