Dynamic Crossovers and Stepwise Solidification of Confined Water: A 2H NMR Study

被引:68
|
作者
Sattig, M. [1 ]
Vogel, M. [1 ]
机构
[1] Tech Univ Darmstadt, Inst Festkorperphys, D-64289 Darmstadt, Germany
来源
关键词
TO-STRONG TRANSITION; GLASS-TRANSITION; RELAXATION; DEPENDENCE; MOLECULES; BEHAVIOR; LIQUIDS; MCM-41;
D O I
10.1021/jz402539r
中图分类号
O64 [物理化学(理论化学)、化学物理学];
学科分类号
070304 ; 081704 ;
摘要
H-2 NMR reveals two dynamic crossovers of supercooled water in nanoscopic (similar to 2 nm) confinement. At similar to 225 K, a dynamic crossover of liquid water is accompanied by formation of a fraction of solid water. Therefore, we do not attribute the effect to a liquid-liquid phase transition but rather to a change from bulk-like to interface-dominated dynamics. Moreover, we argue that the alpha process and beta process are observed in experiments above and below this temperature, respectively. Upon cooling through a dynamic crossover at similar to 175 K, the dynamics of the liquid fraction becomes anisotropic and localized, implying solidification of the corresponding water network, most probably, during a confinement-affected glass transition.
引用
收藏
页码:174 / 178
页数:5
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