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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...
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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.
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Related Experiment Video

Updated: Dec 20, 2025

Electrophoretic Crystallization of Ultrathin High-performance Metal-organic Framework Membranes
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Two-Dimensional Supramolecular Ionic Frameworks for Precise Membrane Separation of Small Nanoparticles.

Yan Zhou1, Guohua Zhang1, Bao Li1

  • 1State Key Laboratory of Supramolecular Structure and Materials, College of Chemistry, Jilin University, Changchun 130012, P. R. China.

ACS Applied Materials & Interfaces
|May 29, 2020
PubMed
Summary
This summary is machine-generated.

Researchers developed flexible 2D supramolecular ionic frameworks (SIFs) for advanced separations. These novel porous materials enable precise nanofiltration of nanoparticles and molecular clusters down to 2.2 nm.

Keywords:
filtrationmembranenanoseparationself-assemblysupramolecular framework

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Area of Science:

  • Materials Science
  • Supramolecular Chemistry
  • Nanotechnology

Background:

  • Supramolecular frameworks offer advantages over traditional porous materials due to their flexibility and stimuli-responsive nature.
  • Intermolecular interactions drive the assembly of these novel materials, enabling unique processing and recycling capabilities.

Purpose of the Study:

  • To construct a novel two-dimensional (2D) supramolecular ionic framework (SIF).
  • To investigate the processability and application of the SIF in separation membranes.
  • To demonstrate the precise separation of nanoparticles and molecular clusters using the developed framework.

Main Methods:

  • Construction of a 2D SIF via ionic interactions between a host cation and a polyoxometalate polyanion.
  • Host-guest inclusion of the ionic complex with a four-arm porphyrin guest molecule using a [2+4] reaction.
  • Preparation of separation membranes from the SIF nanosheets via a simple suction procedure.

Main Results:

  • A flexible, nanosheet-like assembly with an orthometric grid structure was successfully synthesized.
  • The SIF-based membranes exhibited processability and enabled nanofiltration under slightly reduced pressure.
  • Precise separation of nanoparticles and molecular clusters with a cutoff value as small as 2.2 nm was achieved.

Conclusions:

  • The developed 2D SIF strategy offers a viable route for creating processable separation membranes.
  • The framework's uniform pores facilitate highly selective nanofiltration, demonstrating potential for molecular-level separations.
  • This approach opens avenues for advanced nanoscale separation technologies.