メタンのガスハイドレートの構造も様々であるが、水分子は中々可塑性の大きいものであるらしい。
鉱物のberyl Be3Al2(Si O3)6に似た水の構造とは興味深いが、ガス、液体、固体を超える状態なのか？宇宙の太古の昔から存在すると考えられるプロトン、電子、そして水は実は量子力学的な存在なのか。少なくても粒ではない！
dalamatiacity.com/urantia-clues39
New state of water molecule discovered
Date: April 22, 2016 sciencedaily.com
Source: DOE/Oak Ridge National Laboratory
Summary: Neutron scattering and computational modeling have revealed unique and unexpected behavior of water molecules under extreme confinement that is unmatched by any known gas, liquid or solid states.
Neutron scattering and computational modeling have revealed unique and unexpected behavior of water molecules under extreme confinement that is unmatched by any known gas, liquid or solid states.
In a paper published in Physical Review Letters, researchers at the Department of Energy's Oak Ridge National Laboratory describe a new tunneling state of water molecules confined in hexagonal ultra-small channels -- 5 angstrom across -- of the mineral beryl. An angstrom is 1/10-billionth of a meter, and individual atoms are typically about 1 angstrom in diameter.
"At low temperatures, this tunneling water exhibits quantum motion through the separating potential walls, which is forbidden in the classical world,"
said lead author Alexander Kolesnikov of ORNL's Chemical and Engineering Materials Division.
"This means that the oxygen and hydrogen atoms of the water molecule are 'delocalized' and therefore simultaneously present in all six symmetrically equivalent positions in the channel at the same time. It's one of those phenomena that only occur in quantum mechanics and has no parallel in our everyday experience."
The existence of the tunneling state of water shown in ORNL's study should help scientists better describe the thermodynamic properties and behavior of water in highly confined environments such as water diffusion and transport in the channels of cell membranes, in carbon nanotubes and along grain boundaries and at mineral interfaces in a host of geological environments.
ORNL co-author Lawrence Anovitz noted that the discovery is apt to spark discussions among materials, biological, geological and computational scientists as they attempt to explain the mechanism behind this phenomenon and understand how it applies to their materials.
"This discovery represents a new fundamental understanding of the behavior of water and the way water utilizes energy,"
Anovitz said.
"It's also interesting to think that those water molecules in your aquamarine or emerald ring -- blue and green varieties of beryl-- are undergoing the same quantum tunneling we've seen in our experiments."
While previous studies have observed tunneling of atomic hydrogen in other systems, the ORNL discovery that water exhibits such tunneling behavior is unprecedented.
The neutron scattering and computational chemistry experiments showed that, in the tunneling state, the water molecules are delocalized around a ring so the water molecule assumes an unusual double top-like shape.
"The average kinetic energy of the water protons directly obtained from the neutron experiment is a measure of their motion at almost absolute zero temperature and is about 30 percent less than it is in bulk liquid or solid water,"
Kolesnikov said.
"This is in complete disagreement with accepted models based on the energies of its vibrational modes."
First principle simulations made by Narayani Choudhury of Lake Washington Institute of Technology and University of Washington-Bothell showed that the tunneling behavior is coupled to the vibrational dynamics of the beryl structure.