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Review

Fast Vibrational Modes and Slow Heterogeneous Dynamics in Polymers and Viscous Liquids

1
Dipartimento di Fisica “Enrico Fermi”, Università di Pisa, Largo B. Pontecorvo 3, I-56127 Pisa, Italy
2
Istituto per i Processi Chimico-Fisici-Consiglio Nazionale delle Ricerche (IPCF-CNR), via G. Moruzzi 1, I-56124 Pisa, Italy
*
Author to whom correspondence should be addressed.
Int. J. Mol. Sci. 2019, 20(22), 5708; https://doi.org/10.3390/ijms20225708
Received: 25 October 2019 / Revised: 7 November 2019 / Accepted: 8 November 2019 / Published: 14 November 2019
(This article belongs to the Section Macromolecules)
Many systems, including polymers and molecular liquids, when adequately cooled and/or compressed, solidify into a disordered solid, i.e., a glass. The transition is not abrupt, featuring progressive decrease of the microscopic mobility and huge slowing down of the relaxation. A distinctive aspect of glass-forming materials is the microscopic dynamical heterogeneity (DH), i.e., the presence of regions with almost immobile particles coexisting with others where highly mobile ones are located. Following the first compelling evidence of a strong correlation between vibrational dynamics and ultraslow relaxation, we posed the question if the vibrational dynamics encodes predictive information on DH. Here, we review our results, drawn from molecular-dynamics numerical simulation of polymeric and molecular glass-formers, with a special focus on both the breakdown of the Stokes–Einstein relation between diffusion and viscosity, and the size of the regions with correlated displacements. View Full-Text
Keywords: glass transition; dynamical heterogeneity; Debye–Waller factor; diffusion; Stokes–Einstein relation glass transition; dynamical heterogeneity; Debye–Waller factor; diffusion; Stokes–Einstein relation
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MDPI and ACS Style

Puosi, F.; Tripodo, A.; Leporini, D. Fast Vibrational Modes and Slow Heterogeneous Dynamics in Polymers and Viscous Liquids. Int. J. Mol. Sci. 2019, 20, 5708. https://doi.org/10.3390/ijms20225708

AMA Style

Puosi F, Tripodo A, Leporini D. Fast Vibrational Modes and Slow Heterogeneous Dynamics in Polymers and Viscous Liquids. International Journal of Molecular Sciences. 2019; 20(22):5708. https://doi.org/10.3390/ijms20225708

Chicago/Turabian Style

Puosi, Francesco, Antonio Tripodo, and Dino Leporini. 2019. "Fast Vibrational Modes and Slow Heterogeneous Dynamics in Polymers and Viscous Liquids" International Journal of Molecular Sciences 20, no. 22: 5708. https://doi.org/10.3390/ijms20225708

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