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Colloidal tracer particles suspended in these glass formers allow the investigation of their dynamics with coherent synchrotron radiation by means of X-ray photon correlation spectroscopy. The static structure factors, the relaxation times and the dispersion relations of the tracer particles were determined as function of the solvent temperature. The results show that the nature of the particles dynamics in the glass former changes close to the glass transition temperature (Tg) between 1.08 − 1.12 Tg. While the static structure factor remains unchanged in this temperature range, the particle dynamics changes from free diffusion at T > 1.12 Tg to hyper diffusive and correlated particle motion at T < 1.08 Tg. By comparing samples of different particle sizes and concentrations it becomes evident that this change in the dynamics is related to changes of the solvent properties. These changes are accompanied by an increasing heterogeneity in the dynamics of the tracer particles. The findings are in agreement with an interpretation that domains of correlated dynamics in the supercooled glass formers grow in size with decreasing temperature.","descriptionType":"Abstract"},{"description":"Published by University of Hamburg, 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