No fragile-to-strong crossover in LiCl-H2O solution |
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Authors: | Nakanishi Masahiro Griffin Philip Mamontov Eugene Sokolov Alexei P |
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Affiliation: | Department of Chemistry, University of Tennessee, Knoxville, Tennessee 37996, USA. |
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Abstract: | Dynamics of water, especially in the temperature range of the "no man's land", remain a mystery. We present detailed study of dynamics in aqueous LiCl solution that is often considered as a model for bulk water. We employ broadband dielectric and light scattering spectroscopy in a broad frequency and temperature range. Our analysis reveals no sign of the fragile-to-strong crossover (FSC) neither in structural relaxation nor in translational motions. Our experimental results combined with a large selection of literature data lead to the clear conclusion-there is no FSC in dynamics of aqueous solutions at T ~ 200-230 K. Instead, our analysis reveals appearance of the so-called excess wing at the high frequency tail of the structural relaxation peak. We discuss the localized nature of the relaxation process that contributes to the excess wing. |
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