Evidence of a fractional Debye-Stokes-Einstein law in supercooled o-terphenyl

by: L Andreozzi, A Dischino, M Giordano, D Leporini

Europhys. Lett., Vol. 38 (1997), pp. 669-674.

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Abstract

The rotational dynamics of nearly spherical and cylindrical tracers dissolved in supercooled o-terphenyl is studied via the Electron Spin Resonance spectroscopy. On decreasing the temperature, a sharp crossover is observed from the regime where the Debye-Stokes-Einstein law (DSE) holds to a new one which is accounted for by a fractional DSE (FDSE) Dr propto (η/T)-ξ with ξ ≤ 1. Dr is the rotational diffusion constant, η the shear viscosity and T the temperature. Tumbling and spinning of the cylindrical tracer exhibit distinct crossovers. A simple model of FDSE based on the presence of dynamic heterogeneities is presented.

@article{andreozzi97, abstract = {The rotational dynamics of nearly spherical and cylindrical tracers dissolved in supercooled o-terphenyl is studied via the Electron Spin Resonance spectroscopy. On decreasing the temperature, a sharp crossover is observed from the regime where the Debye-Stokes-Einstein law (DSE) holds to a new one which is accounted for by a fractional DSE (FDSE) Dr propto (η/T)-ξ with ξ ≤ 1. Dr is the rotational diffusion constant, η the shear viscosity and T the temperature. Tumbling and spinning of the cylindrical tracer exhibit distinct crossovers. A simple model of FDSE based on the presence of dynamic heterogeneities is presented.}, author = {Andreozzi, L. and Dischino, A. and Giordano, M. and Leporini, D. }, citeulike-article-id = {1995891}, doi = {http://dx.doi.org/10.1209/epl/i1997-00301-2}, journal = {Europhys. Lett.}, keywords = {diffusion, glass, otp, rotation}, pages = {669--674}, posted-at = {2007-11-27 18:40:18}, priority = {2}, title = {Evidence of a fractional Debye-Stokes-Einstein law in supercooled o-terphenyl}, url = {http://dx.doi.org/10.1209/epl/i1997-00301-2}, volume = {38}, year = {1997} }

RIS record

TY - JOUR ID - andreozzi97 L3 - citeulike-article-id:1995891 TI - Evidence of a fractional Debye-Stokes-Einstein law in supercooled o-terphenyl JF - Europhys. Lett. VL - 38 SP - 669 EP - 674 N2 - The rotational dynamics of nearly spherical and cylindrical tracers dissolved in supercooled o-terphenyl is studied via the Electron Spin Resonance spectroscopy. On decreasing the temperature, a sharp crossover is observed from the regime where the Debye-Stokes-Einstein law (DSE) holds to a new one which is accounted for by a fractional DSE (FDSE) Dr propto (η/T)-ξ with ξ ≤ 1. Dr is the rotational diffusion constant, η the shear viscosity and T the temperature. Tumbling and spinning of the cylindrical tracer exhibit distinct crossovers. A simple model of FDSE based on the presence of dynamic heterogeneities is presented. KW - diffusion KW - glass KW - otp KW - rotation AU - Andreozzi, L AU - Dischino, A AU - Giordano, M AU - Leporini, D PY - 1997/// UR - http://dx.doi.org/10.1209/epl/i1997-00301-2 ER -

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