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Related Concept Videos

Membrane Fluidity01:26

Membrane Fluidity

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Membrane fluidity is explained by the fluid mosaic model of the cell membrane, which describes the plasma membrane structure as a mosaic of components—including phospholipids, cholesterol, proteins, and carbohydrates—that gives the membrane a fluid character.
Mosaic nature of the membrane
The mosaic characteristic of the membrane helps the plasma membrane remain fluid. The integral proteins and lipids exist as separate but loosely-attached molecules in the membrane. The membrane is...
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Mechanisms of Membrane Domain Formation00:59

Mechanisms of Membrane Domain Formation

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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...
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Electrochemical Gradient and Channel Proteins: An Overview01:21

Electrochemical Gradient and Channel Proteins: An Overview

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An electrochemical gradient is a fundamental concept in biology and chemistry. It regulates the movement of ions across cell membranes. This movement is influenced by two factors:
The electrical gradient: The electrical gradient across cell membranes refers to the difference in electric charge between the inside and outside of a cell.  This difference drives the movement of ions towards or away from the cells. For instance, if the inside of the cell is more negatively charged relative to...
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Protein Diffusion in the Membrane01:24

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Proteins show rotational as well as lateral diffusion across the membrane. The lateral diffusion of proteins was confirmed through the cell fusion experiment where mouse and human cells were fused, resulting in hybrid cells. When the human and mouse cells fused, the specific membrane proteins on human and mouse cells were marked with the red and green-fluorescent markers, respectively. Initially, the red and green fluorescence was located on the respective hemisphere of the cell. As time...
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Mechanisms of Membrane-bending01:15

Mechanisms of Membrane-bending

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The living membranes are flexible due to their fluid mosaic nature; however, their bending into different shapes is an active process regulated by specific lipids and proteins. The membrane bending can be transient as seen in vesicles or stable for a long time as in microvilli. Cells regulate the size, location, and duration of the membrane curvature.
Membrane bending can happen due to intrinsic changes in lipid composition or extrinsic association with different proteins. The proteins involved...
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Membrane Domains01:18

Membrane Domains

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The membrane domains concentrate specific lipids and proteins at one place within the membrane, which helps in cell signaling, adhesion, and other critical cellular processes. These domains can differ in size, composition, function, and lifespan.
Protein Domains
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Related Experiment Video

Updated: Jul 16, 2025

Electrophoretic Crystallization of Ultrathin High-performance Metal-organic Framework Membranes
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Gradient Channel Segmentation in Covalent Organic Framework Membranes with Highly Oriented Nanochannels.

Xuechun Jing1, Mengxi Zhang1, Zhenjie Mu1

  • 1Beijing Key Laboratory of Photoelectronic/Electrophotonic Conversion Materials, Key Laboratory of Cluster Science, Ministry of Education, Advanced Technology Research Institute (Jinan), Frontiers Science Center for High Energy Material, School of Chemistry and Chemical Engineering, Beijing Institute of Technology, Beijing 100081, P. R. China.

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Summary

Researchers developed a new method to create COF membranes with aligned nanochannels for gas separation. This approach enhances H2/CO2 separation, surpassing previous limits by controlling functionality distribution.

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Area of Science:

  • Materials Science
  • Nanotechnology
  • Chemical Engineering

Background:

  • Covalent organic frameworks (COFs) are promising for membrane nanochannels due to tunable pores and functionalities.
  • Synthesizing COF membranes with oriented nanochannels and understanding postsynthetic modification effects remain challenging.

Purpose of the Study:

  • To develop a method for synthesizing COF membranes with highly oriented mesoporous channels.
  • To investigate the influence of postsynthetic modification on functionality distribution within nanochannels.
  • To achieve high-performance gas separation using tailored COF membranes.

Main Methods:

  • Introduced a "prenucleation and slow growth" approach for COF membrane synthesis.
  • Utilized "click" reactions to anchor functional moieties to pore walls.
  • Coordinated functional moieties with Cu ions for segmentation functions.

Main Results:

  • Synthesized a COF membrane with highly oriented mesoporous channels and a high surface area (2230 m² g⁻¹).
  • Achieved remarkable H₂/CO₂ separation performance exceeding the Robeson upper bound.
  • Demonstrated that functionality distribution is influenced by moiety flexibility and reaction rate.

Conclusions:

  • The "prenucleation and slow growth" strategy enables precise design of COF-based artificial solid-state nanochannels.
  • Controlled functionality distribution is key to optimizing COF membrane performance for separation applications.
  • This work provides a pathway for constructing advanced COF membranes with tailored channel environments.