On the ergodicity of supercooled molecular glass-forming liquids at the dynamical arrest: the o-terphenyl case
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Mallamace-2014-On the ergodicity.pdf
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Author(s)
Mallamace, Francesco
Corsaro, Carmelo
Leone, Nancy
Villari, Valentina
Micali, Norberto
Chen, Sow-Hsin
Date Issued
January 2014
Journal
Scientific Reports
Publisher
Nature Publishing Group
Citation
Mallamace, Francesco, Carmelo Corsaro, Nancy Leone, Valentina Villari, Norberto Micali, and Sow-Hsin Chen. “On the Ergodicity of Supercooled Molecular Glass-Forming Liquids at the Dynamical Arrest: The o-Terphenyl Case.” Sci. Rep. 4 (January 17, 2014).
Version
Final published version
Abstract
The dynamics of supercooled ortho-terphenyl has been studied using photon-correlation spectroscopy (PCS) in the depolarized scattering geometry. The obtained relaxation curves are analyzed according to the mode-coupling theory (MCT) for supercooled liquids. The main results are: i) the observation of the secondary Johari-Goldstein relaxation (β) that has its onset just at the dynamical crossover temperature T[subscript B] (T[subscript M] > T[subscript B] > T[subscript g]); ii) the confirmation, of the suggestion of a recent statistical mechanical study, that such a molecular system remains ergodic also below the calorimetric glass-transition temperature T[subscript g]. Our experimental data give evidence that the time scales of the primary (α) and this secondary relaxations are correlated. Finally a comparison with recent PCS experiments in a colloidal system confirms the primary role of the dynamical crossover in the physics of the dynamical arrest.
MIT Department
Massachusetts Institute of Technology. Department of Nuclear Science and Engineering
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DOI of Published Version
https://doi.org/10.1038/srep03747
