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Anomalously soft dynamics of water in carbon nanotubes

✍ Scribed by A.I. Kolesnikov; C.-K. Loong; N.R. de Souza; C.J. Burnham; A.P. Moravsky

Publisher
Elsevier Science
Year
2006
Tongue
English
Weight
330 KB
Volume
385-386
Category
Article
ISSN
0921-4526

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✦ Synopsis

The structure and dynamics of water confined to the one-dimensional nanotube interior are found to be drastically altered with respect to bulk water. Neutron diffraction, inelastic and quasielastic neutron scattering measurements in parallel with MD simulations have clearly shown the entry of water into open-ended single-wall carbon nanotubes and identified an ice-shell plus central water-chain structure. The observed extremely soft dynamics of nanotube-water arises mainly from a qualitatively large reduction in the hydrogenbond connectivity of the water chain. Anomalously enhanced thermal motions in the water chain, modeled by a low-barrier, flattened, highly anharmonic potential well, explain the large mean-square displacement of hydrogen and the fluid-like behavior of nanotube-water at temperatures far below the nominal freezing point.

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