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Sub-nm Pore Size Engineering in Metal-Phenolic Membranes.

Yi-Zhou Chen1, Qi-Zhi Zhong2,3, Jaslyn Ru Ting Chen3

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Researchers developed a new kinetic assembly strategy for metal-organic membranes, enabling precise, dynamic control over sub-nanometer pore sizes for advanced separations.

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Area of Science:

  • Materials Science
  • Nanotechnology
  • Chemical Engineering

Background:

  • Metal-organic membranes offer tunable nanopores for efficient separations.
  • Precise control over sub-nanometer pore size in dynamic membranes remains a challenge.

Purpose of the Study:

  • To develop a kinetic assembly strategy for precise, dynamic sub-nanometer pore size control in metal-phenolic networks (MPNs).
  • To engineer MPN membranes with stimuli-responsive properties for advanced separation applications.

Main Methods:

  • Utilized an oxidation-mediated coordination (OMC) kinetic assembly strategy for MPNs.
  • Engineered MPN membranes on anodic aluminum oxide substrates for pore size tuning.
  • Investigated pH-induced coordination transitions for reversible pore size changes.

Main Results:

  • Achieved a dynamic pore size engineering range of 0.73-1.43 nm, significantly wider than existing dynamic nanofiltration membranes.
  • Demonstrated suppression of undesirable iron species and uniform coordination environments via OMC assembly.
  • Successfully performed multistage fractionation of organic dyes, lignin derivatives, and nanoparticles (0.2-3.0 nm) using a single membrane.

Conclusions:

  • Kinetic assembly via OMC is a powerful method for controlling dynamic coordination networks in MPNs.
  • This approach enhances structural control and functional adaptability for stimuli-responsive separation applications.
  • The engineered MPN membranes show significant potential for energy-efficient, high-precision separations.