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Related Concept Videos

Ion Exchange01:17

Ion Exchange

978
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...
978

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Merging Ion Concentration Polarization between Juxtaposed Ion Exchange Membranes to Block the Propagation of the Polarization Zone
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Moldable Strong Cation Exchange Polymer and Microchannel Fabrication.

Fereshteh Maleki1, Purnendu K Dasgupta1

  • 1Department of Chemistry and Biochemistry, University of Texas at Arlington, Arlington, Texas 76019-0065, United States.

Analytical Chemistry
|September 1, 2020
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Summary

Researchers developed a novel cation exchange membrane (CEM) using poly(vinyl alcohol) and sodium styrenesulfonate. This high-capacity membrane exhibits superior performance and durability compared to benchmark materials like Nafion.

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Area of Science:

  • Materials Science
  • Polymer Chemistry
  • Electrochemistry

Background:

  • Cation exchange membranes (CEMs) are crucial for electrochemical applications.
  • Existing CEMs like Nafion have limitations in capacity and water uptake.
  • Development of advanced CEMs with tailored properties is essential.

Purpose of the Study:

  • To synthesize and characterize a novel high-capacity CEM.
  • To evaluate its ion exchange capacity, water uptake, and conductivity.
  • To assess its stability and potential for microchannel fabrication.

Main Methods:

  • Synthesis of CEMs from aqueous poly(vinyl alcohol) (PVA) and sodium styrenesulfonate.
  • Characterization of ion exchange capacity (IEC) and water uptake.
  • Measurement of specific conductance and conductance anisotropy.
  • Assessment of material stability through regeneration and boiling tests.
  • Demonstration of microchannel fabrication.

Main Results:

  • Achieved ion exchange capacities (IECs) over twice that of Nafion.
  • Demonstrated 5-10x greater water uptake compared to Nafion.
  • Observed increased specific conductance with higher IECs and decreased anisotropy.
  • Confirmed material stability under harsh conditions (boiling, regeneration).
  • Successfully fabricated a robust ion exchanger microchannel.

Conclusions:

  • The novel PVA-based CEM offers significantly higher capacity and water uptake than Nafion.
  • The material exhibits excellent stability and tunable properties.
  • This CEM shows promise for advanced electrochemical devices and microfluidic applications.