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Related Concept Videos

Ion Exchange01:17

Ion Exchange

537
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...
537
Dialysis01:15

Dialysis

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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...
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Potentiometry: Membrane Electrodes01:15

Potentiometry: Membrane Electrodes

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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...
446

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Related Experiment Video

Updated: Jun 1, 2025

Ion-Exchange Membranes for the Fabrication of Reverse Electrodialysis Device
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Constructing new-generation ion exchange membranes under confinement regime.

Xingya Li1, Peipei Zuo1, Xiaolin Ge1

  • 1Key Laboratory of Precision and Intelligent Chemistry, School of Chemistry and Materials Science, University of Science and Technology of China, Hefei 230026, China.

National Science Review
|January 20, 2025
PubMed
Summary

New ion exchange membranes (IEMs) utilize microporous frameworks to overcome traditional limitations, enabling enhanced ion transport for applications in energy storage and separation technologies.

Keywords:
energy storage and productionion exchange membranesion permeability/conductivityion selectivitymicroporous confinement regime

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Area of Science:

  • Materials Science
  • Electrochemistry
  • Chemical Engineering

Background:

  • Ion exchange membranes (IEMs) are crucial for selective ion transport and electrode reactions in energy and separation applications.
  • Traditional IEMs face a trade-off between permeability and selectivity due to polymer swelling.
  • New-generation IEMs leverage microporous frameworks for improved ion transport under confinement.

Purpose of the Study:

  • To review fundamental principles of ion transport in charged channels.
  • To highlight the construction and confinement effects in new-generation IEMs.
  • To discuss applications and future prospects of advanced IEMs.

Main Methods:

  • Review of fundamental principles of ion transport in charged channels (nanometer to sub-nanometer scale).
  • Focus on construction of new-generation IEMs utilizing microporous frameworks.
  • Elucidation of microporous confinement effects (sub-2nm to ultra-micropores) on ion transport.

Main Results:

  • Microporous confinement in new IEMs enhances ion transport properties through size sieving and channel interactions.
  • Demonstrated potential for breaking the permeability/conductivity and selectivity trade-off.
  • Successful application in lithium separation, flow batteries, water electrolysis, and ammonia synthesis.

Conclusions:

  • New-generation IEMs with microporous frameworks offer superior ion transport.
  • These membranes overcome limitations of traditional IEMs, enabling advanced applications.
  • Future research should focus on microstructure observation, in-situ visualization, and scalable fabrication.