Single-file diffusion of confined water inside SWNTs: an NMR study

Das, Anindya ; Jayanthi, Sundaresan ; Deepak, Handiganadu. Srinivasa. Murthy Vinay ; Ramanathan, Krishna Venkatachala ; Anil Kumar, ; Dasgupta, Chandan ; Sood, Ajay K. (2010) Single-file diffusion of confined water inside SWNTs: an NMR study ACS Nano, 4 (3). pp. 1687-1695. ISSN 1936-0851

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We report a nuclear magnetic resonance (NMR) study of confined water inside ~1.4 nm diameter single-walled carbon nanotubes (SWNTs). We show that the confined water does not freeze even up to 223 K. A pulse field gradient (PFG) NMR method is used to determine the mean squared displacement (MSD) of the water molecules inside the nanotubes at temperatures below 273 K, where the bulk water outside the nanotubes freezes and hence does not contribute to the proton NMR signal. We show that the mean squared displacement varies as the square root of time, predicted for single-file diffusion in a one-dimensional channel. We propose a qualitative understanding of our results based on available molecular dynamics simulations.

Item Type:Article
Source:Copyright of this article belongs to American Chemical Society.
Keywords:Carbon Nanotubes; Water; Confinement; Single-file Diffusion; NMR
ID Code:22891
Deposited On:25 Nov 2010 13:53
Last Modified:24 Sep 2011 08:45

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