Barriers to superfast water transport in carbon nanotube membranes

Jens H. Walther, Konstantinos Ritos, Eduardo R. Cruz-Chu, Constantine M. Megaridis, Petros Koumoutsakos

Research output: Contribution to journalArticle

160 Citations (Scopus)

Abstract

Carbon nanotube (CNT) membranes hold the promise of extraordinary fast water transport for applications such as energy efficient filtration and molecular level drug delivery. However, experiments and computations have reported flow rate enhancements over continuum hydro-dynamics that contradict each other by orders of magnitude. We perform large scale molecular dynamics simulations emulating for the first time the micrometer thick CNTs membranes used in experiments. We find transport enhancement rates that are length dependent due to entrance and exit losses but asymptote to 2 orders of magnitude over the continuum predictions. These rates are far below those reported experimentally. The results suggest that the reported superfast water transport rates cannot be attributed to interactions of water with pristine CNTs alone.
Original languageEnglish
Pages (from-to)1910-1914
Number of pages5
JournalNano Letters
Volume13
Issue number5
DOIs
Publication statusPublished - 12 Mar 2013

Keywords

  • carbon nanotrubes
  • molecular dynamics
  • super fast water transport

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