Nature Nanotechnology 10, 459–464 (2015); published online 23 March 2015; corrected after print 14 October 2016.

In the version of this Article originally published, the water flux calculated from simulations in ref. 28 was incorrectly stated as 1.7 × 10−12 g s−1 bar−1 per pore; the correct value is 1.7 × 10−15 g s−1 bar−1 per pore. Sentences in the main text related to this value and the comparison to experimental results have been amended. This does not change the experimental results or conclusions. This error has been corrected in the online versions of the Article.