Temperature dependence of the electrical conductivity of imidazolium ionic liquids.
The electrical conductivities of 1-alkyl-3-methylimidazolium tetrafluoroborate ionic liquids and of 1-hexyl-3-methylimidazolium ionic liquids with different anions were determined in the temperature range between 123 and 393 K on the basis of dielectric measurements in the frequency range from 1 to 10(7) Hz. Most of the ionic liquids form a glass and the conductivity values obey the Vogel-Fulcher-Tammann equation. The glass transition temperatures are increasing with increasing length of the alkyl chain. The fragility is weakly dependent on the alkyl chain length but is highly sensitive to the structure of the anion.
Leys
Jan
J
Laboratorium voor Akoestiek en Thermische Fysica, Departement Natuurkunde en Sterrenkunde, Katholieke Universiteit Leuven, Celestijnenlaan 200D, bus 2416, 3001 Leuven, Belgium. jan.leys@fys.kuleuven.be
Wübbenhorst
Michael
M
Preethy Menon
Chirukandath
C
Rajesh
Ravindran
R
Thoen
Jan
J
Glorieux
Christ
C
Nockemann
Peter
P
Thijs
Ben
B
Binnemans
Koen
K
Longuemart
Stéphane
S
D000473:Alkanes / Q000737:chemistry*; D001881:Borates; D001888:Boric Acids / Q000737:chemistry*; D004553:Electric Conductivity; D007093:Imidazoles / Q000737:chemistry*; D052578:Ionic Liquids / Q000737:chemistry*; D012680:Sensitivity and Specificity; D013696:Temperature
D000473:Alkanes; D001881:Borates; D001888:Boric Acids; D007093:Imidazoles; D052578:Ionic Liquids; C098759:fluoroboric acid