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Decoupling Between Structural and Conductivity Relaxation in Aprotic Ionic Liquids

  • Evgeni Shoifet
  • Sergey P. Verevkin
  • Christoph Schick
Chapter
Part of the Advances in Dielectrics book series (ADVDIELECT)

Abstract

For the [CnMIm][NTf2] ionic liquids with n = 4, 6, and 8 the dynamic calorimetric glass transition temperature T g,dyn was determined in a wide frequency range from 10−2 to 105 rad s−1. The calorimetric glass transition temperature or vitrification temperature T g from standard DSC with 10 K min−1 cooling rate was determined too. The obtained value for T g in these ionic liquids is in very good agreement with the calorimetric T g,dyn at 100 s relaxation time. The obtained calorimetric data are compared to conductivity and other relaxation data available in the literature. In a relaxation map at short relaxation times (τ < 1 µs), conductivity relaxation and calorimetric relaxation show a similar behavior. However, at low frequencies a significant decoupling between conductivity and calorimetric data is observed. Similar to other ionic conductors, the conductivity relaxation has a weaker temperature dependency than structural relaxation. Interestingly, there is no break in the conductivity data when crossing T g. This is different from many other systems.

Keywords

Ionic Liquid Room Temperature Ionic Liquid Calorimetric Data Conductivity Relaxation Vitrification Temperature 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

Notes

Acknowledgment

We acknowledge M. Ahrenberg for the measurements with the vacuum AC calorimeter.

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Copyright information

© Springer International Publishing Switzerland 2016

Authors and Affiliations

  • Evgeni Shoifet
    • 1
    • 2
  • Sergey P. Verevkin
    • 2
    • 3
  • Christoph Schick
    • 1
    • 2
  1. 1.Institute of PhysicsUniversity of RostockRostockGermany
  2. 2.Department Life Light and MatterCompetence Center CALORRostockGermany
  3. 3.Institute of Physical ChemistryUniversity of RostockRostockGermany

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