Journal
PHYSICAL CHEMISTRY CHEMICAL PHYSICS
Volume 20, Issue 3, Pages 1716-1723Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/c7cp06482a
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Funding
- Danish Council for Independent Research (Sapere Aude: Starting Grant)
- Danish National Research Foundation [DNRF61]
- Laboratoire Leon Brillouin (UMR CEA-CNRS, Paris-Saclay)
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Glycerol-water mixtures were studied at molar concentrations ranging from x(gly) = 1 (neat glycerol) to x(gly) = 0.3 using shear mechanical spectroscopy. We observed a low frequency mode in neat glycerol, similar to what has been 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.
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