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Related Concept Videos

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...
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...
Phase Transitions: Melting and Freezing02:39

Phase Transitions: Melting and Freezing

Heating a crystalline solid increases the average energy of its atoms, molecules, or ions, and the solid gets hotter. At some point, the added energy becomes large enough to partially overcome the forces holding the molecules or ions of the solid in their fixed positions, and the solid begins the process of transitioning to the liquid state or melting. At this point, the temperature of the solid stops rising, despite the continual input of heat, and it remains constant until all of the solid is...
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...
Phase Transitions: Vaporization and Condensation02:39

Phase Transitions: Vaporization and Condensation

The physical form of a substance changes on changing its temperature. For example, raising the temperature of a liquid causes the liquid to vaporize (convert into vapor). The process is called vaporization—a surface phenomenon. Vaporization occurs when the thermal motion of the molecules overcome the intermolecular forces, and the molecules (at the surface) escape into the gaseous state. When a liquid vaporizes in a closed container, gas molecules cannot escape. As these gas phase molecules...

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

Published on: May 20, 2014

Colloidal glass transition observed in confinement.

Carolyn R Nugent1, Kazem V Edmond, Hetal N Patel

  • 1Physics Department, Emory University, Atlanta, Georgia 30322, USA.

Physical Review Letters
|August 7, 2007
PubMed
Summary

Confined colloidal suspensions exhibit glassy behavior due to slower particle motion. Confinement effects appear at larger scales in denser samples nearing the glass transition.

Area of Science:

  • Colloidal science
  • Soft matter physics
  • Materials science

Background:

  • Glass transitions are fundamental in condensed matter physics.
  • Understanding particle dynamics in confined systems is crucial for materials design.
  • Colloidal suspensions offer a model system to study complex phenomena like glass transitions.

Purpose of the Study:

  • To investigate glass transitions in colloidal suspensions confined between quasiparallel walls.
  • To model the effects of geometric confinement on particle dynamics and phase behavior.
  • To explore how particle size mixture and volume fraction influence confinement effects.

Main Methods:

  • Utilizing a colloidal suspension composed of two particle sizes to inhibit crystallization.
  • Employing confocal microscopy for direct observation of colloidal particle motion.

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Cooling Rate Dependent Ellipsometry Measurements to Determine the Dynamics of Thin Glassy Films
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Cooling Rate Dependent Ellipsometry Measurements to Determine the Dynamics of Thin Glassy Films

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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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Methods of Ex Situ and In Situ Investigations of Structural Transformations: The Case of Crystallization of Metallic Glasses
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Methods of Ex Situ and In Situ Investigations of Structural Transformations: The Case of Crystallization of Metallic Glasses

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  • Analyzing particle dynamics under varying degrees of confinement and volume fractions.

    • Main Results:

    • Observed slower particle motion in confined colloidal suspensions compared to bulk liquids.
    • Demonstrated that confinement induces glassy behavior in a system that is otherwise a liquid.
    • Found that confinement effects manifest at larger length scales in denser samples closer to the glass transition.

    Conclusions:

    • Geometric confinement plays a significant role in inducing and modifying glass transitions in colloidal systems.
    • The interplay between confinement, particle interactions, and volume fraction dictates the emergence of glassy dynamics.
    • This study provides insights into designing materials with tailored properties in confined environments.