Identifying the structural relaxation dynamics in a strongly asymmetric binary glass former
Autor: | Zijing Li, Li-Min Wang, Yingdan Liu, Xiao Jin, Shidong Feng |
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Rok vydání: | 2021 |
Předmět: |
Materials science
Dynamical decoupling 010304 chemical physics Dynamics (mechanics) General Physics and Astronomy Binary number Thermodynamics Dielectric 010402 general chemistry 01 natural sciences 0104 chemical sciences 0103 physical sciences Exponent Relaxation (physics) Physical and Theoretical Chemistry Dispersion (chemistry) Glass transition |
Zdroj: | The Journal of Chemical Physics. 154:144504 |
ISSN: | 1089-7690 0021-9606 |
DOI: | 10.1063/5.0046361 |
Popis: | Here, we provide calorimetric and dielectric studies in asymmetric binary mixtures constituted by 2-picoline and triphenylethylene. Extreme broadening of the calorimetric glass transition is observed in the mixtures, which is accompanied by a large mismatch of the glass transition temperatures defined by the two techniques. As large broadening in the relaxation dispersion is identified in the mixtures of intermediate concentrations, strong temperature dependence of the relaxation dispersion is detected. The relation between the stretching exponent and non-linear factor derived from the Tool-Narayanaswamy-Moynihan-Hodge model shows a remarkable shift from the one established by pure molecular glass formers and symmetric mixtures. The unusual behaviors suggest an extreme dynamical decoupling mode imposed by the occurrence of strong concentration fluctuation. |
Databáze: | OpenAIRE |
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