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Related Concept Videos

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...
Intermolecular Forces03:13

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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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Electric Field of Two Equal and Opposite Charges

Atoms generally contain the same number of positively and negatively charged particles, protons, and electrons. Hence, they are electrically neutral. However, the centers of the positive and negative charges do not always coincide. In such a scenario, the electric field of an atom may not be zero.
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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.
Potential Due to a Polarized Object01:29

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A neutral atom consists of a positively charged nucleus surrounded by a negatively charged electron cloud. When placed in an external electric field, the external electric force pulls the electrons and nucleus apart, opposite to the intrinsic attraction between the nucleus and the electrons. The opposing forces balance each other with a slight shift between the center of masses of the nucleus and the electron cloud, resulting in a polarized atom. On the other hand, a few molecules, like water,...

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Repulsion between oppositely charged planar macroions.

YongSeok Jho1, Frank L H Brown, MahnWon Kim

  • 1Asia Pacific Center for Theoretical Physics, Pohang, Gyeongbuk-do, Korea. ysjho@apctp.org

Plos One
|August 14, 2013
PubMed
Summary
This summary is machine-generated.

Oppositely charged macroions exhibit repulsion due to osmotic pressure and ionic screening. Factors like surface charge density and solvent dielectric constant significantly influence this repulsive interaction.

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Area of Science:

  • Colloid and Interface Science
  • Physical Chemistry
  • Computational Physics

Background:

  • Macroion interactions are fundamental in various chemical and biological systems.
  • Understanding repulsive forces is crucial for controlling colloidal stability and self-assembly.
  • Previous models often simplified surface charge characteristics.

Purpose of the Study:

  • To investigate the repulsive forces between oppositely charged macroions.
  • To elucidate the roles of surface charge properties and solvent dielectric effects.
  • To explore factors influencing charge inversion phenomena.

Main Methods:

  • Grand Canonical Monte Carlo (GCMC) simulations.
  • Utilized an unrestricted primitive model for macroion-electrolyte systems.
  • Systematically varied parameters: surface charge density, depth, cation size, and dielectric permittivity.

Main Results:

  • Repulsion originates from a combination of osmotic pressure and ionic screening.
  • Increased surface charge density and decreased solvent dielectric constant enhance repulsion.
  • Smaller cation size and surface charge discreteness promote repulsion and charge inversion.

Conclusions:

  • The study provides a comprehensive understanding of macroion repulsion mechanisms.
  • Simulation results align well with experimental observations.
  • Identified key parameters for tuning colloidal interactions and preventing aggregation.