Electrically controlled water permeation through graphene oxide membranes

K.-G. Zhou (), K. S. Vasu (), C. T. Cherian, M. Neek-Amal, J. C. Zhang, H. Ghorbanfekr-Kalashami, K. Huang, O. P. Marshall, V. G. Kravets, J. Abraham, Y. Su, A. N. Grigorenko, A. Pratt, A. K. Geim, F. M. Peeters, K. S. Novoselov and R. R. Nair ()
Additional contact information
K.-G. Zhou: National Graphene Institute, University of Manchester
K. S. Vasu: National Graphene Institute, University of Manchester
C. T. Cherian: National Graphene Institute, University of Manchester
M. Neek-Amal: Shahid Rajaee Teacher Training University
J. C. Zhang: University of York
H. Ghorbanfekr-Kalashami: University of Antwerp
K. Huang: National Graphene Institute, University of Manchester
O. P. Marshall: School of Physics and Astronomy, University of Manchester
V. G. Kravets: School of Physics and Astronomy, University of Manchester
J. Abraham: National Graphene Institute, University of Manchester
Y. Su: National Graphene Institute, University of Manchester
A. N. Grigorenko: School of Physics and Astronomy, University of Manchester
A. Pratt: University of York
A. K. Geim: School of Physics and Astronomy, University of Manchester
F. M. Peeters: University of Antwerp
K. S. Novoselov: School of Physics and Astronomy, University of Manchester
R. R. Nair: National Graphene Institute, University of Manchester

Nature, 2018, vol. 559, issue 7713, 236-240

Abstract: Abstract Controlled transport of water molecules through membranes and capillaries is important in areas as diverse as water purification and healthcare technologies1–7. Previous attempts to control water permeation through membranes (mainly polymeric ones) have concentrated on modulating the structure of the membrane and the physicochemical properties of its surface by varying the pH, temperature or ionic strength3,8. Electrical control over water transport is an attractive alternative; however, theory and simulations9–14 have often yielded conflicting results, from freezing of water molecules to melting of ice14–16 under an applied electric field. Here we report electrically controlled water permeation through micrometre-thick graphene oxide membranes17–21. Such membranes have previously been shown to exhibit ultrafast permeation of water17,22 and molecular sieving properties18,21, with the potential for industrial-scale production. To achieve electrical control over water permeation, we create conductive filaments in the graphene oxide membranes via controllable electrical breakdown. The electric field that concentrates around these current-carrying filaments ionizes water molecules inside graphene capillaries within the graphene oxide membranes, which impedes water transport. We thus demonstrate precise control of water permeation, from ultrafast permeation to complete blocking. Our work opens up an avenue for developing smart membrane technologies for artificial biological systems, tissue engineering and filtration.

Date: 2018
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DOI: 10.1038/s41586-018-0292-y

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