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Mechanisms of Membrane Domain Formation00:59

Mechanisms of Membrane Domain Formation

3.0K
Different physical properties of lipids and proteins allow them to localize and form distinct islands or domains in the membrane. Some membrane domains are formed due to protein-protein interactions, whereas others are formed due to the presence of specific lipids such as sphingolipids and sterols—for example, large proteins, such as bacteriorhodopsin, aggregate and create distinct domains.
Another mechanism for membrane domain formation involves membrane proteins interacting with...
3.0K
Fluid Mosaic Model01:19

Fluid Mosaic Model

11.7K
Scientists identified the plasma membrane in the 1890s and its principal chemical components (lipids and proteins) by 1915. The model for plasma membrane structure, proposed in 1935 by Hugh Davson and James Danielli, was the first model to be widely accepted in the scientific community. The model was based on the plasma membrane's "railroad track" appearance in early electron micrographs. Davson and Danielli theorized that the plasma membrane's structure resembled a sandwich...
11.7K
Membrane Fluidity01:23

Membrane Fluidity

152.3K
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.
152.3K
Hydrogen Bonds01:04

Hydrogen Bonds

8.5K
A hydrogen bond is formed when a weakly positive hydrogen atom already bonded to one electronegative atom (for example, the oxygen in the water molecule) is attracted to another electronegative atom from another polar molecule, such as water (H2O), hydrogen fluoride (HF), or ammonia (NH3). The huge electronegativity difference between the H atom (2.1) and the atom to which it is bonded (4.0 for an F atom, 3.5 for an O atom, or 3.0 for an N atom), combined with the very small size of an H atom...
8.5K
Entropy and Solvation02:05

Entropy and Solvation

7.1K
The process of surrounding a solute with solvent is called solvation. It involves evenly distributing the solute within the solvent. The rule of thumb for determining a solvent for a given compound is that like dissolves like. A good solvent has molecular characteristics similar to those of the compound to be dissolved. For example, polar solutions dissolve polar solutes, and apolar solvents dissolve apolar solutes. A polar solvent is a solvent that has a high dielectric constant (ϵ...
7.1K
Detergent Purification of Membrane Proteins01:18

Detergent Purification of Membrane Proteins

5.2K
Detergents are used to purify the integral proteins of the membrane. The hydrophobic portion of the detergent can replace membrane phospholipids while solubilizing the membrane proteins. When detergent monomers reach a specific concentration in a solution called critical micelle concentration (CMC), they form micelles. Above CMC, the concentration of the detergent monomers remains in equilibrium with the micelle. The number of detergent monomers present in the CMC varies for each detergent, and...
5.2K

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Updated: Jul 4, 2025

Electrophoretic Crystallization of Ultrathin High-performance Metal-organic Framework Membranes
07:45

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

Published on: August 16, 2018

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Hydrogen-bonded organic frameworks for membrane separation.

Cheng Chen1, Liguo Shen1, Hongjun Lin1

  • 1College of Geography and Environmental Sciences, Zhejiang Normal University, Jinhua 321004, China. lgshen@zjnu.cn.

Chemical Society Reviews
|February 9, 2024
PubMed
Summary

Hydrogen-bonded organic frameworks (HOFs) offer tunable properties for advanced membrane separations. These materials show promise in gas separation, water treatment, and fuel cells due to their flexibility and self-healing capabilities.

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Area of Science:

  • Materials Science
  • Chemical Engineering
  • Nanotechnology

Background:

  • Hydrogen-bonded organic frameworks (HOFs) are emerging crystalline porous materials.
  • HOFs are constructed from organic or metal-organic units linked by hydrogen bonds.
  • Their unique properties include flexibility, reversibility, and mild synthesis conditions.

Purpose of the Study:

  • To provide an overview of recent advancements in HOF-based membranes.
  • To discuss fabrication strategies and applications of HOF membranes in separation technologies.
  • To highlight key factors influencing HOF membrane performance and future directions.

Main Methods:

  • Review of fabrication strategies: blending, in situ growth, solution-processing, and electrophoretic deposition.
  • Analysis of critical factors for HOF membrane design: pore size, stability, surface properties.
  • Examination of diverse applications in membrane separation.

Main Results:

  • HOF-based membranes exhibit desirable properties like solvent processability and self-healing.
  • Fabrication methods allow for tailored HOF membrane characteristics.
  • Successful applications demonstrated in gas separation, water treatment, and fuel cells.

Conclusions:

  • HOF-based membranes represent a promising platform for various separation applications.
  • Further research is needed to overcome challenges and fully realize their potential.
  • Continued development in fabrication and material design will drive innovation in HOF membrane technology.