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

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Abstract

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 thatat 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.
Lingua originaleEnglish
pagine (da-a)1-7
Numero di pagine7
RivistaTHE JOURNAL OF CHEMICAL PHYSICS
Volume141
Stato di pubblicazionePublished - 2014

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crossovers
bosons
liquids
inflection points
water
hydration
porosity
xerogels
inelastic scattering
neutron scattering
heat measurement
signatures
silicon dioxide
thermodynamics
temperature dependence
scanning
matrices

All Science Journal Classification (ASJC) codes

  • Physics and Astronomy(all)
  • Physical and Theoretical Chemistry

Cita questo

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title = "The boson peak of deeply cooled confined water reveals the existence of a low temperature liquid-liquid crossover",
abstract = "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 thatat 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.",
author = "Antonio Cupane and Margarita Fomina and Giorgio Schir{\`o}",
year = "2014",
language = "English",
volume = "141",
pages = "1--7",
journal = "Journal of Chemical Physics",
issn = "0021-9606",
publisher = "American Institute of Physics",

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T1 - The boson peak of deeply cooled confined water reveals the existence of a low temperature liquid-liquid crossover

AU - Cupane, Antonio

AU - Fomina, Margarita

AU - Schirò, Giorgio

PY - 2014

Y1 - 2014

N2 - 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 thatat 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.

AB - 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 thatat 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.

UR - http://hdl.handle.net/10447/97145

M3 - Article

VL - 141

SP - 1

EP - 7

JO - Journal of Chemical Physics

JF - Journal of Chemical Physics

SN - 0021-9606

ER -