Nano Archive

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

Ghosh, S. and Ramanathan, K. V. and Sood, A. K. (2004) Water at nanoscale confined in single-walled carbon nanotubes studied by NMR. Euro phys. Lett, 65 (5). 678-684 .

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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.

Item Type:Article
Subjects:Physical Science > Nanophysics
Material Science > Functional and hybrid materials
Material Science > Nanofabrication processes and tools
Analytical Science > Nanotechnology for sensing and actuating
Physical Science > Nano objects
Material Science > Nanostructured materials
Physical Science > Photonics
Divisions:Faculty of Engineering, Science and Mathematics > School of Physics
Faculty of Engineering, Science and Mathematics > School of Chemistry
ID Code:4365
Deposited By:JNCASR
Deposited On:03 Apr 2009 05:13
Last Modified:03 Apr 2009 05:13

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