Fast Water Transport in CNTs: length dependence and entrane/exit effects

Jens Honore Walther, Petros Koumoutsakos

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Abstract

Superfast water transport in carbon nanotube (CNT) membranes has been reported in experimental studies. We use Molecular Dynamics simulations to elucidate the mechanisms of water entry, exit and transport in 2nm-diameter hydrophobic CNTs embedded in a hydrophilic membrane matrix. We demonstrate, for the first time, that under imposed pressures of the order of 1 bar, water entry into the CNT cavity and exit from the CNT end, can occur only on pre-wetted membranes. We conduct large scale simulations for up to 500nm long CNTs and observe a previously unseen dependence of the flow enhancement rates on the CNT length. We relate the present findings to past computational and experimental studies, we discuss previous continuum assessments for this flow and propose underlying physical mechanisms.
Original languageEnglish
Publication date2011
Publication statusPublished - 2011
Event64th Annual Meeting of the American Physical Society's Division of Fluid Dynamics - Baltimore, MD, United States
Duration: 20 Nov 201122 Nov 2011

Conference

Conference64th Annual Meeting of the American Physical Society's Division of Fluid Dynamics
CountryUnited States
CityBaltimore, MD
Period20/11/201122/11/2011

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Walther, J. H., & Koumoutsakos, P. (2011). Fast Water Transport in CNTs: length dependence and entrane/exit effects. Abstract from 64th Annual Meeting of the American Physical Society's Division of Fluid Dynamics , Baltimore, MD, United States.