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Related Experiment Video

Updated: May 7, 2025

Microfluidic-based Synthesis of Covalent Organic Frameworks COFs: A Tool for Continuous Production of COF Fibers and Direct Printing on a Surface

Microfluidic-based Synthesis of Covalent Organic Frameworks COFs: A Tool for Continuous Production of COF Fibers and Direct Printing on a Surface

Published on: July 10, 2017

2.5-dimensional covalent organic frameworks.

Tomoki Kitano^1,2, Syunto Goto^1,2, Xiaohan Wang^1,2

¹Laboratory for Zero-Carbon Energy, Institute of Integrated Research, Institute of Science Tokyo, Tokyo, Japan.

Nature Communications

|January 2, 2025

Summary

This summary is machine-generated.

Researchers developed 2.5-dimensional (2.5D) covalent organic frameworks (COFs) with large crystal sizes and high amine density. These novel COFs show promise for efficient carbon dioxide (CO2) capture, overcoming typical selectivity and adsorption heat trade-offs.

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Last Updated: May 7, 2025

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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Synthesis and Characterization of Functionalized Metal-organic Frameworks

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Published on: September 5, 2014

Area of Science:

Materials Science
Nanotechnology
Chemistry

Background:

Covalently bonded crystalline microporous materials, including two-dimensional (2D) and three-dimensional (3D) covalent organic frameworks (COFs), have diverse applications.
Synthesizing large, high-quality 2D COF crystals (>10 μm) is challenging, while 3D COFs are easier to produce in larger sizes with good crystallinity.

Purpose of the Study:

To introduce and characterize a new class of 2.5-dimensional (2.5D) covalent organic frameworks (COFs).
To demonstrate the potential of 2.5D COFs as advanced materials for carbon dioxide (CO2) adsorption.

Main Methods:

Development of 2.5D COF structures with microscopic 3D bonding and macroscopic 2D planar geometry.
Characterization of single-crystal sizes and the density/orientation of primary amine groups within the framework.

Main Results:

Achieved large single-crystal sizes for 2.5D COFs, exceeding 0.1 mm.
Engineered ultrahigh-density primary amine groups oriented perpendicular to the network plane.
Demonstrated simultaneous high CO2/N2 selectivity and low heat of adsorption in CO2 capture applications.

Conclusions:

2.5D COFs represent a novel structural motif in covalently bonded microporous materials.
The unique amine arrangement in 2.5D COFs enables efficient and selective CO2 adsorption.
This advancement is expected to expand the scope and applications of crystalline microporous systems.