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- W2068804771 abstract "Homogeneous diethyl phthalate/phenylphthalein-dimethylether (DEP/PDE) mixtures have been investigated by means of broadband dielectric spectroscopy. Contrarily to the widespread view that homogenous binary mixtures should give rise to a single glass transition, the mixture displays two dynamics giving rise to two glass transitions. Such a finding can be rationalized invoking the self-concentration concept that relies on the localized nature of the glass transition phenomenon. In such a way, the analogy with miscible polymer blends, for which this concept has been introduced, is highlighted. A model based on the combination of the Adam-Gibbs (AG) theory of the glass transition and the self-concentration concept resulted to be fully predictive once the only unknown variable, namely, the glass-former specific parameter $(ensuremath{alpha})$ connecting the characteristic length for the glass transition to the configurational entropy, is extracted applying the model itself to DEP/toluene and DEP/PDE solutions highly concentrated, respectively, in DEP and PDE. The $ensuremath{alpha}$ parameter obtained in such a way allows the precise determination of the most probable relaxation time even for those DEP/PDE mixtures displaying a strong overlap of the dielectric response. The model incorporating the self-concentration concept to the AG theory also provides the characteristic length scale for the glass transition for both DEP and PDE. Such a length scale was found to be on the order of 1--2 nm. This is comparable to that obtained for other glass formers." @default.
- W2068804771 created "2016-06-24" @default.
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- W2068804771 date "2009-10-27" @default.
- W2068804771 modified "2023-10-16" @default.
- W2068804771 title "Dynamical heterogeneity in binary mixtures of low-molecular-weight glass formers" @default.
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- W2068804771 doi "https://doi.org/10.1103/physreve.80.041505" @default.
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