The boson peak of deeply cooled confined water reveals the existence of a low-temperature liquid-liquid crossover

The Boson peak of deeply cooled water confined in the pores of a silica xerogel is studied by inelastic neutron scattering at different hydration levels to separate the contributions from matrix, water on the pore surfaces and "internal" water. Our results reveal that at high hydration lev...

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Bibliographic Details
Published in:The Journal of chemical physics 2014-11, Vol.141 (18), p.18C510-18C510
Main Authors: Cupane, Antonio, Fomina, Margarita, Schirò, Giorgio
Format: Article
Language:English
Subjects:
Biochemistry, Molecular Biology
Calorimetry, Differential Scanning
Cold Temperature
Crossovers
Gels
Hydration
Inelastic scattering
Life Sciences
Low temperature
Neutron scattering
Neutrons
Physics
Porosity
Silicon dioxide
Silicon Dioxide - chemistry
Structural Biology
Temperature dependence
Thermodynamics
Water - chemistry
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Summary:The Boson peak of deeply cooled water confined in the pores of a silica xerogel is studied by inelastic neutron scattering at different hydration levels to separate the contributions from matrix, water on the pore surfaces and "internal" water. Our results reveal that at high hydration level, where the contribution from internal water is dominant, the temperature dependence of the Boson peak intensity shows an inflection point at about 225 K. The complementary use of differential scanning calorimetry to describe the thermodynamics of the system allows identifying the inflection point as the signature of a water liquid-liquid crossover.
ISSN:0021-9606
1089-7690
DOI:10.1063/1.4895793