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1.
Nat Commun ; 12(1): 5231, 2021 09 01.
Artigo em Inglês | MEDLINE | ID: mdl-34471132

RESUMO

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 Ca2 + , which is nearly two orders of magnitude higher than the biological one, and 1128 against Mg2 + . 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.

2.
Chem Commun (Camb) ; 57(58): 7152-7155, 2021 Jul 20.
Artigo em Inglês | MEDLINE | ID: mdl-34184013

RESUMO

Glass micropipettes are easy to fabricate, have excellent flexibility and stable properties. HKUST-1 and MIL-68(In) are in situ grown in the tip of a micropipette to construct porous nanochannels. After absorbing H2S, the MIL-68(In)-based nanochannel shows effective metal ion responsiveness for Hg2+-detection.


Assuntos
Sulfeto de Hidrogênio/análise , Estruturas Metalorgânicas/química , Adsorção , Vidro/química , Sulfeto de Hidrogênio/isolamento & purificação , Nanoestruturas/química , Porosidade
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