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Molecular Interactions and Layer Stacking Dictate Covalent Organic Framework Effective Pore Size.

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|August 20, 2021
PubMed
Summary

Two-dimensional covalent organic frameworks (COFs) achieve high performance in organic solvent nanofiltration. Their well-aligned pores and tunable interactions with solvents enable superior separation capabilities.

Keywords:
COFReaxFFcovalent organic frameworkorganic solvent nanofiltrationreactive force field molecular dynamicssolid−liquid interactions

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Area of Science:

  • Materials Science
  • Chemical Engineering
  • Physical Chemistry

Background:

  • Understanding molecular interactions at solid-liquid interfaces is crucial for separation technologies.
  • Achieving both high permeance and selectivity in organic solvents remains a significant challenge.
  • Two-dimensional covalent organic frameworks (COFs) show promise for advanced separation applications.

Purpose of the Study:

  • To investigate the separation performance of an imine-linked carboxylated COF (C-COF) in organic solvents.
  • To elucidate the molecular mechanisms behind the COF's separation capabilities.
  • To explore the influence of solvent environment on pore size and solute interactions.

Main Methods:

  • Reactive force field molecular dynamics (MD) modeling.
  • Experimental characterization and performance testing of the C-COF.
  • Analysis of pore structure and solvent-solute interactions.

Main Results:

  • The C-COF exhibited ultrahigh permeance and high selectivity in organic solvent nanofiltration.
  • Well-aligned, highly crystalline pores were identified as key to the separation performance.
  • Effective pore size and solvated solute radii were found to be highly dependent on the solvent environment.

Conclusions:

  • The C-COF demonstrates unprecedented organic solvent nanofiltration performance.
  • Molecular-level insights into solvent-COF interactions enable tailored material design.
  • This work paves the way for application-specific design of COFs for challenging separations.