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Strong correlations and Fickian water diffusion in narrow carbon nanotubes

Mukherjee, Biswaroop and Maiti, Prabal K. and Dasgupta, Chandan and Sood, A. K (2007) Strong correlations and Fickian water diffusion in narrow carbon nanotubes. The Journal of Chemical Physics, 126 (12). pp. 124704-1.

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Official URL: http://link.aip.org/link/?JCPSA6/126/124704/1

Abstract

The authors have used atomistic molecular dynamics (MD) simulations to study the structure and dynamics of water molecules inside an open ended carbon nanotube placed in a bath of water molecules. The size of the nanotube allows only a single file of water molecules inside the nanotube. The water molecules inside the nanotube show solidlike ordering at room temperature, which they quantify by calculating the pair correlation function. It is shown that even for the longest observation times, the mode of diffusion of the water molecules inside the nanotube is Fickian and not subdiffusive. They also propose a one-dimensional random walk model for the diffusion of the water molecules inside the nanotube. They find good agreement between the mean-square displacements calculated from the random walk model and from MD simulations, thereby confirming that the water molecules undergo normal mode diffusion inside the nanotube. They attribute this behavior to strong positional correlations that cause all the water molecules inside the nanotube to move collectively as a single object. The average residence time of the water molecules inside the nanotube is shown to scale quadratically with the nanotube length.

Item Type:Article
Subjects:Physical Science > Nanophysics
Divisions:Faculty of Engineering, Science and Mathematics > School of Physics
ID Code:3743
Deposited By:JNCASR
Deposited On:27 Jan 2009 09:58
Last Modified:27 Jan 2009 09:58

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