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Related Concept Videos

The Colloidal State01:29

The Colloidal State

184
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...
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Colloids and Suspensions01:17

Colloids and Suspensions

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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...
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Colloids03:22

Colloids

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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...
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Colloidal precipitates01:09

Colloidal precipitates

5.7K
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...
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Coagulation01:06

Coagulation

1.5K
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...
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Solubility03:00

Solubility

16.9K
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,...
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Updated: May 1, 2026

Confocal Imaging of Confined Quiescent and Flowing Colloid-polymer Mixtures
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Confocal Imaging of Confined Quiescent and Flowing Colloid-polymer Mixtures

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Colloidal aggregation and dynamics in anisotropic fluids.

Frédéric Mondiot1, Robert Botet, Patrick Snabre

  • 1Université de Bordeaux, Centre National de la Recherche Scientifique, Centre de Recherche Paul Pascal, F-33600 Pessac, France.

Proceedings of the National Academy of Sciences of the United States of America
|April 10, 2014
PubMed
Summary
This summary is machine-generated.

Particle size dictates aggregation in nematic micellar solutions. Larger particles form clusters via elastic forces, while smaller particles form chains due to Brownian motion and depletion interactions.

Keywords:
colloidal dispersionelasticityliquid crystal

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Area of Science:

  • Colloid Science
  • Soft Matter Physics
  • Materials Science

Background:

  • Nematic micellar solutions exhibit complex phase behaviors.
  • Submicrometer-sized particles interact via various colloidal forces.
  • Understanding particle aggregation is crucial for material design.

Purpose of the Study:

  • Investigate the collective behavior and aggregation of submicrometer particles in nematic micellar solutions.
  • Determine the influence of particle size on aggregate morphology.
  • Elucidate the dominant forces governing aggregation in different size regimes.

Main Methods:

  • Experimental studies using latex spheres (190-780 nm diameter).
  • Numerical simulations employing a modified diffusion-limited cluster aggregation model.
  • Analysis of aggregate morphology and formation timescales.

Main Results:

  • Two distinct aggregation regimes observed based on particle size.
  • Larger particles (190-780 nm) form compact or V-like clusters driven by elastic interactions.
  • Smaller particles form chains along the nematic axis, dominated by Brownian motion and depletion forces.

Conclusions:

  • Particle size is a critical factor controlling aggregation in nematic micellar systems.
  • The transition from elastic interaction dominance to Brownian motion/depletion dominance occurs with decreasing particle size.
  • Results highlight the significance of suboptical-scale diffusion in colloidal systems.