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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

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 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,...
Aqueous Solutions and Heats of Hydration02:42

Aqueous Solutions and Heats of Hydration

Water and other polar molecules are attracted to ions. The electrostatic attraction between an ion and a molecule with a dipole is called an ion-dipole attraction. These attractions play an important role in the dissolution of ionic compounds in water.
When ionic compounds dissolve in water, the ions in the solid separate and disperse uniformly throughout the solution because water molecules surround and solvate the ions, reducing the strong electrostatic forces between them. This process...
Solubility03:00

Solubility

Solution, Solubility, and Solubility Equilibrium
A solution is a homogeneous mixture composed of a solvent, the major component, and a solute, the minor component. The physical state of a solution—solid, liquid, or gas—is typically the same as that of the solvent. Solute concentrations are often described with qualitative terms such as dilute (of relatively low concentration) and concentrated (of relatively high concentration).
In a solution, the solute particles (molecules, atoms, and/or ions)...
Intermolecular Forces and Physical Properties02:56

Intermolecular Forces and Physical Properties

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Related Experiment Video

Updated: May 23, 2026

Measuring the Interaction Force Between a Droplet and a Super-hydrophobic Substrate by the Optical Lever Method
07:18

Measuring the Interaction Force Between a Droplet and a Super-hydrophobic Substrate by the Optical Lever Method

Published on: June 14, 2019

Forces between hydrophobic solids in concentrated aqueous salt solution.

Dean J Mastropietro1, William A Ducker

  • 1Department of Chemical Engineering, Virginia Tech, Blacksburg, Virginia 24060, USA.

Physical Review Letters
|April 3, 2012
PubMed
Summary

In concentrated salt solutions, van der Waals forces, not hydrophobic forces, dominate interactions between hydrophobic solids beyond 5 nm. This finding simplifies understanding intersurface forces in saline environments.

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Quantitative and Qualitative Examination of Particle-particle Interactions Using Colloidal Probe Nanoscopy
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Last Updated: May 23, 2026

Measuring the Interaction Force Between a Droplet and a Super-hydrophobic Substrate by the Optical Lever Method
07:18

Measuring the Interaction Force Between a Droplet and a Super-hydrophobic Substrate by the Optical Lever Method

Published on: June 14, 2019

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

Area of Science:

  • Physical Chemistry
  • Surface Science
  • Colloid Science

Background:

  • Research has explored long-ranged forces between hydrophobic solids in aqueous solutions.
  • Understanding these forces is crucial for various applications, including nanotechnology and materials science.

Purpose of the Study:

  • To investigate the nature of forces between hydrophobic solids in concentrated salt solutions.
  • To determine if hydrophobic forces are necessary to explain interactions at separations greater than 5 nm in saline environments.

Main Methods:

  • Measurements of forces between octadecyltrichlorosilane-coated glass solids (contact angle 108°) in 1 M KCl solution.
  • Comparison of experimental force data with van der Waals forces calculated using Lifshitz theory.

Main Results:

  • Experimental force measurements closely matched van der Waals forces predicted by Lifshitz theory for separations > 5 nm.
  • The presence of 1 M salt solution minimized electrostatic forces, allowing for clearer observation of van der Waals interactions.

Conclusions:

  • Hydrophobic forces are not required to explain interactions between hydrophobic solids in 1 M salt solution at separations > 5 nm.
  • Van der Waals forces, as described by Lifshitz theory, adequately account for the observed forces in this saline environment.
  • Using salt solutions simplifies the study of intersurface forces by mitigating electrostatic contributions.