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Biological sodium channels ferry sodium ions across the lipid membrane while rejecting potassium ions and other metal ions. Realizing such ion selectivity in an artificial solid-state ionic device will enable new separation technologies but remains highly challenging. In this work, we report an artificial sodium-selective ionic device, built on synthesized porous crown-ether crystals which consist of densely packed 0.26-nm-wide pores. The Na +  selectivity of the artificial sodium-selective ionic device reached 15 against K  +  , which is comparable to the biological counterpart, 523 against Ca 2 +  , which is nearly two orders of magnitude higher than the biological one, and 1128 against Mg 2 +  . The selectivity may arise from the size effect and molecular recognition effect. This work may contribute to the understanding of the structure-performance relationship of ion selective nanopores.

Artificial sodium-selective ionic device based on crown-ether crystals with subnanometer pores