Thermophysical study of the binary mixtures of N , N -dimethylacetamide with 1-propanol and 1-butanol

Abstract

Several thermophysical properties such as densities, ρ, speeds of sound, u, refractive indices, nD, and kinematic viscosities,, have been measured for the binary mixtures of N,N-Dimethylacetamide with 1-propanol and 1-butanol over the entire range of composition, at the temperatures (283.15, 298.15 and 313.15) K and at atmospheric pressure p = 0.1 MPa. From these experimental data, excess molar volumes, V E , excess isentropic compressibilities, E S  , refractive index deviations, ΔnD, and viscosity deviations, Δη, were calculated. The calculated excess or deviation properties were correlated with the Redlich-Kister equation and the corresponding parameters were presented. The results obtained, were discussed in terms of structural effects and specific molecular interactions, and the influence of the alkanol chain length was also considered.

Viscosity, Gibbs Free Energy, and Refractive Indices for Binary Mixtures of o-Cresol + Poly(ethylene glycols) at T = 288.15–308.15 K and 96.5 kPa

“…The Δη values were listed in Table and shown in Figure , which shows that Δη is positive over the whole composition range, at all investigated temperatures. The large positive values of (Δη) indicate the presence strong specific interactions between the components of these mixtures. , This trend may be attributed to the more efficient packing of the two component mixtures in the solution than in their pure state. Similar trend was observed by Yang et al, , Yasmin and Gupta, Rao et al, Bajic et al, and Zhao et al .…”

“…The large positive values of (Δη) indicate the presence strong specific interactions between the components of these mixtures. 33,34 This trend may be attributed to the more efficient packing of the two component mixtures in the solution than in their pure state. Similar trend was observed by Yang et al, 35,36 Yasmin and Gupta, 37 Rao et al, 38 Bajic et al, 23 and Zhao et al 33 in the binary mixtures of p-cresol or m-cresol with ethylene glycol, m-cresol with PEG200, o-cresol or m-cresol with N, N-diethylactamide, 1,3-propandiol with PEG200 or PEG400, and 1,2-ethandiol with PEG300, respectively.…”

Hydrogen Bonding Interactions of m-Chlorotoluene with 1-Alkanol Analyzed by Thermodynamic, Fourier Transform Infrared Spectroscopy, Density Functional Theory, and Natural Bond Orbital

“…Prior to making the experimental measurements, all of the liquids were double distilled and partially degassed with a vacuum pump in an inert atmosphere. The purity of all of the solvents was adjudged by comparing their measured densities, speed of sound, heat capacities, and thermal expansion coefficient to those of corresponding pure liquids available in the literature. ,,,− The comparative data are listed in Table .…”

Study of the refractive index of gasoline+alcohol pseudo-binary mixtures

“…The pseudo-binary gasoline+alcohol mixtures were prepared at room temperature for various volume fractions, in order to cover the entire composition range. 3 ) 0.7919 0.8034 0.7909 [13] 0.7950 [14] 0.7851 0.7855 [15] 0.7853 [16] 0.8102 0.8101 [17] 0.8097 [13] Dynamic viscosity at 40 o C (mPa•s) 0.3673 0.9081 0.829 [18] 0.837 [19] 1.3236 1.3470 [16] 1.3500 [20] 1.7769 1.7696 [21] Refractive index at 20 o C 1.4520 1.3624 1.362 [22] 1.3766 1.3750 [23] 1.3752 [24] 1.3991 1.3950 [22] 1.3991 [25] The experimental uncertainty in volume fraction was estimated to be less than ±0.002. The mixtures were prepared in airtight narrow-mouth ground glass stoppered bottle, in order to minimize the evaporative losses.…”