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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...
Colloidal precipitates01:09

Colloidal precipitates

The high insolubility of some precipitates can result in an unfavorable relative supersaturation. This can lead to colloidal particles with a large surface-to-mass ratio, where adsorption is promoted. For instance, in the precipitation of silver chloride, silver ions are adsorbed on the surface of the colloidal particles, forming a primary layer. This layer attracts ions of opposite charge (such as nitrate ions), forming a diffuse secondary layer of adsorbed ions. This electric double layer...
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,...
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...
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...

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Related Experiment Video

Updated: Jun 22, 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

Attractive electrostatic forces between identical colloidal particles induced by adsorbed polyelectrolytes.

Ionel Popa, Graeme Gillies, Georg Papastavrou

    The Journal of Physical Chemistry. B
    |June 19, 2009
    PubMed
    Summary

    Polyelectrolytes near the isoelectric point cause attractive forces between particles. These forces, measured by atomic force microscopy, stem from electrostatic patch-charge interactions, impacting various surfaces.

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    Published on: July 18, 2014

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    Published on: July 28, 2008

    Area of Science:

    • Colloid and Surface Science
    • Physical Chemistry
    • Biophysics

    Background:

    • Polyelectrolytes significantly alter surface interactions due to strong adsorption onto oppositely charged surfaces.
    • Understanding these forces is crucial for controlling colloidal systems and interfacial phenomena.

    Discussion:

    • Direct force measurements using atomic force microscopy (AFM) were performed on individual particles in aqueous suspension.
    • Systematic variations in molecular mass and ionic strength elucidated the nature of the observed forces.

    Key Insights:

    • Attractive forces between particles in the presence of polyelectrolytes near the isoelectric point are primarily attributed to electrostatic patch-charge interactions.
    • These patch-charge interactions are a fundamental mechanism influencing interactions across diverse interfaces.

    Outlook:

    • The findings provide a deeper understanding of electrostatic interactions in complex fluid systems.
    • This knowledge can be applied to tailor interactions at protein, hydrophobic, and mineral surfaces for various applications.