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

Journal Article · · Frontiers of Physics
 [1];  [2];  [3];  [4];  [4]
  1. Massachusetts Inst. of Technology (MIT), Cambridge, MA (United States). Dept. of Nuclear Science and Engineering; Univ. of Messina (Italy). Dept. of Physics and Earth Sciences; National Research Council (CNR) Inst. for Chemical-Physical Processes (IPCF), Messina (Italy); MIT
  2. Univ. of Messina (Italy). Dept. of Physics and Earth Sciences; National Research Council (CNR) Inst. for Chemical-Physical Processes (IPCF), Messina (Italy)
  3. Dept. of Environmental, Security, Territory, Food, and Health Sciences, Messina (Italy)
  4. Massachusetts Inst. of Technology (MIT), Cambridge, MA (United States). Dept. of Nuclear Science and Engineering
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 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.
Research Organization:
Massachusetts Inst. of Technology (MIT), Cambridge, MA (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22)
Grant/Contract Number:
FG02-90ER45429
OSTI ID:
1437127
Journal Information:
Frontiers of Physics, Journal Name: Frontiers of Physics Journal Issue: 5 Vol. 10; ISSN 2095-0462
Publisher:
SpringerCopyright Statement
Country of Publication:
United States
Language:
English

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Figures / Tables (5)