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Related Concept Videos

Ion Exchange01:17

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 basic...
Potentiometry: Membrane Electrodes01:15

Potentiometry: Membrane Electrodes

Membrane electrodes, also known as p-ion electrodes, use membranes that selectively interact with free analyte ions, generating a potential difference across the membrane. The resulting membrane potential, known as the asymmetry potential, is not zero even when analyte concentrations on both sides of the membrane are equal. The membrane's response is typically not selective to a single analyte but proportional to the concentration of all ions in the sample solution capable of interacting at the...
Dialysis01:15

Dialysis

Dialysis is a diffusion-based purification process that separates analyte molecules from a complex matrix. This is accomplished by allowing molecules in the solution to pass through a semipermeable membrane into a liquid on the other side. The membrane is usually made of cellulose acetate or cellulose nitrate, and the second liquid must be miscible with the solution. Ions (e.g., chloride or sodium) or organic molecules (e.g., glucose) can pass through the membrane pores, which generally have...
Ion-Exchange Chromatography01:09

Ion-Exchange Chromatography

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...
Peritoneal Dialysis I: Introduction and Procedure01:30

Peritoneal Dialysis I: Introduction and Procedure

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Pore Transport and Ion-Pair Transport01:17

Pore Transport and Ion-Pair Transport

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Related Experiment Video

Updated: Jun 3, 2026

Merging Ion Concentration Polarization between Juxtaposed Ion Exchange Membranes to Block the Propagation of the Polarization Zone
08:06

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

Published on: February 23, 2017

Controlled porosity monolithic material as permselective ion exchange membranes.

Xiaojia Huang1, Purnendu K Dasgupta

  • 1State Key Laboratory of Marine Environmental Science, Environmental Science Research Center, Xiamen University, China.

Analytica Chimica Acta
|March 15, 2011
PubMed
Summary

Researchers developed rigid, permselective ion exchange polymers for microscale analytical devices. These novel materials mimic ion exchange membranes (IEMs), enabling advancements in miniaturized ion chromatography and open tubular systems.

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Ion-Exchange Membranes for the Fabrication of Reverse Electrodialysis Device
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Last Updated: Jun 3, 2026

Merging Ion Concentration Polarization between Juxtaposed Ion Exchange Membranes to Block the Propagation of the Polarization Zone
08:06

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

Published on: February 23, 2017

Ion-Exchange Membranes for the Fabrication of Reverse Electrodialysis Device
07:55

Ion-Exchange Membranes for the Fabrication of Reverse Electrodialysis Device

Published on: July 20, 2021

Area of Science:

  • Analytical Chemistry
  • Materials Science
  • Polymer Chemistry

Background:

  • Ion exchange membranes (IEMs) are crucial for analytical devices in ion chromatography but are difficult to miniaturize due to flexibility and hydration-induced dimensional changes.
  • Miniaturization in analytical chemistry, particularly for open tubular ion chromatography, necessitates microscale adaptations of IEMs.
  • Existing ion exchange materials for chromatography packing differ from membranes, which possess molecular-scale pores and vicinal ion exchange sites for ion exclusion.

Purpose of the Study:

  • To develop rigid, microscale-adaptable ion exchange materials that function similarly to ion exchange membranes (IEMs).
  • To achieve permselectivity in ion exchange materials for advanced chromatographic applications.
  • To demonstrate the utility of these novel materials in open tubular ion chromatography systems.

Main Methods:

  • Synthesis of monolithic polymers from ethylene dimethacrylate-glycidyl methacrylate.
  • Controlled addition of porogen during synthesis to engineer pore structure and rigidity.
  • Conversion of the synthesized polymers to anion exchangers via treatment with trimethylamine.
  • Evaluation of the resulting polymers for ion permselectivity and performance as open tubular cation chromatography suppressors.

Main Results:

  • Successfully synthesized rigid ion exchange polymers with controlled porosity by adjusting porogen concentration.
  • Demonstrated that these polymers exhibit ion permselectivity, allowing only ions of a specific charge to pass.
  • Validated the performance of these novel materials as effective suppressors in open tubular cation chromatography.

Conclusions:

  • Rigid, permselective ion exchange polymers can be fabricated by controlling porogen content during monolithic polymer synthesis.
  • These materials offer a viable microscale alternative to traditional flexible ion exchange membranes for miniaturized analytical devices.
  • The demonstrated success in open tubular cation chromatography suppressor applications highlights their potential for advancing microscale ion chromatography.