Volume 59, Issue 12 pp. 4840-4845
Communication

Precise Size-Selective Sieving of Nanoparticles Using a Highly Oriented Two-Dimensional Supramolecular Polymer

Dr. Zhen Chen

Dr. Zhen Chen

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

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Prof. Dr. Vivian Wing-Wah Yam

Corresponding Author

Prof. Dr. Vivian Wing-Wah Yam

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

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First published: 21 December 2019
Citations: 25

Graphical Abstract

Sub-nm sieving: A flexible supramolecular membrane for the sub-nanometer sieving of nanoparticles is developed. This membrane comprises a highly oriented, honeycomb-like, two-dimensional supramolecular polymer with uniform nanocavities. Owing to this unique structural feature, a precise cutoff size of about 4 nm has been realized.

Abstract

The development of size-selective membranes with well-defined nanopores towards the precise separation of nanometer-sized substances is a challenging task to achieve. Here a supramolecular membrane is presented that comprises a highly oriented, honeycomb-like, 2D supramolecular polymer on a polycarbonate filter support. It enables precise size-selective sieving of colloidal nanoparticles (NPs). Owing to the uniform parallel-aligned nanocavities within the 2D supramolecular polymers, the composite membrane shows a high size-selectivity with a sub-nanometer accuracy in the cutoff size of about 4.0 nm. In principle, the species of size-separable particles are unlimited, as demonstrated by quantum dots, noble metal, and metal oxide NPs. This supramolecular membrane combined with filtration advances the potential of NPs in terms of their monochromatic emission and size monodispersity, and also enables rapid removal of small magnetic NP adsorbents that are otherwise difficult to capture.

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