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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: Jul 7, 2026

Particle Templated Emulsification enables Microfluidic-Free Droplet Assays

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Published on: March 9, 2021

Droplet structure instability in concentrated emulsions.

Yasushi Saiki¹, Roger G Horn, Clive A Prestidge

¹Ian Wark Research Institute, ARC Special Research Centre for Particle and Material Interfaces, University of South Australia, Mawson Lakes, South Australia 5095, Australia.

Journal of Colloid and Interface Science

|February 19, 2008

Summary

Concentrated emulsions exhibit structural instability at high volume fractions, indicated by a drop in the elastic to viscous modulus ratio. This instability, linked to droplet deformation and slip planes, is a key indicator of emulsion structural integrity.

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Area of Science:

Colloid and Surface Science
Materials Science
Rheology

Background:

Concentrated emulsions are complex fluids with applications in various industries.
Understanding their structural stability under different conditions is crucial for formulation and performance.
Droplet deformability and interdroplet interactions significantly influence emulsion behavior.

Purpose of the Study:

To investigate the structural stability of concentrated emulsions using dynamic rheological measurements.
To determine the influence of droplet cross-linking and volume fraction on emulsion rheology.
To identify indicators of structural instability in concentrated emulsions.

Main Methods:

Dynamic rheological measurements were performed on sodium dodecyl sulfate-stabilized polydimethylsiloxane emulsions.
Varying droplet cross-linking levels and volume fractions (0.5 to 0.72) were studied.
The ratio of elastic modulus (G ) to viscous modulus (G ), denoted as gamma(co), was analyzed.

Main Results:

Emulsion structural instability was observed at a volume fraction of 0.7, characterized by an anomalously low gamma(co).
This instability was independent of droplet cross-linking level.
The phenomenon was not observed in hard-sphere silica sols, suggesting a mechanism specific to deformable, repulsive droplets.

Conclusions:

Structural instability in concentrated emulsions at high volume fractions arises from deformation-induced slip planes between droplet layers.
The gamma(co) value serves as an in situ index for assessing structural stability and interdroplet interaction balance.
Findings provide insights into the behavior of concentrated emulsions and their formulation.