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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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Publication details

The article was received on 09 Jan 2018, accepted on 20 Mar 2018 and first published on 20 Mar 2018


Article type: Paper
DOI: 10.1039/C8CP00175H
Citation: Phys. Chem. Chem. Phys., 2018, Advance Article
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    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, Advance Article , DOI: 10.1039/C8CP00175H

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