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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...
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...
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...
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...
Coagulation01:06

Coagulation

Colloidal solids are solid particles suspended in solution. They are usually negatively charged, attracting a compact primary layer of positively charged ions, which attract more counterions to form an electrical double layer. Electrostatic repulsion between the charged double layers prevents the particles from colliding, stabilizing the colloids. These solids are often undesirable because they can contain toxins that are difficult to remove. Coagulation is a technique that helps aggregate and...
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: May 12, 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

Dense colloidal fluids form denser amorphous sediments.

Shir R Liber1, Shai Borohovich, Alexander V Butenko

  • 1Physics Department, Bar-Ilan University, Ramat-Gan 52900, Israel.

Proceedings of the National Academy of Sciences of the United States of America
|March 27, 2013
PubMed
Summary
This summary is machine-generated.

Colloidal hard sphere fluids form sediments with densities corresponding to random loose packing (0.55) or random close packing (0.64), depending on the initial fluid concentration. Sediment density directly correlates with initial suspension volume fraction, independent of sedimentation rate when crystallization is avoided.

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Combined Size and Density Fractionation of Soils for Investigations of Organo-Mineral Interactions
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Combined Size and Density Fractionation of Soils for Investigations of Organo-Mineral Interactions

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Synthesis and Characterization of Supramolecular Colloids
09:26

Synthesis and Characterization of Supramolecular Colloids

Published on: April 22, 2016

Related Experiment Videos

Last Updated: May 12, 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

Combined Size and Density Fractionation of Soils for Investigations of Organo-Mineral Interactions
08:38

Combined Size and Density Fractionation of Soils for Investigations of Organo-Mineral Interactions

Published on: February 15, 2019

Synthesis and Characterization of Supramolecular Colloids
09:26

Synthesis and Characterization of Supramolecular Colloids

Published on: April 22, 2016

Area of Science:

  • Colloid and Surface Science
  • Materials Science
  • Statistical Mechanics

Background:

  • Colloidal suspensions are ubiquitous in nature and industry.
  • Understanding the packing density of sediments formed from these suspensions is crucial for predicting material properties.
  • Existing models often struggle to reconcile fluid structure with sediment properties under rapid sedimentation conditions.

Purpose of the Study:

  • To experimentally determine the relationship between the density of colloidal fluids and the packing characteristics of their resulting sediments.
  • To investigate the influence of initial particle concentration on sediment density.
  • To validate findings using computational simulations.

Main Methods:

  • Analytical centrifugation experiments on colloidal hard sphere fluids.
  • Varying the volume fraction of initial colloidal suspensions.
  • Computer simulations to model particle packing and sedimentation dynamics.
  • Ensuring rapid sedimentation to prevent crystallization.

Main Results:

  • Dilute colloidal fluids form loosely packed sediments near the random loose packing limit (ϕRLP = 0.55).
  • Dense colloidal fluids form denser sediments approaching the random close packing limit (ϕRCP = 0.64).
  • Sediment density shows a monotonic relationship with the initial suspension's volume fraction.

Conclusions:

  • The packing density of sediments from colloidal hard sphere fluids is dictated by the initial fluid's volume fraction.
  • In systems dominated by viscous forces and with suppressed crystallization, sediment structure reflects the initial fluid's equilibrium structure.
  • This provides a predictive framework for sediment properties based on initial suspension characteristics.