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Membrane Fluidity

Membrane Fluidity

Cell membranes are composed of phospholipids, proteins, and carbohydrates loosely attached to one another through chemical interactions. Molecules are generally able to move about in the plane of the membrane, giving the membrane its flexible nature called fluidity. Two other features of the membrane contribute to membrane fluidity: the chemical structure of the phospholipids and the presence of cholesterol in the membrane.

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Updated: Sep 1, 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

Missing-linker Defects in Covalent Organic Framework Membranes for Efficient CO₂ Separation.

Zheyuan Guo^1,2, Hong Wu^1,2,3, Yu Chen^2,4

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

Angewandte Chemie (International Ed. in English)

|August 18, 2022

Summary

This study introduces defect engineering to create covalent organic framework (COF) membranes for efficient carbon dioxide (CO2) separation. The novel membranes exhibit high CO2 permeance and selectivity, offering a promising solution for gas separations.

Keywords:

Amino Functionalization CO2 Separation Covalent Organic Frameworks Defect Engineering Strategy Facilitated Transport Membrane

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Synthesis and Characterization of Functionalized Metal-organic Frameworks

Published on: September 5, 2014

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Last Updated: Sep 1, 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

Electrophoretic Crystallization of Ultrathin High-performance Metal-organic Framework Membranes

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Published on: August 16, 2018

Synthesis and Characterization of Functionalized Metal-organic Frameworks

Synthesis and Characterization of Functionalized Metal-organic Frameworks

Published on: September 5, 2014

Area of Science:

Materials Science
Chemical Engineering
Nanotechnology

Background:

Covalent organic framework (COF) membranes offer tunable channels and functional groups for molecular separations.
The synergy of physical and chemical microenvironments in COFs is crucial for separation performance.

Purpose of the Study:

To develop a defect engineering strategy for fabricating COF membranes.
To enhance CO2 separation efficiency using COF membranes with abundant amino groups.

Main Methods:

Fabrication of COF membranes using a defect engineering strategy.
In situ generation of amino groups on COF nanosheets via missing-linker defects during monomer assembly.
Assembly of COF nanosheets into membranes for gas separation testing.

Main Results:

Generated abundant in situ amino groups on COF nanosheets, acting as CO2 facilitated transport carriers.
Achieved high CO2 permeance (>300 GPU) and excellent selectivity for CO2/N2 (80) and CO2/CH4 (54) under humid conditions.
Demonstrated the effectiveness of defect engineering for incorporating functional groups in COF membranes.

Conclusions:

The defect engineering strategy provides a facile approach to creating functionalized COF membranes.
The developed COF membranes show significant promise for efficient CO2 separation applications.
This method can be extended to other organic framework membranes for diverse chemical separations.