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Single-File Diffusion of Confined Water Inside SWNTs: An NMR Study

Das, A and Jayanthi, S and Deepak, HSMV and Ramanathan, KV and Kumar, A and Dasgupta, C and Sood, AK (2010) Single-File Diffusion of Confined Water Inside SWNTs: An NMR Study. In: ACS Nano, 4 (3). pp. 1687-1695.

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Official URL: http://pubs.acs.org/doi/abs/10.1021/nn901554h


We report a nuclear magnetic resonance (NMR) study of confined water inside similar to 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: Journal Article
Publication: ACS Nano
Publisher: American Chemical Society
Additional Information: Copyright of this article belongs to American Chemical Society.
Department/Centre: Division of Chemical Sciences > NMR Research Centre (Formerly Sophisticated Instruments Facility)
Division of Physical & Mathematical Sciences > Physics
Date Deposited: 13 Jul 2010 07:09
Last Modified: 19 Sep 2010 06:10
URI: http://eprints.iisc.ac.in/id/eprint/29116

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