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Related Experiment Video

Updated: May 11, 2025

Preparation of Janus Particles and Alternating Current Electrokinetic Measurements with a Rapidly Fabricated Indium Tin Oxide Electrode Array

Preparation of Janus Particles and Alternating Current Electrokinetic Measurements with a Rapidly Fabricated Indium Tin Oxide Electrode Array

Published on: June 23, 2017

Electrostatic interactions between anisotropic particles.

Harshit Joshi¹, Anubhab Roy²

¹International Centre for Theoretical Sciences, Bengaluru (ICTS-TIFR), Karnataka 560089, India.

Physical Review. E

|April 18, 2025

Summary

This study explores electrostatic interactions between charged anisotropic conductors. Electrostatic torques can alter the alignment and instability of settling spheroids in suspensions.

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Area of Science:

Physics
Materials Science
Fluid Dynamics

Background:

Understanding electrostatic interactions is crucial for predicting the behavior of charged particles in various environments.
Anisotropic conductors, like spheroids, exhibit complex behaviors influenced by their shape and charge distribution.

Purpose of the Study:

To investigate electrostatic interactions between two charged anisotropic conductors.
To analyze the influence of these interactions on the dynamics of particle suspensions.

Main Methods:

Employed a combination of asymptotic methods (method of reflections, lubrication approximation) and numerical techniques (boundary integral method).
Specifically implemented for spheroid-sphere and spheroid-spheroid systems to capture anisotropy.
Derived analytical expressions for electrostatic force and torque in the far-field regime.

Main Results:

Validated numerical results with asymptotic solutions for near and far-field interactions.
Derived analytical expressions for electrostatic force and torque between spheroids.
Showed that electrostatic torque competes with or reinforces hydrodynamic alignments of settling spheroids.

Conclusions:

Electrostatic interactions significantly influence the orientation and dynamics of anisotropic particles.
The inclusion of electrostatic effects is important for understanding instabilities in dilute suspensions of spheroids.