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Rotational Dynamics of a Molecular Probe in Tri-Cresyl Phosphate: From “Stick” to “Slip” Boundary Conditions

Published online by Cambridge University Press:  10 February 2011

M. G. Bagliesi ,
F. Cianflone  and
D. Leporini
M. G. Bagliesi
Affiliation:
Dipartimento di Fisica, Universita' di Pisa, Piazza Torricelli 2, 1–56100 PisaITALY, leporini@ipifidpt.difi.unipi.it
F. Cianflone
Affiliation:
Dipartimento di Fisica, Universita' di Pisa, Piazza Torricelli 2, 1–56100 PisaITALY, leporini@ipifidpt.difi.unipi.it INFM, UdR Pisa
D. Leporini
Affiliation:
Dipartimento di Fisica, Universita' di Pisa, Piazza Torricelli 2, 1–56100 PisaITALY, leporini@ipifidpt.difi.unipi.it INFM, UdR Pisa
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Abstract

The rotational dynamics of a molecular probe dissolved in the glass-former tri-cresyl phospate has been studied by linear and non-linear Electron Spin Resonance spectroscopy. At the highest temperatures the Debye-Stokes-Einstein (DSE) law with stick boundary conditions holds. On cooling, a transition region is crossed and then a new regime sets in which is accounted for by the DSE law provided that slip boundary conditions are assumed. At the lowest temperatures the rotational diffusion and the shear viscosity are decoupled. The onset of the decoupling takes place close to Tc, the critical temperature predicted by the Mode Coupling Theory.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 455: Symposium T – Glasses and Glass Formers–Current Issues , 1996 , 157
Copyright
Copyright © Materials Research Society 1997

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References

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