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• W3217419163 abstract "Combining differential scanning calorimetry, nuclear magnetic resonance, and broadband dielectric spectroscopy studies, we ascertain the glass transition of aqueous ethylene glycol (EG) solutions, in particular the effects of partial crystallization on their glassy slowdown. For the completely liquid solutions in the weakly supercooled regime, it is found that the dynamics of the components occur on very similar time scales, rotational and translational motions are coupled, and the structural (α) relaxation monotonously slows down with increasing EG concentration. Upon cooling, partial crystallization strongly alters the glassy dynamics of EG-poor solutions; in particular, it strongly retards the α relaxation of the remaining liquid fraction, causing a non-monotonous concentration dependence, and it results in a crossover from non-Arrhenius to Arrhenius temperature dependence. In the deeply supercooled regime, a recrossing of the respective α-relaxation times results from the Arrhenius behaviors of the partially frozen EG-poor solutions together with the non-Arrhenius behavior of the fully liquid EG-rich solutions. Exploiting the isotope selectivity of nuclear magnetic resonance, we observe different rotational dynamics of the components in this low-temperature range and determine the respective contributions to the ν relaxation decoupling from the α relaxation when the glass transition is approached. The results suggest that the ν process, which is usually regarded as a water process, actually also involves the EG molecules. In addition, we show that various kinds of partially crystalline aqueous systems share a common relaxation process, which is associated with the frozen fraction and differs from that of bulk hexagonal ice." @default.
• W3217419163 created "2021-12-06" @default.
• W3217419163 creator A5001598276 @default.
• W3217419163 creator A5048956756 @default.
• W3217419163 creator A5056642092 @default.
• W3217419163 date "2021-12-08" @default.
• W3217419163 modified "2023-10-01" @default.
• W3217419163 title "Effects of partial crystallization on the glassy slowdown of aqueous ethylene glycol solutions" @default.
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• W3217419163 doi "https://doi.org/10.1063/5.0075457" @default.
• W3217419163 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/34911309" @default.
• W3217419163 hasPublicationYear "2021" @default.
• W3217419163 type Work @default.
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• W3217419163 hasAuthorship W3217419163A5001598276 @default.
• W3217419163 hasAuthorship W3217419163A5048956756 @default.
• W3217419163 hasAuthorship W3217419163A5056642092 @default.

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