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

Autor: Tunuguntla RH; Biology and Biotechnology Division, Physical and Life Sciences Directorate, Lawrence Livermore National Laboratory, Livermore, CA 94550, USA., Henley RY; Biology and Biotechnology Division, Physical and Life Sciences Directorate, Lawrence Livermore National Laboratory, Livermore, CA 94550, USA.; Physics Department, Northeastern University, Boston, MA 02115, USA., Yao YC; Biology and Biotechnology Division, Physical and Life Sciences Directorate, Lawrence Livermore National Laboratory, Livermore, CA 94550, USA.; School of Natural Sciences, University of California Merced, Merced, CA 94343, USA., Pham TA; Materials Science Division, Physical and Life Sciences Directorate, Lawrence Livermore National Laboratory, Livermore, CA 94550, USA., Wanunu M; Physics Department, Northeastern University, Boston, MA 02115, USA., Noy A; Biology and Biotechnology Division, Physical and Life Sciences Directorate, Lawrence Livermore National Laboratory, Livermore, CA 94550, USA. noy1@llnl.gov.; School of Natural Sciences, University of California Merced, Merced, CA 94343, USA.
Jazyk: angličtina
Zdroj: Science (New York, N.Y.) [Science] 2017 Aug 25; Vol. 357 (6353), pp. 792-796.
DOI: 10.1126/science.aan2438
Abstrakt: 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.
(Copyright © 2017 The Authors, some rights reserved; exclusive licensee American Association for the Advancement of Science. No claim to original U.S. Government Works.)
Databáze: MEDLINE
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