Density, Viscosity, Speed of Sound, and Electrolytic Conductivity for the Ionic Liquid 1-Hexyl-3-methylimidazolium Bis(trifluoromethylsulfonyl)imide and Its Mixtures with Water

Published

November 15, 2007

Author(s)

Jason A. Widegren, Joe W. Magee

Abstract

Thermophysical properties were measured at ambient pressure for a high-purity sample of the ionic liquid 1-hexyl-3-methylimidazolium bis(trifluoromethylsulfonyl)imide, [C₆mim][Tf₂N], and its mixtures with water. Density was measured with two vibrating tube densimeters in the temperature range (258.15 to 373.15) K. Absolute viscosity was determined with a rotational coaxial cylinder measuring system over the temperature range (258.15 to 373.15) K, and kinematic viscosity was measured at (293.15 and 298.15) K with an Ubbelohde capillary viscometer. Speed of sound was measured in a pulse-echo cell over the temperature range (283.15 to 343.15) K. Electrolytic (ionic) conductivity was determined using the ac impedance bridge technique over the temperature range (288.15 to 323.15) K. For all of these measurements, special care was taken to control the concentration of water in the sample. The viscosity and electrolytic conductivity of ([C₆mim][Tf₂N] + H₂O) depend strongly on the concentration of water. By Karl Fischer titration the water mass fraction in the saturated ionic liquid was found to be 0.0111 plus or minus} 0.0004 at 298.15 K, and 0.0101 plus or minus} 0.0004 at 293.15 K.

Citation

Journal of Chemical and Engineering Data

Volume

52

Issue

6

Pub Type

Journals

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Citation

Widegren, J. and Magee, J. (2007), Density, Viscosity, Speed of Sound, and Electrolytic Conductivity for the Ionic Liquid 1-Hexyl-3-methylimidazolium Bis(trifluoromethylsulfonyl)imide and Its Mixtures with Water, Journal of Chemical and Engineering Data, [online], https://tsapps.nist.gov/publication/get_pdf.cfm?pub_id=50442 (Accessed December 2, 2024)