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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...

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Related Experiment Video

Updated: Mar 16, 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

Colloidal Particles in Thin Nematic Wetting Films.

Haifa Jeridi¹, Mykola Tasinkevych^2,3, Tahar Othman¹

¹Université de Tunis El Manar , Faculté des Sciences de Tunis, LR99ES16 Laboratoire Physique de la Matière Molle et de la Modélisation Electromagnétique, 2092, Tunis, Tunisia.

Langmuir : the ACS Journal of Surfaces and Colloids

|August 19, 2016

Summary

This summary is machine-generated.

Colloidal particles in liquid crystal films create elastic deformations. Film thickness and particle size influence these patterns, with capillary effects becoming dominant in thinner films.

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Synthesis and Characterization of Supramolecular Colloids

Synthesis and Characterization of Supramolecular Colloids

Published on: April 22, 2016

Area of Science:

Soft Matter Physics
Materials Science
Colloid Science

Background:

Nematic liquid crystals exhibit unique elastic properties.
Colloidal inclusions can induce significant changes in liquid crystal behavior.
Hybrid anchoring conditions influence molecular orientation at interfaces.

Purpose of the Study:

To investigate elastic deformations caused by colloidal inclusions in thin nematic liquid crystal films.
To understand the interplay between particle size, film thickness, and capillary effects.
To elucidate the origins of diverse textures observed in these systems.

Main Methods:

Experimental observation of elastic deformations and birefringence patterns.
Theoretical analysis using a 2D model combining capillarity and nematic elasticity.
3D Landau-de Gennes modeling at the particle scale.

Main Results:

Elastic dipoles and defects form around particles, similar to bulk liquid crystal cells.
Capillary effects significantly alter dipole appearance and birefringence in thin films (film thickness < particle size).
Film thickness and particle size were found to influence observed patterns.

Conclusions:

A 2D model successfully explains large-scale experimental features and transitions by incorporating capillarity and nematic elasticity.
3D modeling reveals that free interfaces and confinement lead to metastable configurations.
These metastable states are quenched during film spreading or particle trapping, explaining texture variety.