The Boson peak in confined water: An experimental investigation of the liquid-liquid phase transition hypothesis

被引：8
作者：
Mallamace, Francesco [1 ,2 ,3 ]
Corsaro, Carmelo [2 ,3 ]
Mallamace, Domenico [4 ]
Wang, Zhe [1 ]
Chen, Sow-Hsin [1 ]
机构：
[1] MIT, Dept Nucl Sci & Engn, Cambridge, MA 02139 USA
[2] Univ Messina, Dipartimento Fis & Sci Terra, I-98166 Messina, Italy
[3] Consiglio Nazl Ric IPCF Messina, I-98166 Messina, Italy
[4] Univ Messina, Dipartimento Sci Ambiente Sicurezza Terr Alimenti, I-98166 Messina, Italy
来源：
FRONTIERS OF PHYSICS | 2015年 / 10卷 / 05期
关键词：
supercooled water; liquid-liquid phase transition (LLPT); inelastic neutron scattering; DYNAMIC CROSSOVER TEMPERATURE; STOKES-EINSTEIN RELATION; GLASS-TRANSITION; SUPERCOOLED LIQUIDS; ANOMALOUS BEHAVIOR; NEUTRON; SCATTERING; PHONONS; ORIGIN; RAMAN;
D O I：
10.1007/s11467-015-0487-8
中图分类号：
O4 [物理学];
学科分类号：
0702 ;
摘要：
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 the Widom line temperature T-W 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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页数：7
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