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Related Experiment Video

Updated: May 13, 2026

An Analog Macroscopic Technique for Studying Molecular Hydrodynamic Processes in Dense Gases and Liquids

An Analog Macroscopic Technique for Studying Molecular Hydrodynamic Processes in Dense Gases and Liquids

Published on: December 4, 2017

In situ granular charge measurement by free-fall videography.

S R Waitukaitis¹, H M Jaeger

¹Department of Physics, The University of Chicago, 5720 S. Ellis Ave, Chicago, Illinois 60637, USA.

The Review of Scientific Instruments

|March 8, 2013

Summary

We developed a new method to measure individual particle charges in granular materials, offering high resolution for studying electrostatic interactions and charge transfer processes in macroscopic grains.

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Area of Science:

Physics
Materials Science
Electrostatics

Background:

Measuring individual particle charges in granular media is crucial for understanding electrostatic interactions.
Previous methods lacked the resolution and capability to analyze macroscopic grains and different particle types simultaneously.

Purpose of the Study:

To present a novel experimental technique for high-resolution measurement of individual particle charges in macroscopic granular ensembles.
To enable the study of charge transfer processes between different particle species within granular materials.

Main Methods:

Observing freely falling macroscopic grains (∼300 μm diameter) accelerated by a horizontal electric field within a vacuum.
Utilizing a co-falling, high-speed video camera for extended particle tracking and enhanced measurement precision.
Eliminating air drag to isolate electrostatic forces as the primary driver of particle acceleration.

Main Results:

Achieved an average acceleration resolution of ∼0.008 m/s², a force resolution of ∼500 pN.
Obtained a median charge resolution of ∼6× 10⁴ elementary charges per grain (∼1 elementary charge/μm² surface density).
Demonstrated the ability to distinguish between different particle types via direct imaging.

Conclusions:

The developed technique provides unprecedented resolution for characterizing charging in granular media.
Direct imaging capability allows for studying inter-species charge transfer, a significant advancement for granular physics.
Future improvements in camera and optics technology can further reduce errors related to mass indeterminacy.