Journal
JOURNAL OF MOLECULAR LIQUIDS
Volume 153, Issue 1, Pages 46-51Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.molliq.2009.05.001
Keywords
Room-temperature ionic liquids; Imidazolium salts; Dielectric spectroscopy; Transport properties; Excess properties
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Data for the densities, conductivities, viscosities and dielectric properties of binary mixtures of the tetrafluoroborate and the dicyanamide salts of 1-N-ethyl-3-N-methylimidazolium have been measured at 25 degrees C. The mixtures exhibit practically ideal (linear) mixing behaviour with respect to viscosity, molar volume, and the effective dipole moment of the observed relaxation associated with cation reorientation, indicating a smooth change in the structure of the mixtures. On the other hand, the electrical conductivity and dielectric relaxation time deviate considerably from ideal mixing behaviour, indicating enhanced translational and rotational dynamics in the mixtures. (C) 2009 Elsevier B.V. All rights reserved.
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