Two-dimensional water and ice layers: neutron diffraction studies at 278, 263, and 20 k |
| |
Authors: | Janiak Christoph Scharmann Tobias G Mason Sax A |
| |
Institution: | Institut für Anorganische und Analytische Chemie, Universit?t Freiburg, Albertstrasse 21, D-79104 Freiburg, Germany. janiak@uni-freiburg.de |
| |
Abstract: | Neutron diffraction elucidates the structures of two-dimensional (2D) water layers (278 K) or 2D ice layers confined in an organic slit-shaped nanospace. The two-dimensional ice phases reported here consist of individual eight-membered rings or folded-chain segments (263 K) and condensed twelve-membered irregular rings (20 K). This is quite different from bulk or other 2D ice structures; the latter usually form hexagonal honeycomb lattices. Both low-temperature structures typically feature water molecules which are surrounded by two or three other water molecules. Neutron diffraction and thermochemical studies indicate a liquid-solid-phase transition around 277 K for two-dimensional D2O layers. A further solid-solid-phase transition occurs between 263 and 20 K. |
| |
Keywords: | |
本文献已被 PubMed 等数据库收录! |
|