Viscosity of ionic liquids

H. Schmidt1, M. Engelmann1, M. Talibov2, J. Safarov1,2, A. Shahverdiyev2 and E. Hassel1

1University of Rostock, Germany
2Azerbaijan Technical University, Azerbaijan

Keywords: Stabinger viscosimeter, ionic liquids, density, kinematics viscosity
property: viscosity
material: ionic liquids

Ionic liquids (IL’s) have been suggested as potentially “green” replacements for convensional organic solvents since they are nonvolatile (negligible vapor pressure), nonflammable, thermal stable, and recyclable. IL’s have been used for electrochemical applications (solar cells) and con-siderable improved the performance in the device, in chemical processing and fine chemicals as “solvents” for organic, organometallic syntheses, homogeneous and heterogeneous catalysis; in electrochemistry and electrolytes; in polymer and biopolymer processing; in metal processing; in engineering and functional fluids and separation processes. They are claimed to be useful as heat transfer fluids in solar heating and absorption refrigerating systems. Their applications are successful also in fuel, solar cells, as lubricants and biological reactions media. Beside these, IL’s also apply for the stationary phase for chromatography, as matrices for mass spectrometry, sup-ports for the immobilization of enzymes, in separation technologies, as liquid crystals, templates for the synthesis of mesoporous, nano-materials and ordered films, materials for embalming and tissue preservation. The dynamic viscosity of 1-ethyl-3-methylimidazolium octylsulfate, 1-ethyl-3-methylimidazolium bis(trifluoromethylsulfonyl)imide, 1-ethyl-3-methylimidazolium dicyanamide, 1- ethyl-3-methylimidazolium tosylate, 1-butyl-3-methylimidazolium tosylate, 1-butyl-3-methylpyridinium tetrafluoroborate, 1-butyl-4-methylpyridinium tetrafluoroborate, 1-butyl-3-methylimidazolium dicyanamide, 1-butyl-3-methylimidazolium tetrafluoroborate, 1-hexyl-3-methylimidazolium tetrafluoroborate are measured using the Stabinger measuring SVM3000 viscosimeter at T=(278.15 to 363.15) K. The kinematics viscosity of investigated IL’s were calculated using the high accuracy density values in the same temperatures, measured using the Anton-Paar DMA 5000 densimeter with an uncertainty of ±0.01 K. Because, the density results determined using the Stabinger measuring SVM3000 viscosimeter have not high accuracy like as density values obtained from DMA 5000 densimeter. The overall precision in experimental density measure-ments at ambient pressure was found to be better than ±2•10-5 g•cm−3. Obtained viscosity values are fitted using the various empiric equations. The possibly literature analysis of viscosity of investigated IL’s were carried out.

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