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Related Concept Videos

Filtration00:53

Filtration

Filtration is a physical separation process that involves passing a suspension through a porous medium to separate solids from fluids. During filtration, solids collect on the porous medium while liquids, also collectively known as the filtrate, pass through. The filtration medium is selected based on the filtration purpose, quantity, and nature of the precipitate. The general criteria for a suitable filtering medium are that it is inert, mechanically strong, nonabsorbent toward dissolved...
Ion Exchange01:17

Ion Exchange

Ion exchange chromatography separates charged molecules from a solution by reversibly exchanging them with mobile, or 'active', ions associated with the oppositely charged stationary phase. This method can be used to separate ions, soften and deionize water, and purify solutions. The polymers comprising the ion-exchange column are high-molecular-weight and chemically stable polymers, crosslinked to be porous and essentially insoluble. They are also functionalized with either acidic or basic...
High-Performance Liquid Chromatography: Introduction01:11

High-Performance Liquid Chromatography: Introduction

High-performance liquid chromatography(HPLC), formerly referred to as High-pressure liquid chromatography, is a powerful technique used to separate, identify, and quantify components in complex mixtures. The term "high pressure" refers to using high pressure to push the liquid mobile phase through the tightly packed columns.
In HPLC, two phases play a critical role in the separation process:
High-Performance Liquid Chromatography: Elution Process01:05

High-Performance Liquid Chromatography: Elution Process

In High-Performance Liquid Chromatography (HPLC), the elution process is critical to the separation of analytes and the quality of chromatographic results. Elution describes how compounds move through the column and separate based on their interactions with the mobile and stationary phases. This process determines the resolution, peak shape, and retention times in the chromatogram, which are essential for identifying and quantifying components in complex mixtures. Understanding the elution...
Supercritical Fluid Chromatography01:18

Supercritical Fluid Chromatography

Supercritical fluid chromatography (SFC) provides a beneficial substitute for gas chromatography (GC) and liquid chromatography (LC) for certain samples because it merges the top attributes of both techniques. SFC allows the separation and analysis of compounds that GC or LC does not easily manage. These compounds are traditionally nonvolatile or thermally unstable, making GC unsuitable and lacking functional groups required for HPLC analysis.
SFC utilizes a supercritical fluid mobile phase,...
Capillary Electrophoresis: Applications01:30

Capillary Electrophoresis: Applications

Capillary electrophoretic separations offer various modes, each with unique applications. These modes include capillary zone electrophoresis, capillary gel electrophoresis, capillary array electrophoresis, capillary isoelectric focusing, capillary isotachophoresis, micellar electrokinetic chromatography, and capillary electrochromatography.
Capillary zone electrophoresis (CZE) separates ionic components based on their electrophoretic mobility. It has been used to separate proteins, amino acids,...

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Related Experiment Video

Updated: Jun 14, 2026

Preparation of Light-responsive Membranes by a Combined Surface Grafting and Postmodification Process
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Solid-solvent processing of ultrathin, highly loaded mixed-matrix membrane for gas separation.

Guining Chen1, Cailing Chen2, Yanan Guo1

  • 1State Key Laboratory of Materials-Oriented Chemical Engineering, College of Chemical Engineering, Nanjing Tech University, Nanjing 211800, China.

Science (New York, N.Y.)
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Summary

Researchers developed ultrathin mixed-matrix membranes (MMMs) using a novel solid-solvent method. These advanced MMMs achieve superior gas separation performance, even at high filler concentrations.

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Area of Science:

  • Materials Science
  • Chemical Engineering
  • Nanotechnology

Background:

  • Mixed-matrix membranes (MMMs) offer potential for molecular separation by combining polymers with fillers.
  • Challenges include controlling interfacial compatibility and achieving ultrathin selective layers, especially at high filler loadings.

Purpose of the Study:

  • To develop a novel processing strategy for fabricating ultrathin MMMs with high filler loading.
  • To enhance the gas separation performance of MMMs.

Main Methods:

  • A solid-solvent processing strategy was employed using polymer as a solvent for metal salts.
  • This formed an ultrathin precursor layer, immobilizing metal salts and controlling their conversion to metal-organic frameworks (MOFs).
  • The method facilitated MOF adhesion within the polymer matrix.

Main Results:

  • Fabrication of ultrathin MMMs with thicknesses below 100 nanometers and filler loading up to 80 volume %.
  • The resulting membranes demonstrated significantly enhanced gas-sieving properties.
  • Achieved hydrogen permeance and/or hydrogen-carbon dioxide selectivity one to two orders of magnitude higher than state-of-the-art membranes.

Conclusions:

  • The solid-solvent processing strategy is effective for creating high-performance ultrathin MMMs.
  • This approach overcomes limitations in interfacial compatibility and processing of MMMs at high filler loadings.
  • The developed MMMs show exceptional potential for advanced gas separation applications.