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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...
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...
Coagulation01:06

Coagulation

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...
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...
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...
Intermolecular Forces in Solutions02:28

Intermolecular Forces in Solutions

The formation of a solution is an example of a spontaneous process, a process that occurs under specified conditions without energy from some external source.
When the strengths of the intermolecular forces of attraction between solute and solvent species in a solution are no different than those present in the separated components, the solution is formed with no accompanying energy change. Such a solution is called an ideal solution. A mixture of ideal gases (or gases such as helium and argon,...

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Updated: Jun 12, 2026

Synthesis and Characterization of Supramolecular Colloids
09:26

Synthesis and Characterization of Supramolecular Colloids

Published on: April 22, 2016

Composite colloidal assembly by critical Casimir forces.

T E Kodger1,2, N Farahmand Bafi3, M Labbé-Laurent4

  • 1Van der Waals - Zeeman Institute of Physics, University of Amsterdam, Science Park 904, Amsterdam, The Netherlands.

The Journal of Chemical Physics
|June 11, 2026
PubMed
Summary
This summary is machine-generated.

Colloidal mixtures in binary solvents exhibit complex crystallization due to tunable critical Casimir interactions. This effect mimics atomic alloy behavior and allows control over microstructure annealing.

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Area of Science:

  • Colloid and Interface Science
  • Soft Matter Physics
  • Materials Chemistry

Background:

  • Binary solvent systems near critical composition exhibit unique phase behavior.
  • Critical Casimir effect describes fluid-mediated forces between surfaces in critical fluids.
  • Colloidal particle surface chemistry dictates solvent affinity and interaction specificity.

Purpose of the Study:

  • Investigate phase behavior of binary colloidal mixtures.
  • Explore population-specific fluid-mediated interactions via critical Casimir effect.
  • Analyze complex crystallization and microstructure annealing in colloidal systems.

Main Methods:

  • Dispersing two colloidal particle populations in a binary solvent near critical composition.
  • Chemically modifying particle surfaces to tune solvent affinity.
  • Utilizing temperature-dependent critical Casimir interactions to control phase behavior.

Main Results:

  • Observed complex crystallization in colloidal mixtures, analogous to atomic alloys.
  • Demonstrated particle population-specific critical Casimir interactions.
  • Showcased temperature-dependent and reversible control over phase diagrams and microstructure annealing.

Conclusions:

  • Tunable critical Casimir interactions enable complex phase behavior in colloidal mixtures.
  • Colloidal crystallization can be controlled and annealed similarly to atomic alloys.
  • This approach offers novel pathways for designing and processing soft matter materials.