6533b821fe1ef96bd127c43d
RESEARCH PRODUCT
The boson peak of deeply cooled confined water reveals the existence of a low-temperature liquid-liquid crossover.
Margarita FominaGiorgio SchiròAntonio Cupanesubject
liquid-liquid transition[SDV.BBM.BS] Life Sciences [q-bio]/Biochemistry Molecular Biology/Structural Biology [q-bio.BM]CrossovereducationGeneral Physics and Astronomyinelastic neutron scatteringInelastic neutron scatteringSettore FIS/03 - Fisica Della MateriaMatrix (geology)Differential scanning calorimetryPhysical and Theoretical ChemistryPhysics::Atmospheric and Oceanic PhysicsCondensed matter physicsCalorimetry Differential Scanning[SDV.BBM.BS]Life Sciences [q-bio]/Biochemistry Molecular Biology/Structural Biology [q-bio.BM]ChemistrySolvationwater anomalieWaterSilicon DioxideSettore FIS/07 - Fisica Applicata(Beni Culturali Ambientali Biol.e Medicin)Cold Temperaturewater anomalies; differential scanning calorimetry; inelastic neutron scattering; liquid-liquid transitionInflection pointChemical physicsThermodynamicsBoson peakdifferential scanning calorimetryGelsPorosityIntensity (heat transfer)description
International audience; 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.
| year | journal | country | edition | language |
|---|---|---|---|---|
| 2014-11-14 |