Anomalously soft dynamics of water in a nanotube: a revelation of nanoscale confinement |
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Authors: | Kolesnikov Alexander I Zanotti Jean-Marc Loong Chun-Keung Thiyagarajan Pappannan Moravsky Alexander P Loutfy Raouf O Burnham Christian J |
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Institution: | Intense Pulsed Neutron Source Division, Argonne National Laboratory, Argonne, Illinois 60439, USA. |
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Abstract: | Quasi-one-dimensional water encapsulated inside single-walled carbon nanotubes, here referred to as nanotube water, was studied by neutron scattering. The results reveal an anomalously soft dynamics characterized by pliable hydrogen bonds, anharmonic intermolecular potentials, and large-amplitude motions in nanotube water. Molecular dynamics simulations consistently describe the observed phenomena and propose the structure of nanotube water, which comprises a square-ice sheet wrapped into a cylinder inside the carbon nanotube and interior molecules in a chainlike configuration. |
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