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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: Jun 17, 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

Controlled flats on spherical polymer colloids.

Laura Mely Ramírez¹, Scott T Milner, Charles E Snyder

¹Department of Chemical Engineering, Pennsylvania State University, University Park, Pennsylvania 16802, USA.

Langmuir : the ACS Journal of Surfaces and Colloids

|January 1, 2010

Summary

This summary is machine-generated.

Researchers developed a method to create flat spots on polystyrene spheres for self-assembly. The flat spot radius scales with time to the power of 1/3, matching theoretical predictions and experimental data.

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Area of Science:

Materials Science
Polymer Science
Colloid Science

Background:

Heterogeneous colloidal particles enable controlled self-assembly.
Surface modifications are key to tailoring particle interactions.

Purpose of the Study:

To develop a method for creating micrometer-sized polystyrene spheres with controlled flat spots.
To investigate the scaling theory of the flattening process.

Main Methods:

Polystyrene spheres were settled on a glass substrate.
Controlled heating above the glass-transition temperature induced particle spreading.
The radius of the circular flat spot was measured as a function of time.

Main Results:

A method for preparing polystyrene spheres with tunable flat spots was established.
Experimental results showed the flat radius grows as t(1/3).
The observed growth kinetics align with the developed scaling theory.

Conclusions:

The study provides a reliable method for fabricating functionalized colloidal particles.
The t(1/3) scaling law accurately describes the hydrodynamics of the flattening process.
This technique offers potential for precise control over colloidal self-assembly.