Enhanced water permeability and tunable ion selectivity in subnanometer carbon nanotube porins

Ramya H. Tunuguntla, Robert Y. Henley, Yun Chiao Yao, Tuan Anh Pham, Meni Wanunu, Aleksandr Noy

Research output: Contribution to journalArticle

154 Scopus citations

Abstract

Fast water transport through carbon nanotube pores has raised the possibility to use them in the next generation of water treatment technologies. We report that water permeability in 0.8-nanometer-diameter carbon nanotube porins (CNTPs), which confine water down to a single-file chain, exceeds that of biological water transporters and of wider CNT pores by an order of magnitude. Intermolecular hydrogen-bond rearrangement, required for entry into the nanotube, dominates the energy barrier and can be manipulated to enhance water transport rates. CNTPs block anion transport, even at salinities that exceed seawater levels, and their ion selectivity can be tuned to configure them into switchable ionic diodes. These properties make CNTPs a promising material for developing membrane separation technologies.

Original languageEnglish (US)
Pages (from-to)792-796
Number of pages5
JournalScience
Volume357
Issue number6353
DOIs
StatePublished - Aug 25 2017
Externally publishedYes

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ASJC Scopus subject areas

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Cite this

Tunuguntla, R. H., Henley, R. Y., Yao, Y. C., Pham, T. A., Wanunu, M., & Noy, A. (2017). Enhanced water permeability and tunable ion selectivity in subnanometer carbon nanotube porins. Science, 357(6353), 792-796. https://doi.org/10.1126/science.aan2438