Search results for "PACS: 64.70.Ja"

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Experimental evidence for a liquid-liquid crossover in deeply cooled confined water.

2014

International audience; In this work we investigate, by means of elastic neutron scattering, the pressure dependence of mean square displacements (MSD) of hydrogen atoms of deeply cooled water confined in the pores of a three-dimensional disordered SiO 2 xerogel; experiments have been performed at 250 and 210 K from atmospheric pressure to 1200 bar. The " pressure anomaly " of supercooled water (i.e., a mean square displacement increase with increasing pressure) is observed in our sample at both temperatures; however, contrary to previous simulation results and to the experimental trend observed in bulk water, the pressure effect is smaller at lower (210 K) than at higher (250 K) temperatur…

liquid-liquid transitionPhase transitionPACS: 64.70.Ja 64.70.pm 25.40.DnMaterials scienceNeutron diffractionGeneral Physics and AstronomyThermodynamicsNeutron scatteringSettore FIS/03 - Fisica Della MateriaPhase TransitionNuclear magnetic resonanceWater Movementsglass transitionElastic neutron scattering[PHYS.COND]Physics [physics]/Condensed Matter [cond-mat]SupercoolingElastic neutron scattering; calorimetry; glass transition; liquid-liquid transitionAtmospheric pressure[SDV.BBM.BS]Life Sciences [q-bio]/Biochemistry Molecular Biology/Structural Biology [q-bio.BM]Calorimetry Differential ScanningWaterSilicon DioxideSettore FIS/07 - Fisica Applicata(Beni Culturali Ambientali Biol.e Medicin)Cold Temperature[SDV.BBM.BS]Life Sciences [q-bio]/Biochemistry Molecular Biology/Biomolecules [q-bio.BM]Neutron DiffractionModels ChemicalGlass transitioncalorimetryHydrophobic and Hydrophilic InteractionsAmbient pressureBar (unit)HydrogenPhysical review letters
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