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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...
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...
Crystal Field Theory - Octahedral Complexes02:58

Crystal Field Theory - Octahedral Complexes

Crystal Field Theory
To explain the observed behavior of transition metal complexes (such as colors), a model involving electrostatic interactions between the electrons from the ligands and the electrons in the unhybridized d orbitals of the central metal atom has been developed. This electrostatic model is crystal field theory (CFT). It helps to understand, interpret, and predict the colors, magnetic behavior, and some structures of coordination compounds of transition metals.
CFT focuses on...
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: May 25, 2026

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

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Published on: May 20, 2014

Gravitational compression dynamics of charged colloidal crystals.

Masako Murai1, Tohru Okuzono, Masaaki Yamamoto

  • 1Faculty of Pharmaceutical Sciences, Nagoya City University, 3-1 Tanabe, Mizuho, Nagoya, Aichi 467-8603, Japan.

Journal of Colloid and Interface Science
|January 31, 2012
PubMed
Summary

Gravitational force compresses charged colloidal crystals. Researchers monitored these changes using Bragg diffraction and simulations, finding good agreement at high ionic strengths.

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Area of Science:

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

Background:

  • Charged colloidal crystals exhibit complex behaviors influenced by interparticle forces.
  • Gravitational sedimentation is a key factor affecting the structure of colloidal systems.
  • Understanding these forces is crucial for designing advanced materials.

Purpose of the Study:

  • To investigate the compression of charged colloidal crystals under gravitational force.
  • To analyze the spatiotemporal variations in crystal lattice structure.
  • To validate a continuum model against experimental observations.

Main Methods:

  • Utilized Bragg diffraction to monitor crystal lattice changes.
  • Employed in situ fiber optics reflection spectroscopy for sedimentation profiles.
  • Performed numerical simulations with a continuum model including electrostatic interactions.

Main Results:

  • Observed compression of charged colloidal crystals due to gravity.
  • Successfully determined sedimentation profiles along crystal height.
  • Simulation results accurately matched experimental data at high ionic strengths.

Conclusions:

  • Gravitational force significantly impacts charged colloidal crystal compression.
  • The phenomenological continuum model effectively captures crystal behavior.
  • Ionic strength plays a critical role in the accuracy of the model.