气候变化领域集成服务门户(CCPortal): ESR evidence for 2 coexisting liquid phases in deeply supercooled bulk water

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DOI	10.1073/pnas.0900734106
	ESR evidence for 2 coexisting liquid phases in deeply supercooled bulk water
	Banerjee D.; Bhat S.N.; Bhat S.V.; Leporini D.
发表日期	2009
ISSN	0027-8424
起始页码	11448
结束页码	11453
卷号	106 期号:28
英文摘要	Using electron spin resonance spectroscopy (ESR), we measure the rotational mobility of probe molecules highly diluted in deeply supercooled bulk water and negligibly constrained by the possible ice fraction. The mobility increases above the putative glass transition temperature of water, T g = 136 K, and smoothly connects to the thermodynamically stable region by traversing the so called "no man's land" (the range 150-235 K), where it is believed that the homogeneous nucleation of ice suppresses the liquid water. Two coexisting fractions of the probe molecules are evidenced. The 2 fractions exhibit different mobility and fragility; the slower one is thermally activated (low fragility) and is larger at low temperatures below a fragile-to-strong dynamic cross-over at ≈225 K. The reorientation of the probe molecules decouples from the viscosity below ≈225 K. The translational diffusion of water exhibits a corresponding decoupling at the same temperature [Chen S-H, et al. (2006) The violation of the Stokes-Einstein relation in supercooled water. Proc Natl Acad Sci USA 103:12974-12978]. The present findings are consistent with key issues concerning both the statics and the dynamics of supercooled water, namely the large structural fluctuations [Poole PH, Sciortino F, Essmann U, Stanley HE (1992) Phase behavior of metastable water. Nature 360:324-328] and the fragile-to-strong dynamic cross-over at ≈228 K [Ito K, Moynihan CT, Angell CA (1999) Thermodynamic determination of fragility in liquids and a fragile-tostrong liquid transition in water.
英文关键词	Decoupling of transport properties; Dynamic cross-over in water; Dynamic heterogeneity; Polycrystalline materials; Supercooled water
语种	英语
scopus关键词	crystallin; water; article; diffusion coefficient; dilution; electron spin resonance; low temperature; priority journal; thermodynamics; viscosity; water temperature; Electron Spin Resonance Spectroscopy; Molecular Probes; Phase Transition; Temperature; Thermodynamics; Viscosity; Water
来源期刊	Proceedings of the National Academy of Sciences of the United States of America
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/159163
作者单位	Banerjee, D., Department of Physics, Indian Institute of Science, Bangalore 560 012, India; Bhat, S.N., Department of Physics, Indian Institute of Science, Bangalore 560 012, India; Bhat, S.V., Department of Physics, Indian Institute of Science, Bangalore 560 012, India; Leporini, D., Dipartimento di Fisica Enrico Fermi, Università di Pisa, Largo B. Pontecorvo 3, I-56127 Pisa, Italy, SOFT-National Institute for the Physics of Matter-Consiglio Nazionale Delle Ricerche, Largo B. Pontecorvo 3, I-56127 Pisa, Italy
推荐引用方式 GB/T 7714	Banerjee D.,Bhat S.N.,Bhat S.V.,et al. ESR evidence for 2 coexisting liquid phases in deeply supercooled bulk water[J],2009,106(28).
APA	Banerjee D.,Bhat S.N.,Bhat S.V.,&Leporini D..(2009).ESR evidence for 2 coexisting liquid phases in deeply supercooled bulk water.Proceedings of the National Academy of Sciences of the United States of America,106(28).
MLA	Banerjee D.,et al."ESR evidence for 2 coexisting liquid phases in deeply supercooled bulk water".Proceedings of the National Academy of Sciences of the United States of America 106.28(2009).