Fragile-to-strong liquid transition in deeply supercooled confined water

A. Faraone; L. Liu; C. Y. Mou; C. W. Yen; S. H. Chen

doi:10.1063/1.1832595

Fragile-to-strong liquid transition in deeply supercooled confined water

A. Faraone, L. Liu, C. Y. Mou, C. W. Yen, S. H. Chen

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302 Citations (Scopus)

Abstract

Confining water in lab synthesized nanoporous silica matrices MCM-41-S with pore diameters of 18 and 14 Å, we have been able to study the molecular dynamics of water in deeply supercooled states, down to 200 K. Using quasielastic neutron scattering and analyzing the data with the relaxing cage model, we determined the temperature variation of the average translational relaxation time and its Q-dependence. We find a clear evidence of an abrupt change of the relaxation time behavior at T ≈ 225 K, which we interpreted as the predicted fragile-to-strong liquid-liquid transition.

Original language	English
Article number	4
Pages (from-to)	10843-10846
Number of pages	4
Journal	Journal of Chemical Physics
Volume	121
Issue number	22
DOIs	https://doi.org/10.1063/1.1832595
Publication status	Published - Dec 8 2004
Externally published	Yes

ASJC Scopus subject areas

General Physics and Astronomy
Physical and Theoretical Chemistry

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10.1063/1.1832595

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abstract = "Confining water in lab synthesized nanoporous silica matrices MCM-41-S with pore diameters of 18 and 14 {\AA}, we have been able to study the molecular dynamics of water in deeply supercooled states, down to 200 K. Using quasielastic neutron scattering and analyzing the data with the relaxing cage model, we determined the temperature variation of the average translational relaxation time and its Q-dependence. We find a clear evidence of an abrupt change of the relaxation time behavior at T ≈ 225 K, which we interpreted as the predicted fragile-to-strong liquid-liquid transition.",

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AU - Faraone, A.

AU - Liu, L.

AU - Mou, C. Y.

AU - Yen, C. W.

AU - Chen, S. H.

PY - 2004/12/8

Y1 - 2004/12/8

N2 - Confining water in lab synthesized nanoporous silica matrices MCM-41-S with pore diameters of 18 and 14 Å, we have been able to study the molecular dynamics of water in deeply supercooled states, down to 200 K. Using quasielastic neutron scattering and analyzing the data with the relaxing cage model, we determined the temperature variation of the average translational relaxation time and its Q-dependence. We find a clear evidence of an abrupt change of the relaxation time behavior at T ≈ 225 K, which we interpreted as the predicted fragile-to-strong liquid-liquid transition.

AB - Confining water in lab synthesized nanoporous silica matrices MCM-41-S with pore diameters of 18 and 14 Å, we have been able to study the molecular dynamics of water in deeply supercooled states, down to 200 K. Using quasielastic neutron scattering and analyzing the data with the relaxing cage model, we determined the temperature variation of the average translational relaxation time and its Q-dependence. We find a clear evidence of an abrupt change of the relaxation time behavior at T ≈ 225 K, which we interpreted as the predicted fragile-to-strong liquid-liquid transition.

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IS - 22

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ER -

Fragile-to-strong liquid transition in deeply supercooled confined water

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