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

Journal Article · · Science

Fast water transport through carbon nanotube pores has raised the possibility to use them in the next generation of water treatment technologies. In this paper, 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. Lastly, these properties make CNTPs a promising material for developing membrane separation technologies.

Research Organization:
Lawrence Livermore National Laboratory (LLNL), Livermore, CA (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES); USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22). Materials Sciences & Engineering Division
Grant/Contract Number:
AC52-07NA27344; AC02-05CH11231
OSTI ID:
1434817
Alternate ID(s):
OSTI ID: 1466168
Report Number(s):
LLNL-JRNL-725791; /sci/357/6353/792.atom
Journal Information:
Science, Journal Name: Science Vol. 357 Journal Issue: 6353; ISSN 0036-8075
Publisher:
AAASCopyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 502 works
Citation information provided by
Web of Science

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