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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...
Noncovalent Attractions in Biomolecules02:35

Noncovalent Attractions in Biomolecules

Noncovalent attractions are associations within and between molecules that influence the shape and structural stability of complexes. These interactions differ from covalent bonding in that they do not involve sharing of electrons.
Four types of noncovalent interactions are hydrogen bonds, van der Waals forces, ionic bonds, and hydrophobic interactions.
Hydrogen bonding results from the electrostatic attraction of a hydrogen atom covalently bonded to a strong-electronegative atom like oxygen,...
Noncovalent Attractions in Biomolecules02:35

Noncovalent Attractions in Biomolecules

Noncovalent attractions are associations within and between molecules that influence the shape and structural stability of complexes. These interactions differ from covalent bonding in that they do not involve sharing of electrons.
Four types of noncovalent interactions are hydrogen bonds, van der Waals forces, ionic bonds, and hydrophobic interactions.
Hydrogen bonding results from the electrostatic attraction of a hydrogen atom covalently bonded to a strong-electronegative atom like oxygen,...
Van der Waals Interactions01:24

Van der Waals Interactions

Atoms and molecules interact with each other through intermolecular forces. These electrostatic forces arise from attractive or repulsive interactions between particles with permanent, partial, or temporary charges. The intermolecular forces between neutral atoms and molecules are ion–dipole, dipole–dipole, and dispersion forces, collectively known as van der Waals forces.Polar molecules have a partial positive charge on one end and a partial negative charge on the other end of the molecule,...
Intermolecular Forces in Solutions02:28

Intermolecular Forces in Solutions

The formation of a solution is an example of a spontaneous process, a process that occurs under specified conditions without energy from some external source.
When the strengths of the intermolecular forces of attraction between solute and solvent species in a solution are no different than those present in the separated components, the solution is formed with no accompanying energy change. Such a solution is called an ideal solution. A mixture of ideal gases (or gases such as helium and argon,...
Theory of Strong Electrolytes01:23

Theory of Strong Electrolytes

The interionic forces of the strong electrolytes depend on the solvent's dielectric constant, which is the ability of a solvent to store electrical energy, based on its polarizability. and the solution's concentration. In high-dielectric solvents and in dilute solutions, weak electrostatic forces keep ions apart. However, in low-dielectric solvents or concentrated solutions, stronger interionic forces may cause ions to pair up as ionic doublets despite being fully ionized. The theory of strong...

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Related Experiment Video

Updated: Jul 17, 2026

Quantitative and Qualitative Examination of Particle-particle Interactions Using Colloidal Probe Nanoscopy
13:15

Quantitative and Qualitative Examination of Particle-particle Interactions Using Colloidal Probe Nanoscopy

Published on: July 18, 2014

Liquid-structure forces and electrostatic modulation of biomolecular interactions in solution.

Sergio A Hassan1

  • 1Center for Molecular Modeling, DCB/CIT, National Institutes of Health, U.S. DHHS, Bethesda, Maryland 20892, USA.

The Journal of Physical Chemistry. B
|January 5, 2007
PubMed
Summary

This study presents a new model for molecular dynamics simulations, enhancing electrostatic and liquid-structure forces. It accurately captures solvent effects near biomolecules, improving predictions of molecular interactions.

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Molecular Spring Constant Analysis by Biomembrane Force Probe Spectroscopy

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Quantitative and Qualitative Examination of Particle-particle Interactions Using Colloidal Probe Nanoscopy
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Area of Science:

  • Computational chemistry
  • Molecular dynamics
  • Biophysics

Background:

  • Molecular interactions in solution are influenced by bulk solvent and structured solvent layers near solutes.
  • Conventional continuum models simplify solvent effects, limiting accuracy for biomolecular simulations.

Purpose of the Study:

  • To present a novel model for electrostatic and liquid-structure forces in biomolecular dynamics simulations.
  • To incorporate microscopic solvent properties and non-pairwise forces for improved accuracy.
  • To enhance the representation of solvent effects beyond traditional continuum methods.

Main Methods:

  • Developed a model treating solvent as polar, polarizable, with inhomogeneous dielectric permittivity based on Onsager theory.
  • Incorporated non-pairwise liquid-structure forces using external centers of force at liquid density peaks.
  • Calculated density via barometric law with Lennard-Jones-type solute-liquid potential.
  • Validated the model with alkali/halide ions, ion pairs, and polar/charged amino acid dimers.

Main Results:

  • The model accurately reproduces intermolecular potentials of mean force for amino acid dimers, including contact and solvent-separated minima.
  • It captures desolvation barriers, aligning with results from atomistic dynamics simulations.
  • Demonstrated effective simulation of electrostatic and liquid-structure forces in complex molecular systems.

Conclusions:

  • The presented model offers a more accurate representation of solvent effects in molecular dynamics simulations.
  • It successfully models key features of intermolecular interactions, crucial for understanding biomolecular behavior.
  • Future refinements can further improve the treatment of molecular correlations for enhanced predictive power.