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Ion-Exchange Chromatography

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Ion-exchange chromatography, or IEC, is a technique for separating ions based on their affinity for the stationary phase. The stationary phase is a cross-linked polymer resin with covalently attached ionic functional groups. The functional groups can be either positively charged (cation exchangers) or negatively charged (anion exchangers). A cation exchanger consists of a polymeric anion and active cations, while an anion exchanger is a polymeric cation with active anions. The choice of...

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Related Experiment Video

Updated: Jun 15, 2026

Ion Exchange Chromatography (IEX) Coupled to Multi-angle Light Scattering (MALS) for Protein Separation and Characterization

Ion Exchange Chromatography (IEX) Coupled to Multi-angle Light Scattering (MALS) for Protein Separation and Characterization

Published on: April 5, 2019

Index variation from field-assisted ion exchange.

A R Cooper, M A El-Leil

|March 12, 2010

Summary

Unidirectional electric fields combined with diffusion create moving ion distributions in slabs and cylinders. The field direction determines if distributions are stationary or never reach a steady state, impacting optical material production.

Area of Science:

Physics
Materials Science

Background:

Understanding ion behavior under combined electric fields and diffusion is crucial for developing advanced materials.
Previous models often simplified the interplay between electric fields and diffusion processes.

Purpose of the Study:

To investigate concentration distributions of ions under combined electric fields and diffusion in different geometries.
To analyze the impact of electric field direction on ion distribution dynamics.
To explore the implications for producing graded-index optical materials.

Main Methods:

Mathematical modeling of ion transport.
Analysis of concentration distributions in slab and hollow cylinder geometries.
Simulation of ion behavior under unidirectional electric fields and diffusion.

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Using a Cyclic Ion Mobility Spectrometer for Tandem Ion Mobility Experiments

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Online Size-exclusion and Ion-exchange Chromatography on a SAXS Beamline

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Last Updated: Jun 15, 2026

Ion Exchange Chromatography (IEX) Coupled to Multi-angle Light Scattering (MALS) for Protein Separation and Characterization

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Published on: April 5, 2019

Using a Cyclic Ion Mobility Spectrometer for Tandem Ion Mobility Experiments

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Published on: January 20, 2022

Online Size-exclusion and Ion-exchange Chromatography on a SAXS Beamline

Online Size-exclusion and Ion-exchange Chromatography on a SAXS Beamline

Published on: January 5, 2017

Main Results:

A unidirectional electric field, aligned with ion velocity, produces stationary, self-similar concentration distributions moving at constant velocity.
An opposing electric field leads to ion mixing and distributions that do not reach a steady state.
The direction of the electric field is a critical factor in determining the final ion concentration profile.

Conclusions:

The study provides insights into controlling ion distributions for material fabrication.
The findings are directly applicable to the production of graded-index optical materials.
Tailoring electric field conditions allows for precise control over material properties.