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Electrophoretic Crystallization of Ultrathin High-performance Metal-organic Framework Membranes
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Electrostatic-modulated interfacial polymerization toward ultra-permselective nanofiltration membranes.

Xinda You1,2, Ke Xiao1,2, Hong Wu1,2,3,4

  • 1Key Laboratory for Green Chemical Technology of Ministry of Education, School of Chemical Engineering and Technology, Tianjin University, Tianjin 300072, China.

Iscience
|April 26, 2021
PubMed
Summary

Electrostatic-modulated interfacial polymerization (eIP) creates ultra-thin, highly selective polyamide membranes. This method uses charged substrates to control monomer diffusion, improving membrane performance for advanced applications.

Keywords:
Materials ChemistryMaterials ScienceMaterials SynthesisPolymersSupramolecular Materials

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Area of Science:

  • Materials Science
  • Polymer Chemistry
  • Separation Technology

Background:

  • Interfacial polymerization (IP) is key for ultrathin membranes.
  • Current IP methods often use short-range interactions, limiting permselectivity.

Purpose of the Study:

  • To develop an electrostatic-modulated interfacial polymerization (eIP) method.
  • To create ultra-permselective polyamide membranes using charged substrates.

Main Methods:

  • Utilized supercharged, phosphate-rich substrates with phytate.
  • Employed long-range electrostatic attraction to control monomer diffusion.
  • Tuned charge density via metal-organophosphate coordination.

Main Results:

  • Generated polyamide membranes with reduced thickness (nearly 10 nm) and enhanced cross-linking.
  • Achieved superior water permeance and ionic selectivity.
  • Demonstrated eIP's applicability to various IP processes and materials.

Conclusions:

  • eIP offers a novel strategy for fabricating high-performance ultrathin membranes.
  • This approach enhances control over membrane structure and properties.
  • The eIP method is versatile for diverse advanced membrane applications.