Effect of water polyamorphism on the molecular vibrations of glycerol in its glassy aqueous solutions

A glassy dilute glycerol-water solution undergoes a mutual polyamorphic transition relating to the transition between high- and low-density amorphous ices of solvent water. The polyamorphic transition behavior depends on the glycerol concentration, indicating that the glycerol affects the water poly...

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Veröffentlicht in:The Journal of chemical physics 2016-07, Vol.145 (2), p.024501-024501
Hauptverfasser: Suzuki, Yoshiharu, Mishima, Osamu
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Mishima, Osamu
description A glassy dilute glycerol-water solution undergoes a mutual polyamorphic transition relating to the transition between high- and low-density amorphous ices of solvent water. The polyamorphic transition behavior depends on the glycerol concentration, indicating that the glycerol affects the water polyamorphism. Here, we used the glassy dilute glycerol-water solution of the solute molar fraction of 0.07 and examined the effect of the polyamorphic change in solvent water on the molecular vibrations of glycerol via Raman spectroscopy. It is found that the molecular vibration of glycerol in high-density liquid like solvent water is different from that in the low-density liquid like solvent water and that the change in the molecular vibration of glycerol is synchronized with the polyamorphic transition of solvent water. The dynamical change of the solute molecule relates to the polyamorphic state of solvent water. This result suggests that the polyamorphic fluctuation of water structure emanated from the presumed liquid-liquid critical point plays an important role for the function of aqueous solution under an ambient condition such as the conformational stability of solute, the functional expression of solute, and so on.
doi_str_mv 10.1063/1.4955318
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source American Institute of Physics (AIP) Journals; Alma/SFX Local Collection
subjects Aqueous solutions
Critical point
Density
Dilution
Glycerol
Glycerol-Water
Physics
Raman spectroscopy
Solvents
Variation
title Effect of water polyamorphism on the molecular vibrations of glycerol in its glassy aqueous solutions
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