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Article Dans Une Revue Physical Chemistry Chemical Physics Année : 2018

Slow rheological mode in glycerol and glycerol–water mixtures

Mikkel H. Jensen
  • Fonction : Auteur
Catalin Gainaru
  • Fonction : Auteur
Tina Hecksher
  • Fonction : Auteur
Kristine Niss
  • Fonction : Auteur

Résumé

Glycerol-water mixtures were studied at molar concentrations ranging from $x_\text{gly} = 1$ (pure glycerol) to $x_\text{gly}=0.3$ using shear mechanical spectroscopy. We observed a low frequency mode in neat glycerol, similar to what is usually reported for monohydroxy alcohols. This mode has no dielectric counterpart and disappears with increased water concentration. We propose that the hydrogen-bonded network formed between glycerol molecules is responsible for the observed slow mode and that water acts as a plasticizer for the overall dynamics and as a lubricant softening the hydrogen-bonding contribution to the macroscopic viscosity of this binary system.

Dates et versions

hal-03035677 , version 1 (02-12-2020)

Identifiants

Citer

Mikkel H. Jensen, Catalin Gainaru, Christiane Alba-Simionesco, Tina Hecksher, Kristine Niss. Slow rheological mode in glycerol and glycerol–water mixtures. Physical Chemistry Chemical Physics, 2018, 20 (3), pp.1716-1723. ⟨10.1039/C7CP06482A⟩. ⟨hal-03035677⟩
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