On the mutual relationships between spin probe mobility, free volume and relaxation dynamics in organic glass-formers: Glycerol
Abstract
The rotation dynamics of the spin probe TEMPO in glycerol from ESR is compared with the ortho-positronium (o-Ps) annihilation from PALS and interpreted using the relaxation dynamics from BDS. Rotation time scale within the slow motion regime exhibits two Arrhenius regions with the characteristic ESR temperature, TX1τ, close to the characteristic PALS temperature, Tb1L, which is related to the secondary β process above Tg. Next, a slow to fast motion regime transition at the characteristic ESR temperature, Tcτ, close to the characteristic PALS temperature, Tb2L, followed by non-Arrhenius fast motion regime region is fully coupled with the primary α process.
- Publication:
-
Chemical Physics Letters
- Pub Date:
- February 2017
- DOI:
- 10.1016/j.cplett.2016.12.064
- Bibcode:
- 2017CPL...670...58B
- Keywords:
-
- Molecular mobility;
- ESR;
- Free volume;
- PALS;
- Relaxation dynamics;
- BDS