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Electrochemical systems provide a fascinating insight into the dynamic interplay of charged species within various phases. One notable example is the interaction between a membrane permeable to K⁺ ions but not to Cl⁻ ions, separating an aqueous KCl solution from pure water. As K⁺ ions diffuse through the membrane, they generate net charges on each phase, leading to a potential difference between them.Similarly, when a piece of Zn is immersed in an aqueous ZnSO₄ solution, the Zn metal, composed...

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Updated: Jul 15, 2026

Spatial Separation of Molecular Conformers and Clusters

Spatial Separation of Molecular Conformers and Clusters

Published on: January 9, 2014

Phase-separation in ion-containing mixtures in electric fields.

Yoav Tsori¹, Ludwik Leibler

¹Department of Chemical Engineering, Ben-Gurion University of the Negev, P.O. Box 653, Beer-Sheva 84105, Israel. tsori@bgu.ac.il

Proceedings of the National Academy of Sciences of the United States of America

|April 20, 2007

Summary

Applying electric fields to liquid mixtures induces phase separation. This robust transition, requiring low voltage (around 1 V), is geometry-independent and has microfluidic applications like creating lubrication layers.

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Area of Science:

Physical Chemistry
Materials Science
Microfluidics

Background:

Ionic screening in liquid mixtures under electric fields creates field gradients.
Homogeneous liquid mixtures can undergo phase transitions influenced by these gradients.

Purpose of the Study:

To investigate the phase-separation transition induced by electric fields in liquid mixtures.
To explore the characteristics and applications of this field-induced phase separation.

Main Methods:

Subjecting liquid mixtures to external electric fields.
Analyzing the effects of ionic screening and resulting field gradients.
Investigating phase separation in various electrode geometries.

Main Results:

A robust phase-separation transition is induced by electric fields.
Phase separation occurs irrespective of electrode geometry.
The required voltage is typically low, around 1 V or less.

Conclusions:

Electric field-induced ionic screening offers a versatile method for robust phase separation in liquid mixtures.
This phenomenon is applicable in microfluidics, enabling the formation of nanometer-scale lubrication layers and slip length modification.