title: Temperature dependence of the electrical conductivity of imidazolium ionic liquids.
abstract: 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.
authors.affiliation: 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
authors.forename: Jan
authors.initials: J
authors.lastname: Leys
authors.forename: Michael
authors.initials: M
authors.lastname: Wübbenhorst
authors.forename: Chirukandath
authors.initials: C
authors.lastname: Preethy Menon
authors.forename: Ravindran
authors.initials: R
authors.lastname: Rajesh
authors.forename: Jan
authors.initials: J
authors.lastname: Thoen
authors.forename: Christ
authors.initials: C
authors.lastname: Glorieux
authors.forename: Peter
authors.initials: P
authors.lastname: Nockemann
authors.forename: Ben
authors.initials: B
authors.lastname: Thijs
authors.forename: Koen
authors.initials: K
authors.lastname: Binnemans
authors.forename: Stéphane
authors.initials: S
authors.lastname: Longuemart
mesh_terms: 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
chemical_list: D000473:Alkanes; D001881:Borates; D001888:Boric Acids; D007093:Imidazoles; D052578:Ionic Liquids; C098759:fluoroboric acid