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Colloids and Suspensions

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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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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...

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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Related Experiment Video

Updated: Jun 3, 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

Continuum theory for cluster morphologies of soft colloids.

A Kosmrlj¹, G J Pauschenwein, G Kahl

¹Massachusetts Institute of Technology, Cambridge, Massachusetts 02139-4307, United States.

The Journal of Physical Chemistry. B

|March 10, 2011

Summary

This study presents a thermodynamic model for core-corona colloids, simplifying complex particle interactions to predict various structures like spheres and lamellae. The model accurately describes colloidal phase behavior and transitions.

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Area of Science:

Colloid Science
Thermodynamics
Materials Science

Background:

Colloids with core-corona architectures exhibit complex phase behavior.
Existing theories for these systems can be computationally intensive.
Understanding their thermodynamics is crucial for materials design.

Purpose of the Study:

To develop a simplified continuum thermodynamic model for core-corona colloids.
To predict and analyze various colloidal morphologies (spherical, columnar, lamellar, inverted clusters).
To investigate the influence of corona overlap on phase behavior.

Main Methods:

Developed a continuum description using a step profile approximation for thick coronas.
Applied the model to monodisperse particles with hard-core/square-shoulder interactions.
Derived analytical expressions for enthalpy, lattice spacing, cluster size, and phase-transition pressures.

Main Results:

The model successfully predicts spherical, columnar, lamellar, and inverted cluster morphologies.
Analytical expressions provide insights into the mechanisms driving these structures.
Model accuracy improves with increasing shoulder width, validated against crystalline configurations.

Conclusions:

The continuum model offers a computationally efficient approach to studying core-corona colloid thermodynamics.
The step profile approximation effectively captures the behavior of overlapping coronas.
Future work can extend the model to include finite-temperature effects for broader applicability.