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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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Colloidal Covalent Organic Frameworks.

Brian J Smith1, Lucas R Parent2, Anna C Overholts3

  • 1Department of Chemistry and Chemical Biology and Department of Materials Science and Engineering, Cornell University, Ithaca, New York 14853, United States; Department of Chemistry, Bucknell University, Lewisburg, Pennsylvania 17837, United States.

ACS Central Science
|February 3, 2017
PubMed
Summary
This summary is machine-generated.

Researchers developed a new method for synthesizing covalent organic frameworks (COFs) nanoparticles. This breakthrough enables the creation of processable COF films with controlled structures for advanced applications.

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Area of Science:

  • Materials Science
  • Polymer Chemistry
  • Nanotechnology

Background:

  • Covalent organic frameworks (COFs) are porous polymers with applications in catalysis, optoelectronics, and energy storage.
  • Current COF synthesis methods yield insoluble powders, limiting their processability and hindering fundamental understanding.
  • Heterogeneous reaction conditions in COF synthesis impede control over morphology and final form.

Purpose of the Study:

  • To develop homogeneous polymerization conditions for 2D COFs.
  • To achieve control over COF nanoparticle size and morphology.
  • To enable the fabrication of processable COF materials for device applications.

Main Methods:

  • Homogeneous polymerization of boronate ester-linked 2D COFs.
  • Characterization using small-angle and wide-angle X-ray scattering.
  • In situ variable-temperature liquid cell transmission electron microscopy (VT-LCTEM) for real-time monitoring of nanoparticle growth.

Main Results:

  • Stable colloidal suspensions of 2D COF nanoparticles were successfully synthesized.
  • Nanoparticle size was modulated by solvent conditions.
  • Solution casting of colloids produced transparent, free-standing COF films with retained crystallinity and porosity.

Conclusions:

  • Homogeneous polymerization offers unprecedented control over COF morphology.
  • The developed method overcomes limitations of traditional COF synthesis.
  • This approach opens new avenues for COF material design and device integration.