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Related Concept Videos

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...
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...
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)...
Micelles01:30

Micelles

Micelle formation is an intricate process that hinges on the properties of amphiphilic or amphipathic molecules and the conditions of the system in which they are found. Amphiphilic molecules, which have both hydrophilic (water-attracting) and hydrophobic (water-repelling) parts, play a critical role in this process.In aqueous environments, these molecules arrange themselves such that their hydrophilic heads are turned towards the water phase, while their hydrophobic tails are oriented away...
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...
Factors Affecting Dissolution: Particle Size and Effective Surface Area01:23

Factors Affecting Dissolution: Particle Size and Effective Surface Area

Dissolution kinetics, an essential aspect of oral drug delivery, is significantly influenced by the drug's particle size. According to the Noyes-Whitney dissolution model, the dissolution rate correlates directly with the drug's surface area. The larger the surface area, the higher the drug's solubility in water, leading to a faster drug dissolution rate. Reducing particle size increases the effective surface area, enhancing the dissolution process. Micronization and nanosizing are employed to...

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Related Experiment Video

Updated: Jun 4, 2026

Synthesis and Characterization of Supramolecular Colloids
09:26

Synthesis and Characterization of Supramolecular Colloids

Published on: April 22, 2016

Emulsification in binary liquids containing colloidal particles: a structure-factor analysis.

Job H J Thijssen1, Paul S Clegg

  • 1SUPA School of Physics and Astronomy, The University of Edinburgh, Edinburgh EH9 3JZ, UK. j.h.j.thijssen@ed.ac.uk

Journal of Physics. Condensed Matter : an Institute of Physics Journal
|February 23, 2011
PubMed
Summary
This summary is machine-generated.

Researchers developed a new image analysis method to study particle-stabilized emulsions. This method reveals how particle interactions and creaming influence emulsion microstructure and droplet size distribution.

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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

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Synthesis and Characterization of Supramolecular Colloids
09:26

Synthesis and Characterization of Supramolecular Colloids

Published on: April 22, 2016

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

Area of Science:

  • Materials Science
  • Colloid and Surface Science
  • Soft Matter Physics

Background:

  • Particle-stabilized emulsions are crucial in various industries.
  • Understanding their microstructure evolution is key to controlling their properties.
  • Demixing in binary liquids offers a route to forming these emulsions.

Purpose of the Study:

  • To quantitatively study the transient and final microstructure of particle-stabilized emulsions.
  • To develop and validate a novel image-analysis method for microstructure characterization.
  • To elucidate the mechanisms of droplet nucleation, growth, and coarsening.

Main Methods:

  • Quantitative confocal microscopy was employed to capture emulsion dynamics.
  • A new image-analysis technique utilizing structure factors from discrete Fourier transforms was developed.
  • Peak fitting of radially averaged Fourier transforms allowed extraction of dominant length scales.

Main Results:

  • The developed method successfully characterized microstructure from droplet nucleation onwards.
  • Particle-stabilized emulsions exhibited bimodal droplet-size distributions.
  • Coalescence and creaming were identified as primary coarsening mechanisms in later stages.
  • Particle-promoted nucleation and subsequent growth regimes were inferred.

Conclusions:

  • Interfacial particles stabilize the emulsions on experimental timescales.
  • Bimodal droplet size distributions arise from coalescence and creaming.
  • Creaming significantly impacts early-stage droplet growth.
  • Future work can tailor emulsion microstructure by controlling quench conditions.