Glasslike Behavior in Aqueous Electrolyte Solutions

Details Glasslike Behavior in Aqueous Electrolyte Solutions Glasslike Behavior in Aqueous Electrolyte Solutions

2009-04-04

arxiv.org/abs/0904.0717v1

J. Chem. Phys. Communication, 128, 161102 (2008)

Physics

Chemical Physics

Scientific paper

10.1063/1.2906132

When salts are added to water, the viscosity generally increases suggesting the ions increase the strength of the water's hydrogen-bond network. However, infrared pump-probe measurements on electrolyte solutions have found that ions have no influence on the rotational dynamics of water molecules implying no enhance-ment or breakdown of the hydrogen-bond network. Here we report optical Kerr-effect and dielectric relaxa-tion spectroscopic measurements, which have enabled us to separate the effects of rotational and transitional motions of the water molecules. These data show that electrolyte solutions behave like a supercooled liquid approaching a glass transition in which rotational and translational molecular motions are decoupled. It is now possible to understand previously conflicting viscosity data, nuclear magnetic resonance relaxation, and ultrafast infrared spectroscopy in a single unified picture.

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