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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...
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)...
Van der Waals Interactions01:24

Van der Waals Interactions

Atoms and molecules interact with each other through intermolecular forces. These electrostatic forces arise from attractive or repulsive interactions between particles with permanent, partial, or temporary charges. The intermolecular forces between neutral atoms and molecules are ion–dipole, dipole–dipole, and dispersion forces, collectively known as van der Waals forces.Polar molecules have a partial positive charge on one end and a partial negative charge on the other end of the molecule,...

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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

Low-density ordered phase in brownian dipolar colloidal suspensions.

Amit K Agarwal1, Anand Yethiraj

  • 1Department of Physics and Physical Oceanography, Memorial University, St. John's, Newfoundland and Labrador, A1B 3X7, Canada. amit@mun.ca

Physical Review Letters
|June 13, 2009
PubMed
Summary
This summary is machine-generated.

We discovered a new stable phase in colloidal suspensions under an electric field, forming a cellular network of particles with empty voids. This structure is an equilibrium thermodynamic phase, influenced by sample thickness.

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Area of Science:

  • Colloidal science
  • Soft matter physics
  • Materials science

Background:

  • Brownian colloidal suspensions are fundamental systems in soft matter.
  • Understanding their phase behavior under external fields is crucial for materials design.
  • Previous studies have explored various field-induced structures.

Purpose of the Study:

  • To investigate the phase behavior of Brownian colloidal suspensions under a uniform AC electric field.
  • To characterize a novel aggregated phase observed in low volume fraction systems.
  • To determine the thermodynamic stability and scaling properties of this new phase.

Main Methods:

  • Experimental study of colloidal suspensions.
  • Application of a uniform AC electric field.
  • Microscopy and long-time observation of particle aggregation and network formation.

Main Results:

  • A novel, stable cellular network phase was observed.
  • This phase consists of particle-rich walls surrounding particle-free voids.
  • The cell-cell spacing scales with sample thickness, not concentration, indicating an equilibrium thermodynamic phase.
  • The structure is stable over long observation times.

Conclusions:

  • The observed cellular network represents a new equilibrium thermodynamic phase in colloidal suspensions.
  • The formation of this phase requires a balance of long-range repulsions and short-range attractions.
  • The scaling behavior suggests confinement effects play a significant role in the structure's morphology.