The Boson peak in confined water: An experimental investigation of the liquid-liquid phase transition hypothesis |
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| Authors: | Francesco Mallamace Carmelo Corsaro Domenico Mallamace Zhe Wang Sow-Hsin Chen |
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| Institution: | 1. Department of Nuclear Science and Engineering, Massachusetts Institute of Technology, Cambridge, MA 02139, USA2. Dipartimento di Fisica e Scienze della Terra, Universit`a di Messina, I-98166, Messina, Italy3. Consiglio Nazionale delle Ricerche-IPCF Messina, I-98166, Messina, Italy4. Dipartimento di Scienze dell’Ambiente, della Sicurezza, del Territorio, degli Alimentie, e della Salute, Università di Messina Viale F. Stagno d’Alcontres 31, 98166 Messina, Italy |
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| Abstract: | 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. |
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| Keywords: | supercooled water liquid-liquid phase transition (LLPT) inelastic neutron scattering |
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