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Slow Dynamics of Premelting Water Molecules Confined in a Hydrophilic Nanoporous Space
Author(s) -
Ohata Yuki,
Kamebuchi Hajime,
Watanabe Keisuke,
Kouchi Takaya,
Suzuki You,
Imaizumi Taku,
Sugaya Tomoaki,
Mizuno Motohiro,
Tadokoro Makoto
Publication year - 2019
Publication title -
chemistryselect
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.437
H-Index - 34
ISSN - 2365-6549
DOI - 10.1002/slct.201901733
Subject(s) - premelting , nanoporous , molecule , crystal (programming language) , chemical physics , materials science , crystallography , crystal structure , annealing (glass) , confined space , molecular dynamics , chemistry , nanotechnology , computational chemistry , composite material , organic chemistry , melting point , computer science , programming language
The mobility, thermal behaviour, and crystal structures of water molecules confined within a one‐dimensional (1‐D), nanoporous single crystal in the premelting state were investigated in this study. Water clusters confined within the hydrophilic crystal revealed a premelting phase that was intermediate between the frozen and melted states. Water molecules in the premelting phase moved slowly. Heat capacity measurements showed that this motion could continue for approximately 24 hours after annealing at 160 K, although this could not be confirmed with solid‐state 2 H‐NMR analysis. X‐ray diffraction analysis established the coexistence of crystal structures in the frozen and premelting states at 165 K. These results represent a valuable contribution to understanding the dynamic properties of water confined within nanoscale spaces.