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Related Experiment Video

Updated: Jul 4, 2026

Quantitative and Qualitative Examination of Particle-particle Interactions Using Colloidal Probe Nanoscopy

Quantitative and Qualitative Examination of Particle-particle Interactions Using Colloidal Probe Nanoscopy

Published on: July 18, 2014

Detection of elementary charges on colloidal particles.

Filip Strubbe¹, Filip Beunis, Kristiaan Neyts

¹Ghent University, Electronics and Information Systems, Sint-Pietersnieuwstraat 41, Ghent B-9000, Belgium.

Physical Review Letters

|June 4, 2008

Summary

Researchers precisely measured the electric charge on individual colloidal particles, achieving resolution beyond the elementary charge. This breakthrough offers new insights into particle surface interactions and dynamics.

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Synthesis and Characterization of Supramolecular Colloids

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Published on: April 22, 2016

Area of Science:

Colloid Science
Surface Chemistry
Nanotechnology

Background:

Understanding the charge of colloidal particles is crucial for predicting their behavior in various applications.
Previous methods lacked the resolution to precisely quantify charge at the elementary level.

Purpose of the Study:

To develop a method for determining the charge of individual colloidal particles with sub-elementary charge resolution.
To accurately measure particle size and observe charge dynamics over time.

Main Methods:

Utilized optical tracking of weakly charged silica spheres in an electric field within a nonpolar medium.
Analyzed tracking data to deduce particle charge and size.

Main Results:

Achieved charge determination with resolution exceeding the elementary charge.
Accurately determined particle size.
Observed discrete charge transfer events (ionization/recombination) at particle surfaces.

Conclusions:

The developed method enables precise characterization of colloidal particle charge.
Direct observation of charge dynamics provides insights into surface ionization and recombination processes.