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

作　　者：Francesco Mallamace Carmelo Corsaro Domenico Mallamace Zhe Wang Sow-Hsin Chen 

机构地区：[1]Department of Nuclear Science and Engineering, Massachusetts Institute of Technology, Cambridge, MA 02139, USA [2]Dipartimento di Fisica e Scienze della Terra, Universita di Messina, I-98166, Messina, Italy [3]Consiglio Nazionale delle Ricerche-IPCF Messina, I-98166, Messina, Italy [4]Dipartimento di Scienze dell'Ambiente, della Sicurezza, del Territorio, degli Alimentie, e della Salute, Universit5 di Messina Viale F. Stagno d'Alcontres 31, 98166 Messina, Italy

出　　处：《Frontiers of physics》2015年第5期43-49,共7页物理学前沿（英文版）

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 Tw as the （P, T） locus in which the local structure of water transforms from a predominately LDL form to a predominately HDL form.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 Tw as the （P, T） locus in which the local structure of water transforms from a predominately LDL form to a predominately HDL form.

关 键 词：supercooled water liquid-liquid phase transition （LLPT） inelastic neutron scattering 

分 类 号：TQ085.4[化学工程] TQ028.31