Unit-cell-thick zeolitic imidazolate framework films for membrane application.

Autor: Liu Q; Laboratory of Advanced Separations, École Polytechnique Fédérale de Lausanne (EPFL), Sion, Switzerland.; College of Chemistry, Chemical Engineering and Materials Science, Soochow University, Suzhou, China., Miao Y; Department of Chemical and Biomolecular Engineering & Institute for NanoBioTechnology, Johns Hopkins University, Baltimore, MD, USA., Villalobos LF; Laboratory of Advanced Separations, École Polytechnique Fédérale de Lausanne (EPFL), Sion, Switzerland.; Mork Family Department of Chemical Engineering and Materials Science, University of Southern California, Los Angeles, California, USA., Li S; Laboratory of Advanced Separations, École Polytechnique Fédérale de Lausanne (EPFL), Sion, Switzerland., Chi HY; Laboratory of Advanced Separations, École Polytechnique Fédérale de Lausanne (EPFL), Sion, Switzerland., Chen C; Advanced Membranes and Porous Materials Center, Physical Sciences and Engineering Division, King Abdullah University of Science and Technology, Thuwal, Saudi Arabia., Vahdat MT; Laboratory of Advanced Separations, École Polytechnique Fédérale de Lausanne (EPFL), Sion, Switzerland., Song S; Laboratory of Advanced Separations, École Polytechnique Fédérale de Lausanne (EPFL), Sion, Switzerland., Babu DJ; Laboratory of Advanced Separations, École Polytechnique Fédérale de Lausanne (EPFL), Sion, Switzerland.; Materials Science and Metallurgical Engineering, Indian Institute of Technology, Hyderabad, India., Hao J; Laboratory of Advanced Separations, École Polytechnique Fédérale de Lausanne (EPFL), Sion, Switzerland., Han Y; Advanced Membranes and Porous Materials Center, Physical Sciences and Engineering Division, King Abdullah University of Science and Technology, Thuwal, Saudi Arabia., Tsapatsis M; Department of Chemical and Biomolecular Engineering & Institute for NanoBioTechnology, Johns Hopkins University, Baltimore, MD, USA.; Applied Physics Laboratory, Johns Hopkins University, Laurel, MD, USA., Agrawal KV; Laboratory of Advanced Separations, École Polytechnique Fédérale de Lausanne (EPFL), Sion, Switzerland. kumar.agrawal@epfl.ch.
Jazyk: angličtina
Zdroj: Nature materials [Nat Mater] 2023 Nov; Vol. 22 (11), pp. 1387-1393. Date of Electronic Publication: 2023 Sep 21.
DOI: 10.1038/s41563-023-01669-z
Abstrakt: Zeolitic imidazolate frameworks (ZIFs) are a subset of metal-organic frameworks with more than 200 characterized crystalline and amorphous networks made of divalent transition metal centres (for example, Zn 2+ and Co 2+ ) linked by imidazolate linkers. ZIF thin films have been intensively pursued, motivated by the desire to prepare membranes for selective gas and liquid separations. To achieve membranes with high throughput, as in ångström-scale biological channels with nanometre-scale path lengths, ZIF films with the minimum possible thickness-down to just one unit cell-are highly desired. However, the state-of-the-art methods yield membranes where ZIF films have thickness exceeding 50 nm. Here we report a crystallization method from ultradilute precursor mixtures, which exploits registry with the underlying crystalline substrate, yielding (within minutes) crystalline ZIF films with thickness down to that of a single structural building unit (2 nm). The film crystallized on graphene has a rigid aperture made of a six-membered zinc imidazolate coordination ring, enabling high-permselective H 2 separation performance. The method reported here will probably accelerate the development of two-dimensional metal-organic framework films for efficient membrane separation.
(© 2023. The Author(s).)
Databáze: MEDLINE
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