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Membrane Fluidity01:23

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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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Electrophoretic Crystallization of Ultrathin High-performance Metal-organic Framework Membranes
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Fluoropolymer Membranes for Membrane Distillation and Membrane Crystallization.

Xue Li1,2, Jun Pan3, Francesca Macedonio1

  • 1Institute on Membrane Technology, ITM-CNR, Via P. Bucci 17/C, 87036 Arcavacata di Rende, Italy.

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|December 23, 2022
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Summary

This review explores hydrophobic fluoropolymer membranes for membrane distillation and crystallization. It details preparation and modification methods to enhance membrane performance and longevity, addressing wetting and fouling issues.

Keywords:
fluoropolymer membraneshydrophobic modificationmembrane crystallizationmembrane distillation

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Area of Science:

  • Materials Science
  • Chemical Engineering
  • Separation Technology

Background:

  • Fluoropolymer membranes are crucial in membrane distillation and crystallization, acting as hydrophobic barriers.
  • These processes face challenges like membrane wetting, fouling, and scaling, which reduce efficiency and lifespan.
  • Loss of hydrophobicity is a primary cause of membrane wetting, impacting mass transfer and separation.

Purpose of the Study:

  • To review preparation methods for hydrophobic fluoropolymer membranes.
  • To summarize hydrophobic modification strategies for these membranes.
  • To discuss advances in using less toxic solvents for membrane preparation.

Main Methods:

  • Summarizes established preparation techniques: non-solvent-induced phase separation (NIPS), thermally-induced phase separation (TIPS), and vapor-induced phase separation (VIPS).
  • Details hydrophobic modification approaches including surface coating, surface grafting, and blending.
  • Reviews research on environmentally friendly solvent applications.

Main Results:

  • Fluoropolymer membranes offer high chemical and thermal resistance, making them suitable for demanding applications.
  • Various preparation and modification methods can significantly improve membrane hydrophobicity and performance.
  • The use of less toxic solvents is an emerging trend in developing sustainable membrane technologies.

Conclusions:

  • Hydrophobic fluoropolymer membranes are vital for advancing membrane distillation and crystallization.
  • Continued research into preparation and modification techniques is essential for overcoming operational challenges.
  • This review provides a comprehensive guide for future development in fluoropolymer membrane technology.