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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...
Dynamic Equilibrium02:20

Dynamic Equilibrium

A reversible chemical reaction represents a chemical process that proceeds in both forward (left to right) and reverse (right to left) directions. When the rates of the forward and reverse reactions are equal, the concentrations of the reactant and product species remain constant over time and the system is at equilibrium. A special double arrow is used to emphasize the reversible nature of the reaction. The relative concentrations of reactants and products in equilibrium systems vary greatly;...
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...
Types of Damping01:20

Types of Damping

If the amount of damping in a system is gradually increased, the period and frequency start to become affected because damping opposes, and hence slows, the back and forth motion (the net force is smaller in both directions). If there is a very large amount of damping, the system does not even oscillate; instead, it slowly moves toward equilibrium. In brief, an overdamped system moves slowly towards equilibrium, whereas an underdamped system moves quickly to equilibrium but will oscillate about...

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Related Experiment Video

Updated: Jun 3, 2026

The Mechanics of (Poro-)Elastic Contractile Actomyosin Networks As a Model System of the Cell Cytoskeleton
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Highly nonlinear dynamics in a slowly sedimenting colloidal gel.

G Brambilla1, S Buzzaccaro, R Piazza

  • 1Université Montpellier 2, Laboratoire Charles Coulomb UMR 5221, F-34095, Montpellier, France.

Physical Review Letters
|April 8, 2011
PubMed
Summary

Investigating attractive colloidal suspensions under gravity, this study reveals that gel settling is governed by strain rate. Microscopic dynamics scale with this rate, indicating macroscopic deformation drives gel restructuring.

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Area of Science:

  • Colloid and Surface Science
  • Soft Matter Physics
  • Rheology

Background:

  • Attractive colloidal suspensions form gels under gravitational stress.
  • Understanding gel behavior under stress is crucial for material science applications.
  • Previous studies lacked detailed insights into the interplay between macroscopic deformation and microscopic dynamics.

Purpose of the Study:

  • To investigate the behavior of attractive colloidal suspensions under gravitational stress.
  • To analyze concentration, velocity, and microscopic dynamics during compression.
  • To elucidate the relationship between macroscopic deformation and microscopic restructuring in colloidal gels.

Main Methods:

  • Utilizing original light scattering techniques and specialized optical particles.
  • Monitoring concentration and velocity profiles over time.
  • Analyzing microscopic dynamics and their scaling properties.

Main Results:

  • Sedimentation velocity increases nearly linearly with height during compression.
  • Gel settling can be described by a time-dependent strain rate.
  • Microscopic dynamics exhibit scaling properties when normalized by the strain rate.

Conclusions:

  • Macroscopic deformation, quantified by strain rate, is the primary driver of microscopic restructuring in colloidal gels.
  • The observed scaling behavior provides a unified framework for understanding gel dynamics.
  • These findings offer new perspectives on the rheological properties of attractive colloidal systems.