Decoupling charge transport from the structural dynamics in room temperature ionic liquids

Griffin, Phillip; Agapov, Alexander L.; Kisliuk, Alexander; Sun, Xiao-Guang; Dai, Sheng; Novikov, Vladimir; Sokolov, Alexei P.

doi:10.1063/1.3638269

Title: Decoupling charge transport from the structural dynamics in room temperature ionic liquids

Journal Article · Thu Sep 01 00:00:00 EDT 2011 · Journal of Chemical Physics

DOI:https://doi.org/10.1063/1.3638269· OSTI ID:1041098

Griffin, Phillip ^[1]; Agapov, Alexander L. ^[2]; Kisliuk, Alexander ^[2];

^[2];

^[2]; Novikov, Vladimir ^[2];

^[2]

University of Tennessee (UTK) and Oak Ridge National Laboratory (ORNL)
ORNL

Light scattering and dielectric spectroscopy measurements were performed on the room temperature ionic liquid (RTIL) [C4mim][NTf2] in a broad temperature and frequency range. Ionic conductivity was used to estimate self-diffusion of ions, while light scattering was used to study structural relaxation. We demonstrate that the ionic diffusion decouples from the structural relaxation processes the temperature of the sample decreases toward Tg. The strength of the decoupling appears to be significantly lower than that expected for a supercooled liquid of similar fragility. The structural relaxation process in the RTIL follows well the high-temperature mode coupling theory (MCT) scenario.Using the MCT analysis we estimated the dynamic crossover temperature in [C4mim][NTf2]to be Tc ~ 225 ± 5 K. However, our analysis reveals no sign of the dynamic crossover in the ionic diffusion process.

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Research Organization:: Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)

Sponsoring Organization:: USDOE

DOE Contract Number:: AC05-00OR22725

OSTI ID:: 1041098

Journal Information:: Journal of Chemical Physics, Vol. 135, Issue 11; ISSN 0021-9606

Publisher:: American Institute of Physics (AIP)

Country of Publication:: United States

Language:: English

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Title: Decoupling charge transport from the structural dynamics in room temperature ionic liquids

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