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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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Related Experiment Video

Updated: Jul 4, 2025

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

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Published on: August 16, 2018

Temperature-Responsive Separation Membrane with High Antifouling Performance for Efficient Separation.

Tong Ji¹, Yuan Ji¹, Xiangli Meng¹

¹School of Chemistry and Chemical Engineering, Harbin Institute of Technology, Harbin 150001, China.

|February 10, 2024

Summary

This summary is machine-generated.

Modified polyvinylidene fluoride (PVDF) membranes with temperature-responsive copolymers and graphene oxide (GO) show enhanced separation properties. This innovation improves efficiency and extends membrane lifespan for advanced separation applications.

Keywords:

PVDF PVDF-g-NIPAAm graphene oxide separation membrane temperature-responsive

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Last Updated: Jul 4, 2025

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Published on: August 16, 2018

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Published on: April 7, 2017

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Published on: March 1, 2020

Area of Science:

Materials Science
Polymer Chemistry
Separation Technology

Background:

Temperature-responsive membranes offer dynamic control over permeability and separation.
Polyvinylidene fluoride (PVDF) is a widely used polymer in membrane technology.
Modifying existing membranes can enhance performance and reduce operational costs.

Purpose of the Study:

To develop novel temperature-responsive separation membranes based on PVDF.
To investigate the effect of incorporating amphiphilic temperature-responsive copolymers and graphene oxide (GO) into PVDF membranes.
To optimize membrane properties for improved separation efficiency and antifouling performance.

Main Methods:

Synthesized an amphiphilic temperature-responsive copolymer by side-linking hydrophilic poly(N-isopropyl acrylamide) (PNIPAAm) to a hydrophobic PVDF skeleton (PVDF-g-PNIPAAm).
Prepared modified membranes by blending PVDF with the synthesized PVDF-g-PNIPAAm copolymer and graphene oxide (GO).
Varied the NIPAAm grafting ratio and the blending ratios to study their effects on membrane properties.

Main Results:

Successfully prepared temperature-responsive polymers with tunable NIPAAm grafting ratios.
Demonstrated that blending PVDF-g-PNIPAAm and GO enhanced the membrane's internal structure and antifouling capabilities.
Observed that the addition of GO and PVDF-g-PNIPAAm formed a stable hydrogen bond network, improving membrane performance without compromising temperature responsiveness.

Conclusions:

PVDF-g-PNIPAAm copolymers and GO can be effectively integrated into PVDF membranes to create advanced temperature-responsive separation systems.
The developed membranes exhibit improved structural integrity and antifouling properties, leading to extended service life.
This approach offers a promising strategy for enhancing the efficiency and cost-effectiveness of separation processes.