期刊
JOURNAL OF PHYSICAL CHEMISTRY B
卷 114, 期 5, 页码 1870-1878出版社
AMER CHEMICAL SOC
DOI: 10.1021/jp910038j
关键词
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资金
- DOE [DE-FG02-90ER45429, 2113-MIT-DOE-591]
- National Science Foundation [DMR-0086210]
Using nuclear magnetic resonance and quasi-elastic neutron scattering spectroscopic techniques, we obtain experimental evidence of a well-defined dynamic crossover temperature T-L in supercooled water. We consider three different geometrical environments: (i) water confined in a nanotube (quasi-one-dimensional water), (ii) water in the first hydration layer of the lysozyme protein (quasi-two-dimensional water), and (iii) water in a mixture with methanol at a methanol molar fraction of x = 0.22 (quasi-three-dimensional water). The temperature predicted using a power law approach to analyze the bulk water viscosity in the super-Arrhenius regime defines the fragile-to-strong transition and the Stokes-Einstein relation breakdown recently observed in confined water. Our experiments show that these observed processes are independent of the system dimension d and are instead caused by the onset of an extended hydrogen-bond network that governs the dynamical properties of water as it approaches dynamic arrest.
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