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Related Concept Videos

The Colloidal State01:29

The Colloidal State

The formation of a colloidal system is exemplified by an aqueous solution containing Cl− ions is introduced to another containing Ag+ ions, resulting in the precipitation of solid AgCl as extremely tiny crystals. Instead of settling out as a filterable precipitate, these crystals remain suspended in the liquid, showcasing a colloidal system.A colloidal system involves colloidal particles within the approximate range of 1 to 1000 nm in at least one dimension, dispersed in a medium called the...
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...
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.
Colloids03:22

Colloids

Children at play often make suspensions such as mixtures of mud and water, flour and water, or a suspension of solid pigments in water known as tempera paint. These suspensions are heterogeneous mixtures composed of relatively large particles that are visible to the naked eye or can be seen with a magnifying glass. They are cloudy, and the suspended particles settle out after mixing. On the other hand, a solution is a homogeneous mixture in which no settling occurs and in which the dissolved...
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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The Preparation of Electrohydrodynamic Bridges from Polar Dielectric Liquids
10:03

The Preparation of Electrohydrodynamic Bridges from Polar Dielectric Liquids

Published on: September 30, 2014

The bridging force between colloidal particles in a polyelectrolyte solution.

Haohao Huang1, Eli Ruckenstein

  • 1School of Materials Science and Engineering, South China University of Technology, Guangzhou 510640, China. hhhuang@scut.edu.cn

Langmuir : the ACS Journal of Surfaces and Colloids
|November 9, 2012
PubMed
Summary
This summary is machine-generated.

A new theory explains polyelectrolyte bridging forces in colloidal dispersions. It considers interfacial tension, revealing how surface interactions dictate attractive or repulsive forces between particles.

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Area of Science:

  • Colloid and Surface Science
  • Polymer Physics
  • Physical Chemistry

Background:

  • Polyelectrolytes influence colloidal particle interactions via electrostatic and bridging forces.
  • Existing theories often neglect the contribution of plate-solution interfacial tension to free energy.

Purpose of the Study:

  • Develop a simple theory to calculate bridging forces between colloidal particles and plates.
  • Incorporate plate-solution interfacial tension into the free energy calculation.

Main Methods:

  • Utilized a self-consistent field approach.
  • Developed a theoretical framework to calculate bridging forces.
  • Accounted for the contribution of plate-solution interfacial tension to free energy.

Main Results:

  • Bridging force is sensitive to surface-segment interactions; repulsive interactions yield weak forces due to low polyelectrolyte adsorption.
  • Attractive interactions lead to diverse segment concentration profiles.
  • Combined electrostatic and bridging forces can be attractive or repulsive, depending on polyelectrolyte concentration.
  • Attractive bridging force between plates exhibits longer range than van der Waals interactions.

Conclusions:

  • The developed theory provides a method to calculate bridging forces, considering interfacial tension.
  • Surface-segment interactions significantly impact polyelectrolyte adsorption and bridging force.
  • Polyelectrolyte concentration and surface interactions collectively determine the net force between colloidal entities.