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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: Jun 4, 2025

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

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

Published on: August 16, 2018

Solvent-responsive covalent organic framework membranes for precise and tunable molecular sieving.

Hao Yang^1,2,3, Haoyuan Zhang¹, Chengjun Kang¹

¹Department of Chemical and Biomolecular Engineering, National University of Singapore, 4 Engineering Drive 4, Singapore 117585, Singapore.

Science Advances

|December 18, 2024

Summary

We developed flexible covalent organic framework (COF) membranes for organic solvent nanofiltration. These smart membranes offer high selectivity and permeance, overcoming limitations of current technologies.

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Synthesis and Characterization of Functionalized Metal-organic Frameworks

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Last Updated: Jun 4, 2025

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

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Published on: August 16, 2018

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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Published on: July 10, 2017

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
Separation Science

Background:

Membrane-based nanofiltration is crucial for organic solvent treatment.
Current membranes face challenges like low permeability and poor chemical resistance.

Purpose of the Study:

To develop advanced covalent organic framework (COF) membranes with tunable properties.
To address limitations of conventional membranes in organic solvent nanofiltration.

Main Methods:

Fabrication of covalent organic framework (COF) membranes.
Investigating solvent-responsive structural flexibility.
Characterization of membrane performance in organic solvent nanofiltration.

Main Results:

Achieved high rejection rates (>99%) and permeance (>15 kg m⁻² h⁻¹ bar⁻¹).
Demonstrated excellent organic solvent resistance and selectivity due to sub-nanopore formation.
COF membranes exhibit solvent-responsive structural flexibility.

Conclusions:

The developed COF membranes represent a significant advancement in organic solvent nanofiltration.
These membranes offer a promising solution for large-scale solvent treatment applications.
Smart COF membranes provide tunable selectivity and high performance.