Journal
JOURNAL OF NON-CRYSTALLINE SOLIDS
Volume 407, Issue -, Pages 355-360Publisher
ELSEVIER
DOI: 10.1016/j.jnoncrysol.2014.08.010
Keywords
Diverging processes; Dynamic crossover; Fragile to strong transition; Glass forming materials; Soft-matter
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The dynamics of a hierarchical colloid solution, dendrimer in methanol, has been studied using photon-correlation spectroscopy (PCS). The obtained relaxation curves are analyzed accordihg to the mode-coupling theory (MCT). The main results are: i) the occurrence of a fragile to strong dynamical crossover as a function of the packing fraction at phi(c) similar or equal to 0.39, and ii) the observation of a secondary relaxation (beta) that has its onset just at the dynamical crossover and is correlated with the primary alpha-relaxation. Finally we discuss the obtained findings in comparison with recent experiments in similar systems characterized by an attractive interaction obtaining a confirmation on the primary role of the dynamical crossover in the physics of the dynamical arrest. (c) 2014 Elsevier B.V. All rights reserved.
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