Abstract
Glycerol-water mixtures were studied at molar concentrations ranging from xgly = 1 (neat glycerol) to xgly = 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.
Original language | English |
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Pages (from-to) | 1716-1723 |
Number of pages | 8 |
Journal | Physical Chemistry Chemical Physics |
Volume | 20 |
Issue number | 3 |
DOIs | |
State | Published - 2018 |
Externally published | Yes |
Funding
We thank Ivan Popov and Prof. Yuri Feldmann for making the dielectric data of ref. 14 available in electronic form. The following funding bodies are acknowledged: Danish Council for Independent Research (Sapere Aude: Starting Grant), the Danish National Research Foundation (DNRF61) and Laboratoire Léon Brillouin (UMR CEA-CNRS, Paris-Saclay).
Funders | Funder number |
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Laboratoire Léon Brillouin | |
UMR CEA-CNRS | |
Natur og Univers, Det Frie Forskningsråd | |
Danmarks Grundforskningsfond | DNRF61 |