The boson peak of deeply cooled confined water reveals the existence of a low-temperature liquid-liquid crossover. - Archive ouverte HAL Access content directly
Journal Articles Journal of Chemical Physics Year : 2014

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

Antonio Cupane
  • Function : Author
Margarita Fomina
  • Function : Author
Giorgio Schirò

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 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.
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Dates and versions

hal-01131241 , version 1 (13-03-2015)

Identifiers

  • HAL Id : hal-01131241 , version 1
  • PUBMED : 25399175

Cite

Antonio Cupane, Margarita Fomina, Giorgio Schirò. The boson peak of deeply cooled confined water reveals the existence of a low-temperature liquid-liquid crossover.. Journal of Chemical Physics, 2014, 141 (18), pp.18C510. ⟨hal-01131241⟩
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