Scaling of the rotational relaxation of tracers in o-terphenyl: a linear and nonlinear ESR study

Article Abstract:

A study of diffusion in liquids presents new experimental efforts designed to gain additional insights concerning the reorientation supercooled liquids. The study specifically investigated the rotational dynamics of stiff, molecular tracers with different symmetries in supercooled and glassy O-terphenyl both on the short-time and long-time scale. Among other results, it will be shown that the temperature dependence of the correlation times exhibits three clearly defined regimes on both the short- and long-time scales irrespective of the tracer.

Diffusion, Diffusion (Physics), Electron paramagnetic resonance spectroscopy, Rotational motion, Rotation (Motion)

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Molecular dynamics and crystallization behavior of chiral isooctyloxycyanobiphenyl as studied by dielectric relaxation spectroscopy

Article Abstract:

A study of the molecular motions in glass-forming liquids and amorphous polymers using a number of techniques reports on dielectric relaxation spectroscopy data for chiral isooctyloxycyanobiphenyl during both cooling and heating experiments. Isooctyloxycyanobiphenyl was found to initially form a supercooled liquid and then a glass upon cooling. It crystallized when the supercooled liquid was heated above glass transition temperature.

Molecular dynamics, Crystallization

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Nonexponential primary relaxation in supercooled salol

Article Abstract:

A study was conducted on the relaxation phenomena of supercooled liquids near the laboratory glass transition. The investigation applied a free-energy landscape model used for the analysis of alpha-relaxation in supercooled liquids to a reevaluation of the impulsive stimulated light scattering data and the results of dielectric observations obtained from experiments on supercooled salol. Findings and conclusions are discussed.

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