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Issue 3, 2018
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Slow rheological mode in glycerol and glycerol–water mixtures

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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.

Graphical abstract: Slow rheological mode in glycerol and glycerol–water mixtures

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Article information


Submitted
21 Sep 2017
Accepted
12 Dec 2017
First published
12 Dec 2017

Phys. Chem. Chem. Phys., 2018,20, 1716-1723
Article type
Paper

Slow rheological mode in glycerol and glycerol–water mixtures

M. H. Jensen, C. Gainaru, C. Alba-Simionesco, T. Hecksher and K. Niss, Phys. Chem. Chem. Phys., 2018, 20, 1716
DOI: 10.1039/C7CP06482A

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