Fragile-to-strong liquid transition in deeply supercooled confined water
Antonio Faraone(University of Messina), L. Liu(Massachusetts Institute of Technology), Chung‐Yuan Mou(National Taiwan University), Chun‐Wan Yen(National Taiwan University), S.-H. Chen(Massachusetts Institute of Technology)
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Abstract
Confining water in lab synthesized nanoporous silica matrices MCM-41-S with pore diameters of 18 and 14 A, 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 approximately equal to 225 K, which we interpreted as the predicted fragile-to-strong liquid-liquid transition.
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