Jensen M H, Gainaru C, Alba-Simionesco C, Hecksher T, Niss K
Glass & Time, IMFUFA, Department of Science and Environment, Roskilde University, P.O. Box 260, DK-4000 Roskilde, Denmark.
Phys Chem Chem Phys. 2018 Jan 17;20(3):1716-1723. doi: 10.1039/c7cp06482a.
Glycerol-water mixtures were studied at molar concentrations ranging from x = 1 (neat glycerol) to x = 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.
使用剪切机械光谱法研究了摩尔浓度范围从x = 1（纯甘油）到x = 0.3的甘油 - 水混合物。我们在纯甘油中观察到一种低频模式，类似于已报道的一元醇的情况。这种模式没有介电对应物，并且随着水浓度的增加而消失。我们提出，甘油分子之间形成的氢键网络是观察到的慢模式的原因，并且水作为整体动力学的增塑剂以及作为润滑剂，软化了氢键对该二元体系宏观粘度的贡献。
