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Chin. Phys. B, 2021, Vol. 30(1): 016105    DOI: 10.1088/1674-1056/abb668
CONDENSED MATTER: STRUCTURAL, MECHANICAL, AND THERMAL PROPERTIES Prev   Next  

Dynamic crossover in [VIO2+][Tf2N-]2 ionic liquid

Gan Ren(任淦)†
Abstract  Ionic liquids usually behave as fragile liquids, and the temperature dependence of their dynamic properties obeys supper-Arrhenius law. In this work, a dynamic crossover is observed in ([VIO2+][Tf2N-]2) ionic liquid at the temperature of 240-800 K. The diffusion coefficient does not obey a single Arrhenius law or a Vogel-Fulcher-Tammann (VFT) relation, but can be well fitted by three Arrhenius laws or a combination of a VFT relation and an Arrhenius law. The origin of the dynamic crossover is analyzed from correlation, structure, and thermodynamics. Ion gets a stronger backward correlation at a lower temperature, as shown by the fractal dimension of the random walk. The temperature dependence function of fractal dimension, heterogeneity order parameter, and thermodynamic data can be separated into three regions similar to that observed in the diffusion coefficient. The two crossover temperatures observed in the three types of data are almost the same as that in diffusion coefficient fitted by three Arrhenius laws. The results indicate that the dynamic crossover of [VIO2+][Tf2N-]2 is attributed to the heterogeneous structure when it undergoes cooling.
Keywords:  ionic liquids      dynamic crossover      heterogeneity order parameter      fractal dimension      fragile  
Received:  29 July 2020      Revised:  20 August 2020      Accepted manuscript online:  09 September 2020
PACS:  61.20.Ja (Computer simulation of liquid structure)  
  61.20.Gy (Theory and models of liquid structure)  
Fund: Project supported by the Science Foundation of Civil Aviation Flight University of China (Grant Nos. J2019-059 and JG2019-19).
Corresponding Authors:  Corresponding author. E-mail: rengan@alumni.itp.ac.cn   

Cite this article: 

Gan Ren(任淦) Dynamic crossover in [VIO2+][Tf2N-]2 ionic liquid 2021 Chin. Phys. B 30 016105

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