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The Colloidal State

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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...

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Related Experiment Video

Updated: Jun 22, 2026

Confocal Imaging of Confined Quiescent and Flowing Colloid-polymer Mixtures

Confocal Imaging of Confined Quiescent and Flowing Colloid-polymer Mixtures

Published on: May 20, 2014

Aggregation kinetics of coalescing polymer colloids.

Cornelius Gauer¹, Zichen Jia, Hua Wu

¹Institute for Chemical and Bioengineering, Department of Chemistry and Applied Biosciences, ETH Zurich, 8093 Zurich, Switzerland.

Langmuir : the ACS Journal of Surfaces and Colloids

|June 5, 2009

Summary

Soft colloidal particles rapidly coalesce during aggregation, altering their stability. This study reveals fast coalescence is key to understanding their dynamic behavior.

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Synthesis and Characterization of Supramolecular Colloids

Synthesis and Characterization of Supramolecular Colloids

Published on: April 22, 2016

Area of Science:

Colloid and Surface Science
Soft Matter Physics
Materials Science

Background:

Soft colloidal systems exhibit complex aggregation dynamics.
Understanding particle coalescence is crucial for predicting system stability.
Low glass transition temperature (T(g)) influences particle interactions.

Purpose of the Study:

Investigate the aggregation behavior of a soft, rubbery colloidal system.
Characterize the role of particle coalescence in aggregation kinetics.
Model the colloidal stability changes during aggregation.

Main Methods:

Light scattering techniques to measure average gyration (Rg) and hydrodynamic radii (Rh).
Cryogenic scanning electron microscopy (cryo-SEM) for visualizing cluster morphology.
Population balance equations to simulate aggregation kinetics.

Main Results:

Rg and Rh evolved in parallel, unlike rigid particle aggregation.
Cryo-SEM revealed sphere-like clusters, indicating complete particle coalescence.
Coalescence reduced total colloidal surface area, impacting surfactant adsorption and stability.

Conclusions:

Complete and rapid coalescence dominates the aggregation of this soft colloidal system.
Colloidal stability dynamically changes due to surface area reduction during aggregation.
Accurate modeling requires accounting for spherical clusters and time-varying colloidal stability.