Dynamic Viscosity Study of Binary Mixtures Triethylamine + Water at Temperatures Ranging from (283.15 to 291.35) K

Abstract

Densities, ρ, and dynamic viscosities, η, of triethylamine + water (TEA−W) binary mixtures have been determined experimentally in the single phase region and over the whole composition range at T = (283.15 to 291.35) K. The experimental measurements of these properties were carried out at atmospheric pressure. Results have been fitted to obtain the adjustable parameters and standard deviations between the measured and fitted values, respectively. The viscosity data have been also correlated with the equations of Grunberg−Nissan, Hind et al., Katti−Chaudhri, Heric−Brewer, McAllister, and Auslander.

TGA–FTIR study of the vapors released by triethylamine–acetic acid mixtures

“…This was also theoretically predicted by ab initio calculations for the trimethylamine-formic acid and propylamine-propionic acid systems [22,30]. The ionic nature of the complexes was confirmed by both mid and near infrared spectroscopy [20,21,[24][25], FT-Raman [17], 1 H-NMR and 13 C-NMR [15,31], dielectric spectroscopy, conductivity measurements [18,23], melting and boiling point measurements, ultrasound absorption and relaxation spectroscopy [12,24,[32][33], and combinations of different measurement techniques including density, optical refractive index, and shear viscosity [23].…”

Streaming Potential Measurements on the Binary Mixture Triethylamine-Water Near the Demixing Phase Transition

“…). Temperature dependence of viscosity of the binary mixture for the critical composition in the single phase has been reported by [21,39] as shown in Figure 11. It is shown that when the temperature approaches the critical temperature (T ), the critical fluctuations cause a further increase of the viscosity for the critical composition (32.1%).…”

“…The critical temperature for the 32.1% composition is visually identified to be 20.2 ∘ C in our measurements when the opalescence is well developed in the glass container that can be seen through. The critical temperature is shifted to a higher value compared to the known critical temperature = 18.4 ∘ C [21] or 18.242 ∘ C < < 18.253 ∘ C [23]. The reasons for this discrepancy are likely the impurities (e.g., CO 2 , H 2 O) of the mixtures, the dissolution of mineral substances of the sample, and the ability of the strongly basic triethylamine to attack glass as mentioned in [19].…”

“…The motivation for this work is that large density fluctuations developing near the critical point of the binary mixtures affect physical parameters directly related to streaming potential coefficient (the electrokinetic coupling coefficient in general) such as viscosity, electrical conductivity, and dielectric constant [21][22][23]. From those observations, we investigate how streaming potential coefficient and the zeta potential, one of the most important parameters in electrokinetics, behave near the demixing phase transition.…”

“…This mixture is a typical partially miscible system that has a lower critical solution temperature near room temperature at atmospheric pressure. The critical composition of the mixture is 32.1% of TEA mass fraction and critical temperature ranges from 18.24 ∘ C to 18.40 ∘ C [21,23]. The experimental measurements are carried out in the single phase solution.…”