Journal article

Efficient metal ion sieving in rectifying subnanochannels enabled by metal-organic frameworks

Jun Lu, Huacheng Zhang, Jue Hou, Xingya Li, Xiaoyi Hu, Yaoxin Hu, Christopher D Easton, Qinye Li, Chenghua Sun, Aaron W Thornton, Matthew R Hill, Xiwang Zhang, Gengping Jiang, Jefferson Zhe Liu, Anita J Hill, Benny D Freeman, Lei Jiang, Huanting Wang

Nature Materials | Nature Research | Published : 2020

Abstract

Biological ion channels have remarkable ion selectivity, permeability and rectification properties, but it is challenging to develop artificial analogues. Here, we report a metal–organic framework-based subnanochannel (MOFSNC) with heterogeneous structure and surface chemistry to achieve these properties. The asymmetrically structured MOFSNC can rapidly conduct K+, Na+ and Li+ in the subnanometre-to-nanometre channel direction, with conductivities up to three orders of magnitude higher than those of Ca2+ and Mg2+, equivalent to a mono/divalent ion selectivity of 103. Moreover, by varying the pH from 3 to 8 the ion selectivity can be tuned further by a factor of 102 to 104. Theoretical simula..

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University of Melbourne Researchers

Grants

Awarded by Australian Research Council


Awarded by National Natural Science Foundation of China


Awarded by Center for Materials for Water and Energy Systems (M-WET), an Energy Frontier Research Center - US Department of Energy, Office of Science, Office of Basic Energy Sciences


Funding Acknowledgements

This project is supported by the Australian Research Council (grant nos. DP180100298, DE170100006, DP170102964 and DP180102890). J.L. thanks the Chinese Scholarship Council for a PhD scholarship. J.Z.L. thanks the start-up fund from The University of Melbourne. G.J. thanks the National Natural Science Foundation of China (grant no. 21905215) for support. B.D.F.'s work is supported by the Center for Materials for Water and Energy Systems (M-WET), an Energy Frontier Research Center funded by the US Department of Energy, Office of Science, Office of Basic Energy Sciences under Award No. DE-SC0019272. We acknowledge assistance from B.Qian and X.Chen in the experiments and use of the facilities and assistance from Y.Chen and X.Fang in the Monash Center for Electron Microscopy. We also acknowledge the assistance of resources and services from the National Computational Infrastructure, which is supported by the Australian Government. We acknowledge the assistance of P. Cook in editing the manuscript.