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In the region where two bulk phases meet, an intricate electric charge distribution arises due to charge transfer, ion adsorption, molecular orientation, and charge distortion. This complex distribution is commonly referred to as the electrical double layer.When a solid electrode interfaces with ions in an electrolyte solution, the speed of electron transfer dictates the rates of oxidation and reduction. The electrode acquires a charge through the escape of atoms into the solution as cations or...

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Updated: Jun 29, 2026

Generation and Control of Electrohydrodynamic Flows in Aqueous Electrolyte Solutions

Generation and Control of Electrohydrodynamic Flows in Aqueous Electrolyte Solutions

Published on: September 7, 2018

Electrohydrodynamic flow and colloidal patterning near inhomogeneities on electrodes.

W D Ristenpart¹, P Jiang, M A Slowik

¹Department of Chemical Engineering, Princeton University, Princeton, NJ 08544, USA.

Langmuir : the ACS Journal of Surfaces and Colloids

|October 3, 2008

Summary

Current density variations on electrodes drive fluid motion, organizing colloidal particles. This electrohydrodynamic flow, controllable by electrode patterns, enables precise particle arrangement for advanced applications.

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Generation and Control of Electrohydrodynamic Flows in Aqueous Electrolyte Solutions

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The Preparation of Electrohydrodynamic Bridges from Polar Dielectric Liquids

The Preparation of Electrohydrodynamic Bridges from Polar Dielectric Liquids

Published on: September 30, 2014

Area of Science:

Physics
Fluid Dynamics
Colloid Science

Background:

Non-uniform current densities on electrodes can induce fluid motion.
This electrohydrodynamic (EHD) flow has potential applications in manipulating micro- and nanoparticles.

Purpose of the Study:

To analyze the electrohydrodynamic fluid flow generated by current density inhomogeneities on patterned electrodes.
To investigate the implications of this flow for the ordered arrangement of colloidal particles.

Main Methods:

Theoretical analysis using scaling laws and exact analytical solutions for streamlines.
Experimental validation using particle velocimetry near mechanically induced current density variations.

Main Results:

Flow velocity is proportional to applied voltage and current density difference.
Analytical solutions for streamlines were derived for periodic current density perturbations.
Experimental results closely matched theoretical predictions for flow near electrode "scratches".

Conclusions:

Electrohydrodynamic flow induced by current density inhomogeneities effectively organizes colloidal particles.
Patterned electrodes can be utilized to achieve desired colloidal particle arrangements.
The findings offer a pathway for controlled manipulation of colloidal systems.