Pressure Effect on the Boson Peak in Deeply Cooled Confined Water: Evidence of a Liquid-Liquid Transition.
Phys Rev Lett
; 115(23): 235701, 2015 Dec 04.
Article
em En
| MEDLINE
| ID: mdl-26684125
ABSTRACT
The boson peak in deeply cooled water confined in nanopores is studied to examine the liquid-liquid transition (LLT). Below â¼180 K, the boson peaks at pressures P higher than â¼3.5 kbar are evidently distinct from those at low pressures by higher mean frequencies and lower heights. Moreover, the higher-P boson peaks can be rescaled to a master curve while the lower-P boson peaks can be rescaled to a different one. These phenomena agree with the existence of two liquid phases with different densities and local structures and the associated LLT in the measured (P, T) region. In addition, the P dependence of the librational band also agrees with the above conclusion.
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MEDLINE
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En
Ano de publicação:
2015
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Article