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Related Concept Videos

Size-Exclusion Chromatography01:08

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In size-exclusion chromatography (SEC), also known as molecular-exclusion or gel-permeation chromatography, molecules are separated based on their sizes. This technique is important for separating large molecules such as polymers and biomolecules. The two classes of micron-sized stationary phases encountered in SEC are silica particles and cross-linked polymer resin beads. Both materials are porous, but their pore sizes vary significantly.
Silica particles offer advantages such as rigidity,...
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Precise Size-Selective Sieving of Nanoparticles Using a Highly Oriented Two-Dimensional Supramolecular Polymer.

Zhen Chen1, Vivian Wing-Wah Yam1

  • 1Institute of Molecular Functional Materials and Department of Chemistry, The University of Hong Kong, Pokfulam Road, Hong Kong, P. R. China.

Angewandte Chemie (International Ed. in English)
|December 22, 2019
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Summary

A novel supramolecular membrane with uniform nanocavities precisely separates nanometer-sized particles. This breakthrough enables advanced applications for nanoparticles (NPs) and efficient removal of magnetic NP adsorbents.

Keywords:
2D supramolecular polymersfiltrationmembranesnanoparticlessize-selectivity

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Area of Science:

  • Materials Science
  • Nanotechnology
  • Polymer Chemistry

Background:

  • Developing size-selective membranes for precise separation of nanometer-sized substances is challenging.
  • Existing membranes often lack the required precision and uniformity in pore size.

Purpose of the Study:

  • To present a novel supramolecular membrane for highly accurate size-selective sieving of colloidal nanoparticles (NPs).
  • To demonstrate the membrane's capability in advancing nanoparticle applications and improving separation processes.

Main Methods:

  • Fabrication of a composite membrane using a highly oriented, honeycomb-like, 2D supramolecular polymer on a polycarbonate filter support.
  • Characterization of the membrane's structure and performance in separating various types of nanoparticles.

Main Results:

  • The supramolecular membrane exhibits uniform, parallel-aligned nanocavities, enabling precise size-selective sieving.
  • Achieved high size-selectivity with sub-nanometer accuracy in cutoff size (approx. 4.0 nm).
  • Demonstrated successful separation of diverse nanoparticles, including quantum dots, noble metal, and metal oxide NPs.

Conclusions:

  • The developed supramolecular membrane offers a powerful tool for precise nanoparticle separation.
  • Enhances nanoparticle properties like monochromatic emission and size monodispersity.
  • Facilitates efficient capture of challenging magnetic nanoparticle adsorbents.