Water at nanoscale confined in single-walled carbon nanotubes studied by NMR

Ghosh, S. ; Ramanathan, K. V. ; Sood, A. K. (2004) Water at nanoscale confined in single-walled carbon nanotubes studied by NMR EPL: Europhysics Letters, 65 (5). pp. 678-684. ISSN 0295-5075

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Official URL: http://iopscience.iop.org/0295-5075/65/5/678?fromS...

Related URL: http://dx.doi.org/10.1209/epl/i2003-10160-9


Proton NMR studies have been carried out as a function of temperature from 210 K to 300 K on water confined within single-walled carbon nanotubes. The NMR lineshape at and below the freezing point of bulk water is asymmetric and can be decomposed into a sum of two Lorentzians. The intensities of both the components decrease with the lowering of the temperature below 273 K, one component, L1, vanishing below 242 K and the other component, L2, below 217 K. Following the simulations of Koga et al. showing that the radial density profile of confined water in single-wall carbon nanotubes has a distribution peak at the center which disappears below the freezing temperature, the L1-component is associated with the protons of the water molecules at the center and the L2-component is associated with protons of water molecules at a distance of ~ 3 Å from the walls of the nanotubes. In this scenario the complete freezing of the water at ~ 212 K is preceded by the withdrawal of the water molecules from the center.

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