Anomalously soft dynamics of water in a nanotube: a revelation of nanoscale confinement.
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.
Kolesnikov
Alexander I
AI
Intense Pulsed Neutron Source Division, Argonne National Laboratory, Argonne, Illinois 60439, USA.
Zanotti
Jean-Marc
JM
Loong
Chun-Keung
CK
Thiyagarajan
Pappannan
P
Moravsky
Alexander P
AP
Loutfy
Raouf O
RO
Burnham
Christian J
CJ
D003198:Computer Simulation; D008956:Models, Chemical; D037742:Nanotubes, Carbon / Q000737:chemistry*; D009502:Neutrons; D012542:Scattering, Radiation; D014867:Water / Q000737:chemistry*
D037742:Nanotubes, Carbon; D014867:Water