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- W2016168599 abstract "There is a plethora of experimental data on the dynamics of water in mixtures with glycerol, ethylene glycol, ethylene glycol oligomers, poly(ethylene glycol) 400 and 600, propanol, poly(vinyl pyrro1idone), poly(vinyl methylether), and other substances. In spite of the differences in the water contents, the chemical compositions, and the glass transition temperatures Tg of these aqueous mixtures, a faster relaxation originating from the water (called the ν-process) is omnipresent, sharing the following common properties. The relaxation time τν has Arrhenius temperature dependence at temperatures below Tg of the mixture. The activation energies of τν all fall within a neighborhood of 50 kJ/mol. At the same temperature where mixtures are all in their glassy states, the values of τν of several mixtures are comparable. The Arrhenius temperature dependence of τν does not continue to higher temperatures and instead it crosses over to a stronger temperature dependence at temperatures above Tg. The dielectric relaxation strength of the ν-process, Δεν(T), has a stronger temperature dependence above Tg than below, mimicking the change of enthalpy, entropy, and volume when crossing Tg. These general property of the ν-process (except for the magnitude of the activation energy) had been found before in the secondary relaxation of the faster component in several binary nonaqueous mixtures. Other properties of the secondary relaxation in these nonaqueous mixtures have helped to identify it as the Johari-Goldstein (JG) secondary relaxation of the faster component. The similarities in properties lead us to conclude that the ν-processes in water mixtures are the JG secondary relaxations of water. The conclusion is reinforced by the processes behaving similarly to the ν-process found in 6 Å thick water layer (two molecular layers) in fully hydrated Na-vermiculite clay, and in water confined in molecular sieves, silica hydrogels, and poly(2-hydroxyethyl methacrylate) hydrogels." @default.
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- W2016168599 date "2007-06-22" @default.
- W2016168599 modified "2023-10-18" @default.
- W2016168599 title "The Johari−Goldstein β-Relaxation of Water" @default.
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- W2016168599 doi "https://doi.org/10.1021/jp071857m" @default.
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