TY  - JOUR
A1  - Sangoro, J. R.
A1  - Iacob, C.
A1  - Naumov, S.
A1  - Valiullin, R.
A1  - Rexhausen, Hans
A1  - Hunger, J.
A1  - Buchner, R.
A1  - Strehmel, Veronika
A1  - Kaerger, J.
A1  - Kremer, F.
T1  - Diffusion in ionic liquids the interplay between molecular structure and dynamics
JF  - Soft matter
N2  - Diffusion in a series of ionic liquids is investigated by a combination of Broadband Dielectric Spectroscopy (BDS) and Pulsed Field Gradient Nuclear Magnetic Resonance (PFG NMR). It is demonstrated that the mean jump lengths increase with the molecular volumes determined from quantum-chemical calculations. This provides a direct means-via Einstein-Smoluchowski relation-to determine the diffusion coefficient by BDS over more than 8 decades unambiguously and in quantitative agreement with PFG NMR measurements. New possibilities in the study of charge transport and dynamic glass transition in ionic liquids are thus opened.
Y1  - 2011
U6  - https://doi.org/10.1039/c0sm01404d
SN  - 1744-683X
VL  - 7
IS  - 5
SP  - 1678
EP  - 1681
PB  - Royal Society of Chemistry
CY  - Cambridge
ER  - 
TY  - JOUR
A1  - Sangoro, Joshia R.
A1  - Iacob, C.
A1  - Agapov, A. L.
A1  - Wang, Yangyang
A1  - Berdzinski, Stefan
A1  - Rexhausen, Hans
A1  - Strehmel, Veronika
A1  - Friedrich, C.
A1  - Sokolov, A. P.
A1  - Kremer, F.
T1  - Decoupling of ionic conductivity from structural dynamics in polymerized ionic liquids
JF  - Soft matter
N2  - Charge transport and structural dynamics in low molecular weight and polymerized 1-vinyl-3-pentylimidazolium bis(trifluoromethylsulfonyl) imide ionic liquids (ILs) are investigated by a combination of broadband dielectric spectroscopy, dynamic mechanical spectroscopy and differential scanning calorimetry. While the dc conductivity and fluidity exhibit practically identical temperature dependence for the non-polymerized IL, a significant decoupling of ionic conduction from structural dynamics is observed for the polymerized IL. In addition, the dc conductivity of the polymerized IL exceeds that of its molecular counterpart by four orders of magnitude at their respective calorimetric glass transition temperatures. This is attributed to the unusually high mobility of the anions especially at lower temperatures when the structural dynamics is significantly slowed down. A simple physical explanation of the possible origin of the remarkable decoupling of ionic conductivity from structural dynamics is proposed.
Y1  - 2014
U6  - https://doi.org/10.1039/c3sm53202j
SN  - 1744-683X
SN  - 1744-6848
VL  - 10
IS  - 20
SP  - 3536
EP  - 3540
PB  - Royal Society of Chemistry
CY  - Cambridge
ER  -