Temperature-Dependent Density and Viscosity of the Ionic Liquids 1-Alkyl-3-methylimidazolium Iodides: Experiment and Molecular Dynamics Simulation

Abstract

The density and viscosity of synthesized 1-alkyl-3-methylimidazolium iodide ([C n mim]I, n ) 4, 6, 8) were measured in the wide range of temperature of (298 to 393) K. Using a vacuum line, measurements of the viscosity were made under a water-vapor free atmosphere. The viscosity decreases sharply with temperature and increases as the alkyl chain length increases. The molecular dynamics simulation was performed for the densities of these ionic liquids to remedy the lack of literature experimental data. The results are quite in agreement with the experiments, with a maximum deviation of 3.00 % due to [C 8 mim]I at 358 K. The viscosities fit best in the modified Arrhenius, Vogel-Fulcher-Tammann (VFT), and Litovitz equations. The viscosities also fit in the simple linear equation we proposed recently with accuracies comparable with Litovitz and VFT.

Potassium Carbonate as a Salt for Deep Eutectic Solvents

“…By having such data at the design stage, the considered DES system can be synthesized to achieve the least value for viscosity. In addition, by knowing the temperature effect on viscosity, energy requirements for processing these fluids can be reduced [18] In general, ILs have exponentially decaying viscosity-temperature profiles [19]. Similar behavior has also been reported for some DES systems [5].…”

Dissolution of cellulose in 1-allyl-3-methylimizodalium carboxylates at room temperature: A structure–property relationship study

“…At the same time, viscosities of the ILs were found to increase in the order: [Amim][HCOO] < [Amim][CH 3 COO] < [Amim][CH 3 CH 2 COO] < [Amim][CH 3 CH 2 CH 2 COO]. This suggests that viscosities of the ILs increase with increasing alkyl chain length in carboxylate anions because of the increased van der Waals interactions(Ghatee, Zare, Moosavi, & Zolghadr, 2010;Gómez, González, Domínguez, Tojo, & Tojo, 2006;Greaves, Weerawardena, Fong, Krodkiewska, & Drummond, 2006). Moreover, it was found that viscosity significantly increased owing to the substitution of H in the anions by a hydroxyl group.…”

Density, transport properties and electrochemical potential windows for the 2-hydroxy-N,N,N-trimethylethanaminium chlorides based ionic liquids at several temperatures

“…In addition, by knowing the temperature effect on viscosity, energy requirements for processing these fluids can be reduced [25]. In general, ILs have exponentially decaying viscosity-temperature profiles [26]. Similar behavior has also been reported for some DES systems [22].…”