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Microfluidic-based Synthesis of Covalent Organic Frameworks COFs: A Tool for Continuous Production of COF Fibers and Direct Printing on a Surface
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Dynamic Two-Dimensional Covalent Organic Frameworks with Large Solvent-Induced Lattice Expansion.

Anastasiya Pratasouskaya1, Volodymyr Bon2, Alina Müller1

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Journal of the American Chemical Society
|October 15, 2024
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Summary
This summary is machine-generated.

Researchers developed dynamic two-dimensional covalent organic frameworks (2D COFs) that expand up to 85% when exposed to solvents. These adaptable materials offer new possibilities for gas separation and sensing applications.

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Area of Science:

  • Materials Science
  • Nanotechnology
  • Chemistry

Background:

  • Dynamic covalent organic frameworks (COFs) exhibit reversible phase transitions triggered by guest molecules, affecting unit cell parameters and porosity.
  • Previous research showed significant volume changes in 3D COFs, but 2D COFs had limited solvent-induced volume changes.

Purpose of the Study:

  • To design and synthesize novel 2D COFs with enhanced solvent-induced volume changes.
  • To investigate the effect of interconnecting bridge unit length on the dynamic behavior of 2D COFs.

Main Methods:

  • Systematic variation of interconnecting bridge unit lengths in 2D COF structures.
  • Characterization of solvent-induced structural changes and reversibility using advanced analytical techniques.

Main Results:

  • Developed 2D COFs exhibiting up to 85% solvent-induced volume expansion compared to their solvent-free state.
  • Demonstrated full reversibility of structural changes while maintaining crystalline order.
  • Established a versatile design strategy for dynamic 2D COFs.

Conclusions:

  • The developed 2D COFs represent a significant advancement in controllable framework expansion.
  • This design strategy enables tunable porosity and volume changes in 2D materials.
  • Potential applications in gas separation and chemical sensing are highlighted.