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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...
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...
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...
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: Jun 26, 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

Interfacial structuring in a phase-separating mixed biopolymer solution containing colloidal particles.

Hassan Firoozmand1, Brent S Murray, Eric Dickinson

  • 1Procter Department of Food Science, University of Leeds, Leeds LS2 9JT, UK.

Langmuir : the ACS Journal of Surfaces and Colloids
|January 14, 2009
PubMed
Summary
This summary is machine-generated.

Colloidal particles in biopolymer mixtures accumulate at interfaces, affecting microstructure coarsening. This suggests a viscoelastic liquid-liquid boundary in the phase-separating system.

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Interfacial Molecular-level Structures of Polymers and Biomacromolecules Revealed via Sum Frequency Generation Vibrational Spectroscopy
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Interfacial Molecular-level Structures of Polymers and Biomacromolecules Revealed via Sum Frequency Generation Vibrational Spectroscopy

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Phase Behavior of Charged Vesicles Under Symmetric and Asymmetric Solution Conditions Monitored with Fluorescence Microscopy
10:08

Phase Behavior of Charged Vesicles Under Symmetric and Asymmetric Solution Conditions Monitored with Fluorescence Microscopy

Published on: October 24, 2017

Related Experiment Videos

Last Updated: Jun 26, 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

Interfacial Molecular-level Structures of Polymers and Biomacromolecules Revealed via Sum Frequency Generation Vibrational Spectroscopy
09:43

Interfacial Molecular-level Structures of Polymers and Biomacromolecules Revealed via Sum Frequency Generation Vibrational Spectroscopy

Published on: August 13, 2019

Phase Behavior of Charged Vesicles Under Symmetric and Asymmetric Solution Conditions Monitored with Fluorescence Microscopy
10:08

Phase Behavior of Charged Vesicles Under Symmetric and Asymmetric Solution Conditions Monitored with Fluorescence Microscopy

Published on: October 24, 2017

Area of Science:

  • Colloid and interface science
  • Biopolymer phase separation
  • Materials science

Background:

  • Understanding colloidal particle behavior in complex fluids is crucial for material design.
  • Biopolymer mixtures, like gelatin and oxidized starch, exhibit spinodal phase separation, forming intricate microstructures.
  • The role of additives in modulating phase separation dynamics is an active research area.

Purpose of the Study:

  • To investigate the spatial distribution of colloidal particles within a phase-separating biopolymer system.
  • To determine how these particles influence the coarsening kinetics of the bicontinuous microstructure.
  • To probe the viscoelastic properties of the liquid-liquid interface.

Main Methods:

  • Confocal microscopy was employed to observe the spatial distribution of amphoteric polystyrene latex particles.
  • Samples were prepared by incorporating monodisperse colloidal particles into a gelatin-oxidized starch mixture.
  • Microscopy was performed on aged samples at 40°C to capture the evolving microstructure.

Main Results:

  • Confocal microscopy revealed a strong tendency for colloidal particles to accumulate at the liquid-liquid interface.
  • Particle accumulation significantly influenced the rate of coarsening of the bicontinuous microstructure.
  • Observed variations in local curvature of particle-rich regions indicated a viscoelastic liquid-liquid boundary.

Conclusions:

  • Amphoteric polystyrene latex particles preferentially segregate to the interface in biopolymer mixtures.
  • These particles act as modifiers, altering the dynamics of phase separation and microstructure evolution.
  • The interfacial behavior suggests a complex, viscoelastic nature of the boundary between the separating biopolymer phases.