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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...
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...
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...
Motion Of A Charged Particle In A Magnetic Field01:22

Motion Of A Charged Particle In A Magnetic Field

A charged particle experiences a force when moving through a magnetic field. Consider the field to be uniform and the charged particle to move perpendicular to it. If the field is in a vacuum, the magnetic field is the dominant factor determining the motion. Since the magnetic force is perpendicular to the direction of motion, a charged particle follows a curved path. The particle continues to follow this curved path until it forms a complete circle. Another way to look at this is that the...

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Related Experiment Video

Updated: Jul 9, 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

Confinement-controlled phase behavior of charged colloids under gravity.

Samuel Lopez-Godoy1, Anna Kozina1

  • 1Instituto de Química, Universidad Nacional Autónoma de México, Mexico City, Mexico.

The Journal of Chemical Physics
|July 8, 2026
PubMed
Summary
This summary is machine-generated.

Charged colloidal suspensions form ordered or disordered structures depending on confinement and screening. Strong confinement and screening favor crystal lattices, while weak confinement leads to fluid phases in these soft-matter systems.

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Area of Science:

  • Soft matter physics
  • Colloidal science
  • Materials science

Background:

  • Charged colloidal suspensions are complex fluids with tunable properties.
  • Gravitational confinement influences particle arrangement in quasi-2D layers.
  • Understanding phase behavior is crucial for designing novel materials.

Purpose of the Study:

  • To investigate the structural transitions of sedimented charged colloidal suspensions under gravitational confinement.
  • To explore the effects of confinement strength and charge screening on colloidal self-assembly.
  • To establish an experimental framework for predicting phase behavior in soft-matter systems.

Main Methods:

  • Utilizing light microscopy to image particle arrangements in sealed sample cells.
  • Systematically varying gravitational Peclet number and dimensionless screening parameter.
  • Analyzing structural development at different initial particle concentrations.

Main Results:

  • Ordered triangular lattices, resembling face-centered cubic planes, form under strong confinement and screening.
  • Disordered fluid phases are observed in systems with weak confinement.
  • A coexistence region of triangular and rhombic phases is identified at intermediate parameters.

Conclusions:

  • The study reveals complex phase behavior in gravitationally confined colloidal systems.
  • Confinement and charge screening are key factors controlling structural transitions.
  • The findings provide insights into predicting and controlling self-assembly in soft matter.