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IRTG / Soft Matter Science
Stefan-Meier-Str. 21
79104 Freiburg, Germany

+49 761 203 678 34
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You are here: Home Events Prof. Alessio Zaccone "Towards predictive atomistic theory & simulations of dynamic mechanical response of glassy polymers based on the underlying vibrational spectrum"

Prof. Alessio Zaccone "Towards predictive atomistic theory & simulations of dynamic mechanical response of glassy polymers based on the underlying vibrational spectrum"

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Department of Chemical Engineering and Biotechnology, University of Cambridge, United Kingdom

What
  • Seminar
When Dec 06, 2017
from 02:10 PM to 03:00 PM
Where Seminarraum A, FMF, Stefan-Meier-Str. 21, Freiburg
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I will present theoretical results on how collective vibrational excitations in disordered solids can be used to predict macroscopic quantities such as the dielectric and the viscoelastic moduli of a variety of different disordered materials (polymers, metals etc). Focusing on polymers, this approach, which extends ordinary lattice dynamics to disordered dissipative systems, leads to the unprecedented possibility of performing atomic-level predictions of the dynamic mechanical response (e.g. G'(w), G''(w), G(t) etc) of glassy polymers over the entire range of deformation rates/frequencies, whereas standard atomistic simulations are confined to exceedingly high rates that are useless for applications. This framework also provides the possibility of inferring the mechanical response from Brillouin and Raman spectroscopy measurements. The results obtained within this approach, furthermore, shed light on some longstanding issues in the physics of glasses, such as the nature of the glass transition itself, and the microscopic origin of the so-called boson peak (excess of non-Debye modes at low energy) that is responsible for the low-T specific heat anomaly of glasses.

 

invited by Dr. Maxim Dolgushev

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