Nano Archive

Why are carbon nanotubes fast transporters of water?

Joseph, Sony and Aluru, N. R. (2008) Why are carbon nanotubes fast transporters of water? NANO LETTERS, 8 (2). pp. 452-458. ISSN 1530-6984

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Extraordinarily fast transport of water in carbon nanotubes (CNTs) in recent experiments has been generally attributed to the smoothness of the CNT surface. Using molecular dynamics simulations we investigate water flow in (16,16) CNTs and show that the enhanced flow rates over Hagen-Poiseuille flow arise from a velocity ``jump'' in a depletion region at the water nanotube interface and that the water orientations and hydrogen bonding at the interface significantly affect the flow rates. For nanotube with the same smooth wall structure but with more hydrophilic Lennard-Jones (LJ) parameters of silicon, the enhancement is greatly reduced because it does not have ``free'' OH bonds pointing to the wall as in CNTs that would reduce the number of hydrogen bonds in the depletion layer. Roughness in the tube walls causes strong hydrogen-bonding network and no significant flow enhancement is attained in rough tubes.

Item Type:Article
Subjects:Physical Science > Nanophysics
Material Science > Nanostructured materials
ID Code:236
Deposited By:Lesley Tobin
Deposited On:18 Dec 2008 13:40
Last Modified:18 Dec 2008 13:46

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