On the viscosity of two 1-butyl-1-methylpyrrolidinium ionic liquids: Effect of the temperature and pressure

Abstract

Please cite this article as: F.M. Gaciño, M.J.P. Comuñas, T. Regueira, J.J. Segovia, J. Fernández, On the viscosity of two 1-butyl-1-methylpyrrolidinium ionic liquids: effect of the temperature and pressure, J. Chem. Thermodynamics (2015), doi: http://dx.doi.org/10. 1016/j.jct.2015.03.002 This is a PDF file of an unedited manuscript that has been accepted for publication. As a service to our customers we are providing this early version of the manuscript. The manuscript will undergo copyediting, typesetting, and review of the resulting proof before it is published in its final form. Please note that during the production process errors may be discovered which could affect the content, and all legal disclaimers that apply to the journal pertain.On the viscosity of two 1-butyl-1-methylpyrrolidinium ionic liquids: effect of the temperature and pressure

Contributing to accurate high pressure viscosity measurements: Vibrating wire viscometer and falling body viscometer techniques

“…These values concur with the values given by other authors [23]. With regard to n-heptane, the correlation proposed by Assael et al [22] was used to compare our experimental viscosities in order to check the technique.…”

Communication: Inflection in the pressure dependent conductivity of the protic ionic liquid C8HIM NTf2

“…Whether this feature is reflected in the pressure dependent viscosity for C 8 HIM NTf 2 is not clear so far. However, a similar behavior can be seen in η(p) for many molecular liquids 15,16 and some ionic liquids, 17 even though the concave progression at low pressures is not necessarily incorporated in the models used in these reports. This inflection might arise from a non-linearity of the volume with a change of pressure.…”

“…For the first time, we could observe a transition between slower than exponential and Vogel-Fulcher-like pressure dependence of the dc-conductivity, similar to the behavior reported in pressure dependent viscosity and relaxation times in other materials. [15][16][17] The measured data were fitted with the hybrid model suggested by Bair for η(p) (Eq. (4)) over the whole pressure range.…”

High Pressure Rheological Behavior of 1-Ethyl-3-methylimidazolium n-Hexylsulfate and Trihexyl(tetradecyl)phosphonium Tris(pentafluoroethyl)trifluorophosphate

“…For the viscosity pressure coefficient, α, needed in equation (19), we have chosen, as in previous articles 30,62,65,67,69 , the definition of film given by equation ( The obtained values of the temperature-viscosity coefficient are presented in Figure 10.…”

“…There are several works that study the viscous behavior at constant shear rate with falling body viscometers [30][31][32] , rotational viscometers [33][34][35][36][37] , rolling ball viscometers 38 , capillary viscometers 39 and vibrating wire viscometers 40 , among others. Concerning rheological studies at not constant shear rates, there are only some publications at atmospheric pressure.…”