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  Unidirectional ion transport in nanoporous carbon membranes with a hierarchical pore architecture

Chen, L., Tu, B., Lu, X., Li, F., Jiang, L., Antonietti, M., et al. (2021). Unidirectional ion transport in nanoporous carbon membranes with a hierarchical pore architecture. Nature Communications, 12: 4650. doi:10.1038/s41467-021-24947-3.

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 Creators:
Chen, Lu1, Author           
Tu, Bin, Author
Lu, Xubin, Author
Li, Fan, Author
Jiang, Lei, Author
Antonietti, Markus1, Author           
Xiao, Kai2, Author           
Affiliations:
1Markus Antonietti, Kolloidchemie, Max Planck Institute of Colloids and Interfaces, Max Planck Society, ou_1863321              
2Kolloidchemie, Max Planck Institute of Colloids and Interfaces, Max Planck Society, ou_1863288              

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Free keywords: nanofluids, nanoscale materials
 Abstract: The transport of fluids in channels with diameter of 1-2 nm exhibits many anomalous features due to the interplay of several genuinely interfacial effects. Quasi-unidirectional ion transport, reminiscent of the behavior of membrane pores in biological cells, is one phenomenon that has attracted a lot of attention in recent years, e.g., for realizing diodes for ion-conduction based electronics. Although ion rectification has been demonstrated in many asymmetric artificial nanopores, it always fails in the high-concentration range, and operates in either acidic or alkaline electrolytes but never over the whole pH range. Here we report a hierarchical pore architecture carbon membrane with a pore size gradient from 60 nm to 1.4 nm, which enables high ionic rectification ratios up to 104 in different environments including high concentration neutral (3 M KCl), acidic (1 M HCl), and alkaline (1 M NaOH) electrolytes, resulting from the asymmetric energy barriers for ions transport in two directions. Additionally, light irradiation as an external energy source can reduce the energy barriers to promote ions transport bidirectionally. The anomalous ion transport together with the robust nanoporous carbon structure may find applications in membrane filtration, water desalination, and fuel cell membranes.

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Language(s): eng - English
 Dates: 2021-07-302021
 Publication Status: Published in print
 Pages: -
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 Rev. Type: -
 Identifiers: DOI: 10.1038/s41467-021-24947-3
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Title: Nature Communications
  Abbreviation : Nat. Commun.
Source Genre: Journal
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Publ. Info: London : Nature Publishing Group
Pages: - Volume / Issue: 12 Sequence Number: 4650 Start / End Page: - Identifier: ISSN: 2041-1723