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Issue 16, 2018
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ESR evidence of the dynamic crossover in the supercooled liquid states of a series of solid n-alkanes

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Abstract

A study of the rotation dynamics of the spin probe TEMPO by electron spin resonance (ESR) spectroscopy in a series of six short- and medium-sized n-alkanes is presented. In addition to the usual crossover effects connected with solid–liquid phase transitions at temperature Tm and the solid–solid transition at Tss, we find a strong correlation between the change in reorientation at the characteristic ESR temperature TfastX1 < Tss and/or Tm with the ratio TfastX1/Tm = 0.76 ± 0.03 and the characteristic dynamic temperature, TX, obtained from the viscosity data. This indicates the presence of local disordered regions in the crystalline structure which is indeed sensitive to dynamic change at the crossover temperature TXTfastX1.

Graphical abstract: ESR evidence of the dynamic crossover in the supercooled liquid states of a series of solid n-alkanes

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Article information


Submitted
09 Jan 2018
Accepted
20 Mar 2018
First published
20 Mar 2018

Phys. Chem. Chem. Phys., 2018,20, 11145-11151
Article type
Paper

ESR evidence of the dynamic crossover in the supercooled liquid states of a series of solid n-alkanes

J. Bartoš, C. Corsaro, D. Mallamace, H. Švajdlenková and M. Lukešová, Phys. Chem. Chem. Phys., 2018, 20, 11145
DOI: 10.1039/C8CP00175H

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