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Highly efficient charge inversion in dense periodic nanoporous framework membranes.

Yan Wang1,2, Shixian Xin2, Keyi Yang1

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Summary
This summary is machine-generated.

Charge inversion in covalent organic framework (COF) membranes, modulated by cations, allows for tunable ion selectivity. This electrokinetic phenomenon enables a reversible switch between cation and anion transport in nanofluidic systems.

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Area of Science:

  • Electrokinetics
  • Nanofluidics
  • Materials Science

Background:

  • Charge inversion (overscreening) is a key electrokinetic phenomenon for controlling ion selectivity in nanofluidic systems.
  • Covalent organic frameworks (COFs) offer tunable properties for advanced membrane applications.

Purpose of the Study:

  • To investigate charge inversion in a COF membrane modulated solely by monovalent cations.
  • To demonstrate reversible switching of ion selectivity (cation to anion) in nanofluidic systems using COFs.

Main Methods:

  • Fabrication and characterization of a COF membrane.
  • Electrolyte manipulation with monovalent cations.
  • Ion transport and selectivity measurements in nanofluidic channels.

Main Results:

  • Achieved charge inversion in the COF membrane solely through monovalent cation modulation.
  • Demonstrated a reversible switch from cation to anion selectivity.
  • Identified high saturated ion adsorption capacity and synergistic pore interactions as key factors.

Conclusions:

  • COF membranes can exhibit tunable ion selectivity via charge inversion.
  • The observed phenomenon is driven by high ion adsorption capacity and nanoconfinement effects within the COF structure.
  • This provides a novel pathway for designing smart nanofluidic devices.