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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...
Colloids and Suspensions01:17

Colloids and Suspensions

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 visible to the naked eye or seen with a magnifying glass. They are cloudy, and the suspended particles settle out after mixing. The suspended particles in a suspension settle out after some time of mixing. The separation of particles from a suspension is...
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...
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...
First Law: Particles in Two-dimensional Equilibrium01:18

First Law: Particles in Two-dimensional Equilibrium

Recall that a particle in equilibrium is one for which the external forces are balanced. Static equilibrium involves objects at rest, and dynamic equilibrium involves objects in motion without acceleration; but it is important to remember that these conditions are relative. For instance, an object may be at rest when viewed from one frame of reference, but that same object would appear to be in motion when viewed by someone moving at a constant velocity.
Newton's first law tells us about the...
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)...

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Related Experiment Video

Updated: Jul 4, 2026

Confocal Imaging of Confined Quiescent and Flowing Colloid-polymer Mixtures
10:56

Confocal Imaging of Confined Quiescent and Flowing Colloid-polymer Mixtures

Published on: May 20, 2014

Surviving structure in colloidal suspensions squeezed from 3D to 2D.

Sabine H L Klapp1, Yan Zeng, Dan Qu

  • 1Institut für Theoretische Physik, Sekr. PN 7-1, Technische Universität Berlin, Hardenbergstrasse 36, D-10623 Berlin, Germany.

Physical Review Letters
|June 4, 2008
PubMed
Summary
This summary is machine-generated.

We found that the structural wavelength of silica colloids in bulk liquid matches their behavior in thin films. This provides direct experimental and simulation evidence of coinciding structural wavelengths under confinement.

More Related Videos

Synthesis and Characterization of Supramolecular Colloids
09:26

Synthesis and Characterization of Supramolecular Colloids

Published on: April 22, 2016

Related Experiment Videos

Last Updated: Jul 4, 2026

Confocal Imaging of Confined Quiescent and Flowing Colloid-polymer Mixtures
10:56

Confocal Imaging of Confined Quiescent and Flowing Colloid-polymer Mixtures

Published on: May 20, 2014

Synthesis and Characterization of Supramolecular Colloids
09:26

Synthesis and Characterization of Supramolecular Colloids

Published on: April 22, 2016

Area of Science:

  • Colloid science
  • Physical chemistry
  • Materials science

Background:

  • Understanding solvation forces is crucial for predicting colloidal behavior in confined geometries.
  • Charged silica colloids exhibit complex interactions within thin films.

Purpose of the Study:

  • To investigate solvation forces (F) of charged silica colloids in thin films of varying thickness (h).
  • To determine the relationship between bulk liquid structure and confined colloid behavior.
  • To provide direct experimental and simulation evidence for theoretical predictions.

Main Methods:

  • Utilizing colloidal-probe experiments to measure solvation forces.
  • Employing computer simulations to model colloid-film interactions.
  • Analyzing the radial distribution function of the bulk liquid.

Main Results:

  • Oscillations in solvation forces (F) for larger film thicknesses (h) correlate with the bulk radial distribution function's dominant wavelength.
  • Both solvation forces and bulk structure show identical power-law density dependence.
  • Demonstrated coincidence of structural wavelengths in bulk and confined systems.

Conclusions:

  • This study provides the first direct evidence of coinciding structural wavelengths in bulk and confined charged silica colloid systems.
  • Experimental and theoretical data show excellent quantitative agreement, validating density functional theory predictions.
  • Findings enhance understanding of colloidal behavior in nanoconfined environments.