Report

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

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Science  25 Aug 2017:
Vol. 357, Issue 6353, pp. 792-796
DOI: 10.1126/science.aan2438

Go with the flow

Enhanced water transport occurs in a number of narrow pore channels, such as biological aquaporins. Tunuguntla et al. thoroughly characterized molecular transport through narrow carbon nanotubes (CNTs) (see the Perspective by Siwy and Fornasiero). In contrast to previous studies, the authors focused on water and ion transport through relatively short (∼10-nm) fragments of CNTs embedded in lipid bilayer membranes. Strong confinement generated highly accelerated water flow compared with that observed in biological water transporters. A key factor in the transport rate was the tunable rearrangement of intermolecular hydrogen bonding. Furthermore, by changing the charges at the mouth of the nanotube, the authors were able to alter the ion selectivity.

Science, this issue p. 792; see also p. 753