Original scientific paper

Permittivities of 1-Alkyl-3-methylimidazolium Tetrafluoroborates and Hexafluorophosphates

Marek Kosmulski ; Faculty of Electrical Engineering and Computer Science, Lublin University of Technology, Lublin, Poland
Krystyna Marczewska-Boczkowska ; Faculty of Electrical Engineering and Computer Science, Lublin University of Technology, Lublin, Poland
Pawel Zukowski ; Faculty of Electrical Engineering and Computer Science, Lublin University of Technology, Lublin, Poland
Jan Subocz ; Faculty of Electrical Engineering, Szczecin University of Technology, Szczecin, Poland
Czeslaw Saneluta ; Faculty of Electrical Engineering and Computer Science, Lublin University of Technology, Lublin, Poland

Abstract

Permittivities of 1-alkyl-3-methylimidazolium tetrafluoroborates, hexafluorophosphates, and
tetrafluoroborate-chloride mixtures (alkyl = butyl, hexyl, octyl or decyl) were determined from
the capacitance of a specially designed capacitor, which was measured as the function of frequency
over the range from 0.001 Hz to 5 MHz. The measurement setup was tested against
molecular liquids. Water and methanol gave relatively stable results, which comply with the
permittivities known from the literature over a frequency range from 30 kHz to 3 MHz. The
apparent permittivity measured at lower frequencies was highly overestimated. With low-temperature
ionic liquids, the plateau in the apparent permittivity as the function of frequency was
narrower, and it was observed between 1 and 3 MHz. Yet, the apparent permittivities in the plateau
region are still overestimated, at least for 1-butyl-3-methylimidazolium salts.

Keywords

permittivity; room temperature; ionic liquids

Hrčak ID:

18670

URI

https://hrcak.srce.hr/18670

Publication date:

30.11.2007.

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