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Related Concept Videos

The Colloidal State01:29

The Colloidal State

91
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...
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Colloids03:22

Colloids

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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...
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Colloids and Suspensions01:17

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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...
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Colloidal precipitates01:09

Colloidal precipitates

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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: Mar 21, 2026

Controlled Synthesis and Fluorescence Tracking of Highly Uniform PolyN-isopropylacrylamide Microgels
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Controlled Synthesis and Fluorescence Tracking of Highly Uniform PolyN-isopropylacrylamide Microgels

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Microstructure of polydisperse colloidal gels.

Benjamin F Lonial1, Eric R Weeks1

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

Physical Review. E
|March 20, 2026
PubMed
Summary
This summary is machine-generated.

Large particles in colloidal gels provide structural rigidity. Their distribution influences gel formation and stability, impacting overall material properties.

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Area of Science:

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

Background:

  • Colloidal gels are complex materials formed by aggregating particles.
  • Understanding particle interactions and size distributions is crucial for controlling gel properties.
  • The van der Waals force drives spontaneous aggregation in these systems.

Purpose of the Study:

  • To investigate the role of particle size distribution in the formation and structure of colloidal gels.
  • To analyze the relationship between particle size, nearest-neighbor pairings, and emergent structural motifs.
  • To explore how particle size heterogeneity influences gel rigidity and stability.

Main Methods:

  • Confocal microscopy was employed to image colloidal gels.
  • Gels were formed from highly polydisperse particles suspended in a density-matched solvent.
  • Particle size distribution was analyzed, and nearest-neighbor interactions were quantified.

Main Results:

  • Particle pairing was consistent with random association based on size distribution.
  • Larger particles exhibited a higher number of nearest neighbors.
  • An over-representation of large particles was observed in tetrahedral structures, enhancing gel rigidity.

Conclusions:

  • Large particles significantly contribute to the rigidity of colloidal gels.
  • The observed tetrahedral structures suggest particle rearrangement during gelation.
  • Particle size distribution is a key factor in determining colloidal gel architecture and mechanical properties.