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Related Experiment Video

Updated: May 15, 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

Interaction potentials between two colloidal particles surrounded by an extremely bidisperse particle suspension.

Shunxi Ji¹, John Y Walz

¹Virginia Tech, Department of Chemical Engineering, Blacksburg, VA 24061, USA. shunxiji@vt.edu

Journal of Colloid and Interface Science

|December 26, 2012

Summary

This study reveals that nanoparticles induce attractive depletion forces, creating complex interactions between microparticles and submicroparticles. These forces lead to long-range energies that influence colloidal dispersion stability and phase behavior.

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Last Updated: May 15, 2026

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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 Interface Science
Computational Physics
Materials Science

Background:

Understanding interparticle forces is crucial for controlling colloidal systems.
Existing models often simplify complex multi-component solutions.

Purpose of the Study:

To computationally predict equilibrium forces between microparticles in a solution with submicro- and nanoparticles.
To investigate the impact of nanoparticle-induced depletion forces on microparticle interactions.

Main Methods:

Calculated pairwise forces by summing interactions with an equilibrium distribution of smaller particles (2nd order density).
Developed an approximate analytical model using square well potentials for comparison.

Main Results:

Nanoparticles create an attractive depletion force, forming a submicroparticle 'halo' around microparticles.
Observed long-range attractive and repulsive energies between microparticles, not predictable from binary systems.
These forces exceed kT, significantly altering dispersion stability and potentially leading to novel phase behavior.

Conclusions:

The interplay of multiple particle sizes generates complex, long-range forces in colloidal systems.
The developed analytical model accurately predicts these forces, validating the computational approach.
Findings have implications for designing and stabilizing colloidal dispersions with tailored properties.