The Boson peak in confined water: An experimental investigation of the liquid-liquid phase transition hypothesis
Francesco Mallamace , Carmelo Corsaro , Domenico Mallamace , Zhe Wang , Sow-Hsin Chen
Front. Phys. ›› 2015, Vol. 10 ›› Issue (5) : 106103
The Boson peak in confined water: An experimental investigation of the liquid-liquid phase transition hypothesis
The Boson peak (BP) of deeply cooled confined water is studied by using inelastic neutron scattering (INS) in a large interval of the (P, T) phase plane. By taking into account the different behavior of such a collective vibrational mode in both strong and fragile glasses as well as in glass-forming materials, we were able to determine the Widom line that characterizes supercooled bulk water within the frame of the liquid-liquid phase transition (LLPT) hypothesis. The peak frequency and width of the BP correlated with the water polymorphism of the LLPT scenario, allowing us to distinguish the “low-density liquid” (LDL) and “high-density liquid” (HDL) phases in deeply cooled bulk water.Moreover, the BP properties afford a further confirmation of theWidom line temperature TW as the (P, T) locus in which the local structure of water transforms from a predominately LDL form to a predominately HDL form.
supercooled water / liquid-liquid phase transition (LLPT) / inelastic neutron scattering
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Higher Education Press and Springer-Verlag Berlin Heidelberg
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