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Updated: Feb 28, 2026

Merging Ion Concentration Polarization between Juxtaposed Ion Exchange Membranes to Block the Propagation of the Polarization Zone

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Published on: February 23, 2017

Visualizing Enhanced Microfluidic Electromembrane Desalination Using Nafion-Coated Heterogeneous Ion-Exchange

Hyunwoo Choi¹, Bonseung Ku¹, Seokhee Han²

¹Department of Mechanical and Automotive Engineering, Kongju National University, Cheonan 31080, Republic of Korea.

Molecules (Basel, Switzerland)

|February 27, 2026

Summary

This summary is machine-generated.

Coating heterogeneous ion-exchange membranes with Nafion enhances desalination by amplifying electro-convection (EC) vortices. This surface modification boosts current efficiency and salt removal, demonstrating a new path for high-performance water purification.

Keywords:

Nafion coating desalination electro-convection heterogeneous ion-exchange membrane microfluidics over-limiting current surface modification visualization water splitting

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Proof-of-Concept for Gas-Entrapping Membranes Derived from Water-Loving SiO2/Si/SiO2 Wafers for Green Desalination

Published on: March 1, 2020

Area of Science:

Membrane science
Electrochemistry
Fluid dynamics

Background:

Heterogeneous ion-exchange membranes (IEMs) offer cost-effectiveness but exhibit low electrochemical efficiency due to surface imperfections.
Surface modification with homogeneous ionomers is a strategy to improve IEMs, but its direct impact on electro-hydrodynamic behavior and desalination performance is not well understood.

Purpose of the Study:

To visualize and quantify the performance enhancement of Nafion-coated heterogeneous cation exchange membranes (CEMs) using a microfluidic platform.
To investigate the relationship between surface modification, electro-convection (EC), and desalination performance.

Main Methods:

Utilized a microfluidic platform for direct visualization and quantification of electro-hydrodynamic phenomena.
Employed Nafion coating on heterogeneous CEMs as a surface modification strategy.
Conducted continuous desalination experiments to assess performance metrics.

Main Results:

Nafion coating significantly amplified electro-convection (EC) vortices, contrary to conventional theories linking EC to hydrophobicity.
Visualizations revealed the coating acts as an electrical nozzle, focusing the electric field and promoting vortex growth.
The coating suppressed parasitic water-splitting reactions by sealing catalytic sites.
Desalination experiments showed a 32% increase in current efficiency and an 18% increase in salt removal ratio compared to bare membranes.

Conclusions:

Controlled hydrodynamic instability induced by surface modification is a key factor for high-efficiency desalination.
Nafion coating on heterogeneous CEMs enhances desalination performance through amplified EC and suppression of parasitic reactions.
This study provides visual evidence and quantification of performance enhancement via surface modification, offering a new strategy for membrane-based water treatment.