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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...
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...
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...
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...

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Related Experiment Video

Updated: May 28, 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

Interactions between colloids induced by a soft cross-linked polymer substrate.

Lorenzo Di Michele1, Taiki Yanagishima, Anthony R Brewer

  • 1Biological and Soft Systems, Cavendish Laboratory, University of Cambridge, United Kingdom.

Physical Review Letters
|October 27, 2011
PubMed
Summary
This summary is machine-generated.

Heavy silica colloids attract each other on soft polymer gels, forming large aggregates. This attraction can be controlled by adjusting gel stiffness or colloid coatings, revealing a colloid-surface interaction.

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Related Experiment Videos

Last Updated: May 28, 2026

Confocal Imaging of Confined Quiescent and Flowing Colloid-polymer Mixtures
10:56

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Published on: May 20, 2014

Synthesis and Characterization of Supramolecular Colloids
09:26

Synthesis and Characterization of Supramolecular Colloids

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Fabricating Reactive Surfaces with Brush-like and Crosslinked Films of Azlactone-Functionalized Block Co-Polymers
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Fabricating Reactive Surfaces with Brush-like and Crosslinked Films of Azlactone-Functionalized Block Co-Polymers

Published on: June 30, 2018

Area of Science:

  • Soft matter physics
  • Colloid science
  • Polymer science

Background:

  • Colloidal systems exhibit complex interactions.
  • Understanding particle behavior on soft surfaces is crucial for material design.

Purpose of the Study:

  • To demonstrate and characterize short-ranged attractions between heavy silica colloids on polymer gels.
  • To investigate the influence of gel stiffness and colloid surface modification on these interactions.

Main Methods:

  • Videomicroscopy imaging was employed to observe colloid diffusion and interactions.
  • Varying gel stiffness and colloid surface coatings were used to tune intercolloid potentials.

Main Results:

  • A short-ranged equilibrium attraction between silica colloids on soft polymer gels was observed.
  • The intercolloid potential was tunable via gel stiffness and colloid surface modification.
  • Large-scale colloidal aggregation occurred on sufficiently soft substrates due to polymer matrix interactions.

Conclusions:

  • The study confirms colloid-surface attraction as the driving force for observed in-plane interactions.
  • Findings suggest that soft polymer gels can induce significant colloidal aggregation.
  • The tunable nature of these interactions opens possibilities for controlled colloidal assembly.