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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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Colloids and Suspensions

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Related Experiment Video

Updated: Jun 25, 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

Dynamics of a colloid-stabilized cream.

E M Herzig¹, A Robert, D D van 't Zand

¹SUPA School of Physics & Astronomy, University of Edinburgh, Mayfield Road, Edinburgh, EH9 3JZ, United Kingdom.

Physical Review. E, Statistical, Nonlinear, and Soft Matter Physics

|March 5, 2009

Summary

This summary is machine-generated.

We studied colloidal particle-stabilized emulsions and found two distinct aging dynamics. Young emulsions exhibit faster creaming, while older ones show slower dynamics with intermittent large movements.

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Published on: May 20, 2014

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Combining Microfluidics and Microrheology to Determine Rheological Properties of Soft Matter during Repeated Phase Transitions

Combining Microfluidics and Microrheology to Determine Rheological Properties of Soft Matter during Repeated Phase Transitions

Published on: April 19, 2018

Area of Science:

Colloid and Interface Science
Soft Matter Physics
Materials Science

Background:

Emulsion creaming is a critical phenomenon in various industries.
Understanding the dynamics of concentrated emulsions is essential for controlling their stability and performance.
Particle-stabilized emulsions offer unique properties compared to surfactant-stabilized ones.

Purpose of the Study:

To investigate the dynamics of high-volume-fraction emulsion creaming under gravity.
To characterize the aging process and identify different dynamic regimes in particle-stabilized emulsions.
To elucidate the role of colloidal particles in stabilizing emulsion interfaces and influencing creaming dynamics.

Main Methods:

X-ray Photon Correlation Spectroscopy (XPCS) was employed to probe dynamics.
A dodecane-in-water emulsion stabilized by silica colloidal particles was studied.
Intensity autocorrelation functions were analyzed to determine relaxation rates and line shape exponents.

Main Results:

Two distinct aging regimes were observed as the emulsion compacted.
Young emulsions showed faster dynamics with local rearrangements due to creaming.
Older emulsions exhibited slower dynamics characterized by large, intermittent events.
The relaxation rate scaled linearly with the wave vector.
The line shape exponent decreased from 1.5 in young samples to less than 1 in aged samples.

Conclusions:

The study reveals novel dynamics in aging, particle-stabilized emulsions.
A crossover between fast and slow dynamics, including intermittent large-scale motion, was identified.
The observed ballistic-like dynamics and changing exponent suggest complex rearrangements within the aging emulsion structure.