Anomalously soft dynamics of water in carbon nanotubes
| Autor: | N. R. de Souza, Christian J. Burnham, Chun-Keung Loong, Alexander P. Moravsky, Alexander I. Kolesnikov |
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| Rok vydání: | 2006 |
| Předmět: |
Materials science
Hydrogen Neutron diffraction chemistry.chemical_element Carbon nanotube Inelastic scattering Neutron scattering Condensed Matter Physics Electronic Optical and Magnetic Materials Freezing point law.invention Mean squared displacement chemistry law Chemical physics Quasielastic neutron scattering Electrical and Electronic Engineering Atomic physics Physics::Atmospheric and Oceanic Physics |
| Zdroj: | Physica B: Condensed Matter. :272-274 |
| ISSN: | 0921-4526 |
| Popis: | 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 hydrogen-bond 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. |
| Databáze: | OpenAIRE |
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