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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...
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...
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...

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Related Experiment Video

Updated: Jun 8, 2026

Synthesis and Characterization of Supramolecular Colloids
09:26

Synthesis and Characterization of Supramolecular Colloids

Published on: April 22, 2016

Experimental study of random-close-packed colloidal particles.

Rei Kurita1, Eric R Weeks

  • 1Department of Physics, Emory University, Atlanta, Georgia 30322, USA.

Physical Review. E, Statistical, Nonlinear, and Soft Matter Physics
|September 28, 2010
PubMed
Summary
This summary is machine-generated.

Random close packing (RCP) describes tightly packed spheres. This study used confocal microscopy to analyze over 450,000 colloidal particles, revealing tiny crystallites and long wavelength density fluctuations in experimental RCP systems.

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Area of Science:

  • Physics
  • Materials Science
  • Soft Matter

Background:

  • Random close packing (RCP) models amorphous structures in liquids, glasses, and granular materials.
  • Understanding RCP is crucial for diverse scientific and engineering applications.

Purpose of the Study:

  • To investigate the structural properties of experimentally realized random close packing using colloidal particles.
  • To analyze particle arrangements and density fluctuations in a large-volume RCP system.

Main Methods:

  • Utilized confocal microscopy to image over 450,000 colloidal particles.
  • Achieved high spatial resolution (better than 0.02 particle diameters) for precise particle positioning.
  • Analyzed the structure factor at long length scales.

Main Results:

  • Observed that while particles largely satisfy random packing criteria, a small fraction (<3%) consists of tiny crystallites (≤4 particles).
  • Identified locally higher densities associated with these crystallites.
  • Measured a non-zero structure factor at long length scales (S(0)=0.049±0.008), indicating long wavelength density fluctuations.

Conclusions:

  • Experimental RCP systems may differ from simulated models due to the presence of long wavelength density fluctuations.
  • These fluctuations could arise from polydispersity or the observed tiny crystallites.
  • The findings provide new insights into the nature of amorphous packing in condensed matter.