Equilibrium and non-equilibrium type beta-relaxations: D-sorbitol versus o-terphenyl

Article Abstract:

A study reinvestigated the dielectric signatures of the alpha-relaxation and beta-relaxation o-terphenyl and D-sorbitol with a focus on the amplitude of the beta-relaxation near and below glass transition temperature. Evidence was found that the beta-process of O-terphenyl is associated with molecular motion which is featured only in the quenched glassy state. It appears possible that materials for which no beta-relaxation has yet been observed would simply have to be quenched faster to give rise to a beta-peak.

Research, Liquids, Amorphous substances, Amorphous materials, Dielectric relaxation, Relaxation phenomena, Relaxation (Physics)

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Dynamics of solvent and rotational relaxation of glycerol in the nanocavity of reverse micelles

Article Abstract:

Steady-state and time-resolved fluorescence spectroscopy are used to investigate the dynamics of solvent and rotational relaxation of Coumarin 480 and Coumarin 490 in glycerol containing bis-2-ethyl hexyl sulfosuccinate sodium salt (AOT) reverse micelles. The results have shown that solvent relaxation times decreased with increasing glycerol content in the reverse micellar pool and rotational relaxation times increased with increase in glycerol content.

Anisotropy, Fluorescence spectroscopy

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Binary glass-forming materials: mixtures of sorbitol and glycerol

Article Abstract:

The dynamics of sorbitol/glycerol mixtures across the entire composition range has been characterized by dielectric relaxation measurements for frequencies between 10mHz and 10MHz. The gradual change in the glass transition temperature (Tg), fragility (m), nonexponentiality and occurrence of a secondary Johari-Goldstein type relaxation as a function of the mole fraction is explored.

Industrial organic chemicals, not elsewhere classified, Sorbitol, Transition temperature, Phase transition temperatures

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