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Ion Exchange

Ion Exchange

Ion exchange chromatography separates charged molecules from a solution by reversibly exchanging them with mobile, or 'active', ions associated with the oppositely charged stationary phase. This method can be used to separate ions, soften and deionize water, and purify solutions. The polymers comprising the ion-exchange column are high-molecular-weight and chemically stable polymers, crosslinked to be porous and essentially insoluble. They are also functionalized with either acidic or...

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Adaptive Polyzwitterion Coatings Enable Optimal Ion Rectification in Functionalized Nanochannels.

Aditya Patwari¹, Abhirup Chaudhuri², Chirodeep Bakli³

¹Advanced Technology Development Centre, Indian Institute of Technology Kharagpur, Kharagpur 721302, India.

Analytical Chemistry

|November 20, 2025

Summary

Researchers developed pH-sensitive ion current rectification (ICR) in cylindrical nanochannels using zwitterionic polyelectrolytes. This approach overcomes limitations of conical nanopores, enabling tunable, diode-like ion transport for smart sensors.

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Area of Science:

Nanotechnology
Materials Science
Physical Chemistry

Background:

Biological ion channels inspire synthetic nanopores for nanofluidic diodes.
Conical nanopores face challenges like clogging and complex fabrication.
Existing synthetic diodes often lack precise control and tunability.

Purpose of the Study:

To investigate pH-sensitive ion current rectification (ICR) in cylindrical nanochannels.
To overcome fabrication and operational limitations of conical nanopores.
To develop a tunable platform for smart ion-based sensors.

Main Methods:

Utilizing nonuniform grafting of a zwitterionic polyelectrolyte layer in cylindrical nanochannels.
Investigating ion current rectification (ICR) induced by spatial charge variation.
Developing a simplified analytical model to predict rectification patterns.

Main Results:

Achieved pH-sensitive ion rectification in cylindrical nanochannels via zwitterionic polyelectrolyte grafting.
Identified an optimal polyelectrolyte zwitterionic layer thickness (tPZL) for maximal rectification, challenging previous assumptions.
Demonstrated pH-dependent tunability of rectification characteristics and diode-like response.

Conclusions:

Cylindrical nanochannels with nonuniform zwitterionic grafting offer a viable alternative to conical nanopores for nanofluidic diodes.
The findings provide a versatile platform for pH-responsive ion rectification and smart sensor development.
The developed analytical model aids in optimizing tPZL for specific operating conditions.