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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...
Theories of Dissolution: The Danckwerts' Model and Interfacial Barrier Model01:09

Theories of Dissolution: The Danckwerts' Model and Interfacial Barrier Model

Various dissolution theories provide insight into the factors that influence the dissolution rate. Danckwerts' Model suggests that turbulence, rather than a stagnant layer, characterizes the dissolution medium at the solid-liquid interface. In this model, the agitated solvent contains macroscopic packets that move to the interface via eddy currents, facilitating the absorption and delivery of the drug to the bulk solution. The regular replenishment of solvent packets maintains the concentration...
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...
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 19, 2026

Synthesis and Characterization of Supramolecular Colloids
09:26

Synthesis and Characterization of Supramolecular Colloids

Published on: April 22, 2016

Solvent mediated interactions between model colloids and interfaces: a microscopic approach.

Paul Hopkins1, Andrew J Archer, Robert Evans

  • 1H. H. Wills Physics Laboratory, University of Bristol, Tyndall Avenue, Bristol BS8 1TL, United Kingdom. paul.hopkins@bristol.ac.uk

The Journal of Chemical Physics
|October 2, 2009
PubMed
Summary
This summary is machine-generated.

We investigated how solvent-mediated potentials influence colloidal systems near phase separation. Adsorbed films around colloids can bridge, causing attractive forces and discontinuities in effective potentials.

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Synthesis and Characterization of Supramolecular Colloids
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Area of Science:

  • Colloid and interface science
  • Statistical mechanics
  • Soft matter physics

Background:

  • Understanding effective potentials is crucial for colloidal systems.
  • Binary solvents exhibiting fluid-fluid phase separation present complex interactions.
  • Solvent-mediated (SM) potentials govern nanoparticle behavior in such environments.

Purpose of the Study:

  • To determine the solvent-mediated contribution to effective potentials for model colloids in a phase-separating binary solvent.
  • To investigate SM potentials between two colloids, a colloid and an interface, and a colloid and a wall.
  • To analyze the impact of colloid-solvent interactions and adsorbed films on SM potentials.

Main Methods:

  • Utilizing a simple density functional theory.
  • Calculating solvent species density profiles around colloidal particles treated as external potentials.
  • Determining SM potentials for various colloid-interface and colloid-colloid configurations.

Main Results:

  • Colloids preferring a specific solvent phase can induce thick adsorbed wetting films.
  • Bridging transitions occur when adsorbed films connect, leading to attractive SM potentials and discontinuous forces.
  • Interface distortion near a planar interface strongly depends on colloid-solvent interactions, with potential discontinuities in SM forces.

Conclusions:

  • Adsorbed films significantly alter SM potentials in phase-separating binary solvents.
  • Bridging phenomena and discontinuities in SM forces are key features driven by colloid-specific interactions.
  • Density functional theory provides insights into colloid behavior near interfaces and in bulk phases.