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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...
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Interface Engineering by Molecular Layer Deposition on Polymer Membrane for Selective Ion Transport.

Agnes Maria Mani1,2, Niranjan Singh Baghel3, Saurabh Mukherjee1

  • 1Radiochemistry Division, Bhabha Atomic Research Centre, Mumbai, 400085, India.

Small (Weinheim an Der Bergstrasse, Germany)
|December 5, 2024
PubMed
Summary

Molecular layer deposition of ethylene glycol-alucone on Nafion membranes enhances ion selectivity. This modification creates a hybrid interface with size-based exclusion, improving monovalent ion separation without hindering conductivity.

Keywords:
density functional theoryion transportmolecular layer depositionnafionpositron

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Area of Science:

  • Materials Science
  • Polymer Chemistry
  • Surface Engineering

Background:

  • Nafion membranes are crucial for ion transport but often lack selectivity.
  • Enhancing ion selectivity is key for advanced separation technologies.

Purpose of the Study:

  • To investigate molecular layer deposition (MLD) of ethylene glycol-alucone (EG-alucone) on Nafion.
  • To understand the impact of EG-alucone MLD on Nafion morphology and ion transport selectivity.

Main Methods:

  • X-ray photoelectron spectroscopy (XPS)
  • Scanning electron microscopy (SEM)
  • Density functional theory (DFT)
  • Doppler broadening positron annihilation spectroscopy (DBPAS)
  • Electrochemical impedance spectroscopy (EIS)
  • Radiotracer-based transport measurements

Main Results:

  • MLD creates an Al-F bond at the EG-alucone/Nafion interface, forming a hybrid region.
  • This hybrid region exhibits size-based exclusion properties, enhancing monovalent ion selectivity.
  • Post-deposition hydration forms a positively charged alumina layer, further contributing to selectivity.
  • Improved Cs+/Na+ and Cs+/Ba2+ selectivity achieved without significant conductivity loss.

Conclusions:

  • EG-alucone MLD effectively engineers the Nafion interface for improved ion selectivity.
  • A three-layer model explains the structure-property relationship governing selective ion transport.
  • This approach offers a promising strategy for advanced membrane separation applications.