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1.
The viscosity deviation (Δη), the excess molar volume (V
E) and the ultrasonic speed (u) have been investigated from viscosity (η) and density (ρ ) measurements of binary liquid mixtures of 1,2-dimethyoxyethane with methanol, ethanol, propan-1-ol, butan-1-ol,
pentan-1-ol, hexan-1-ol or octan-1-ol over the entire range of composition at 298.15 K. The excess volumes are negative over
the entire range of composition for all of the mixtures with the exception of hexan-1-ol and octan-1-ol. The excess isentropic
compressibilities (K
S
E) and viscosity deviations are negative for all of the mixtures. The magnitudes of the negative values of V
E decrease with the number of carbon atoms of the alkan-1-ol. The trend of increasing K
S
E values with the chain length of the alkanol is similar to that observed in the case of V
E. Graphs of V
E, Δ η, K
S
E, Δ u, L
f
E and Z
E against composition are presented as a basis for a qualitative discussion of the results. 相似文献
2.
Ufuk Sancar Vural Fatih Durmaz Ozcan Kocyigit Hasan Kocyigit V. Muradoglu Beril Akin 《Russian Journal of Physical Chemistry A, Focus on Chemistry》2008,82(13):2260-2268
Excess molar volumes (V
E), viscosities, refractive index, and Gibbs energies were evaluated for binary biodiesel + benzene and toluene mixtures at
298.15 and 303.15 K. The excess molar volumes V
E were determined from density, while the excess Gibbs free energy of activation G*E was calculated from viscosity deviation Δη. The excess molar volume (V
E), viscosity deviation (Δη), and excess Gibbs energy of activation (G*E) were fitted to the Redlich-Kister polynomial equation to derive binary coefficients and estimate the standard deviations
between the experimental data and calculation results. All mixtures showed positive V
E values obviously caused by increased physical interactions between biodiesel and the organic solvents. 相似文献
3.
The excess molar volume (V E), viscosity deviations (Δη) and Gibbs excess energy of activation for viscous flow (G∗E) have been investigated from density (ρ) and viscosity (η) measurements of eight binary mixtures of 1,3-dioxolane with methanol,
ethanol, 1-propanol, 2-propanol, 1-butanol, 2-butanol, t-butanol, and i-amyl alcohol over the entire range of mole fractions at 303.15 K. The viscosity data have been correlated with the Grunberg
and Nissan equation. Furthermore, excess isentropic compressibilities (KSE) have been calculated from ultrasonic speed measurements of these binary mixtures at 303.15 K. The deviations have been fitted
by a Redlich–Kister equation and the results are discussed in terms of molecular interactions and structural effects. The
excess properties are found to be either negative or positive depending on the molecular interactions and the nature of the
liquid mixtures. The systems studied exhibit very strong cross association through hydrogen bonding. 相似文献
4.
Abbas Ali Rostami Mohammad Javad Chaichi Mostafa Sharifi 《Monatshefte für Chemie / Chemical Monthly》2007,138(10):967-971
Summary. Density (ρ) and viscosity (η) values of the binary mixtures of DMP + 1-pentanol, 1-butanol, and 1-propanol over the entire range of mole fraction at 298.15 and 303.15 K were measured in atmospheric
pressure. The excess molar volume (V
E), viscosity deviations (Δη), and excess Gibbs energy of activation for viscous flow (G*E) were calculated from the experimental measurements. These results were fitted to Redlich–Kister polynomial equation to estimate the binary interaction parameters.
The viscosity data were correlated with equations of McAllister. The calculated functions have been used to explain the intermolecular interaction between the mixing components. 相似文献
5.
Excess molar volumes (V
m
E
) and viscosities (η) of the binary mixtures of 1,2-diethoxyethane with di-, tri- and tetrachloromethane have been measured
at 298-15 K and atmospheric pressure over the entire mole fraction range. The deviations in viscosities (δlnη) and excess
energies of activation (δG*E) for viscous flow have been calculated from the experimental data. The Prigogine-Flory-Patterson (PFP) model has been used
to calculateV
m
E
, and the results have been compared with experimental data. The Bloomfield and Dewan model has been used to calculate viscosity
coefficients and these have also been compared with experimental data for the three mixtures. The results have been discussed
in terms of dipole-dipole interactions between 1,2-diethoxyethane and chloroalkanes and their magnitudes decreasing with the
dipole character of the molecules. A short comparative study with results for mixtures with polyethers and chloroalkanes is
also described. 相似文献
6.
S. Nithiyanantham L. Palaniappan 《Russian Journal of Physical Chemistry A, Focus on Chemistry》2012,86(2):219-222
Ultrasonic velocity (U), density (ρ), and viscosity (η) measurements have been carried out in three ternary mixtures of fructose with amylase in
aqueous medium at 298.15 K. The experimental data have been used to calculate some derived parameters such as acoustical impedance
(Z), relative association (R
a
), Rao’s constant (R
R), Wada’s constant (W), relaxation time (τ), relaxation amplitude (α/f
2), relaxation strength (r), and some excess thermodynamical properties like excess adiabatic compressibility (β
E
), excess free length (L
f
E
) excess free volume (V
f
E
), excess internal pressure (π
i
E
), and excess acoustical impedance (Z
E
). The above parameters have been evaluated and discussed in light of molecular interactions in the mixture. 相似文献
7.
Maria M. Palaiologou George K. Arianas Nikos G. Tsierkezos 《Journal of solution chemistry》2006,35(11):1551-1565
Densities (ρ), speeds of sound (u), and isentropic compressibilities (k
S) of binary mixtures of dimethyl sulfoxide (DMSO) with water, methanol, ethanol, 1-propanol, 2-propanol, acetone and cyclohexanone have been measured over the entire composition range at 293.15 and 313.15 K. The excess molar volumes (V
E), the deviations in speed of sound (u
E) and the deviations in isentropic compressibility (k
S
E) have been determined. The V
E, u
E and k
S
E values were fitted by the Redlich-Kister polynomial equation and the A
k
coefficients as well as the standard deviations (d) between the calculated and experimental values have been derived. The results obtained are discussed from the viewpoint of the existence of interactions between the components of the binary mixtures. 相似文献
8.
Densities (ρ), viscosities (η) and speeds of sound (u) of the ternary mixture (1-heptanol + tetrachloroethylene + methylcyclohexane) and the corresponding binary mixtures (1-heptanol + tetrachloroethylene),
(1-heptanol + methylcyclohexane) and (tetrachloroethylene + methylcyclohexane) at 298.15 K were measured over the whole composition
range. The data obtained are used to calculate the excess molar volumes (V
E), excess isobaric thermal expansivities (α
E), viscosity deviations (Δη), excess Gibbs energies of activation of viscous flow (ΔG
*E) and excess isentropic compressibilities (κ
S
E) of the binary and ternary mixtures. The data from the binary systems were fitted by the Redlich–Kister equation whereas
the best correlation method for the ternary system was found using the Nagata equation. Viscosities, speeds of sound and isentropic
compressibilities of the binary and ternary mixtures have been correlated by means of several empirical and semi-empirical
equations. The best correlation method for viscosities of binary systems is found using the Iulan et al. equation and for
the ternary system using the Heric and McAllister equations. The best correlation method for the speeds of sound and isentropic
compressibilities of the binary system (1-heptanol + methylcyclohexane) is found using IMR (Van Deal ideal mixing relation)
and for the binary system (tetrachloroethylene + methylcyclohexane) it is found using the NR (Nomoto relation) and for the
binary system (1-heptanol + tetrachloroethylene) and the ternary system (1-heptanol + trichloroethylene + methylcyclohexane)
it is obtained from the FLT (Jacobson free length theory). 相似文献
9.
K. P. Singh Harshit Agarwal Vivek Kumar Shukla Isht Vibhu Manisha Gupta J. P. Shuka 《Journal of solution chemistry》2010,39(11):1749-1762
Measurements of the ultrasonic velocity (u), density (ρ) and refractive index (n) for binary mixtures of polyethylene glycol 250 dimethyl ether with 1-propanol and 1-butanol have been made at three temperatures
(T=293, 303 and 31 K) over the entire composition range in order to investigate the nature of intermolecular interactions between
the components of these liquid mixtures. Various excess thermodynamic properties such as the excess ultrasonic velocity (Δu), deviation in isentropic compressibility (Δk
S
), excess intermolecular free length (LfE)(L_{\mathrm{f}}^{\mathrm{E}}), excess acoustic impedance (Z
E), excess pseudo-Grüneisen parameter (Γ
E), and molar refraction deviation (ΔR
m) were calculated using experimental values of the ultrasonic velocity, density and refractive index and were then represented
with the Redlich-Kister polynomial equation. The observed excess deviation parameter values were explained on the basis of
the strength of intermolecular interactions between the components of the mixtures. Estimations of the refractive index and
ultrasonic velocity have also been made using various empirical relations and are discussed in terms of the average percentage
deviations (APD). 相似文献
10.
T. E. Vittal Prasad A. Phanibhushan D. H. L. Prasad 《Journal of solution chemistry》2005,34(11):1263-1272
Densities and viscosities of the binary mixtures of m-cresol with 1,2-dichloroethane, 1,1,1-trichloroethane, 1,1,2,2-tetrachloroethane and tetrachloroethylene were measured at
303.15, 313.15 and 323.15 K. The measured results are used to compute the excess volumes (VE), deviations in viscosity (Δη) and excess Gibbs energy for activation of flow (ΔGE). The excess volumes, deviations in viscosity, and Gibbs energies for activation of flow are fitted to a polynomial-type
equation suggested by Scharlin et al. [J. Chem. Thermodyn. 34, 927 (2002)] and are discussed in general terms. 相似文献
11.
M. N. Roy R. Chanda G. Ghosh 《Russian Journal of Physical Chemistry A, Focus on Chemistry》2009,83(8):1331-1341
The densities (ρ) and viscosities (η) for the ternary liquid mixtures of water + N,N-dimethylformamide + monoalkanols, have
been measured as a function of the composition at 298.15, 308.15, and 318.15 K. From the experimental measurements excess
molar volumes (V
E), Viscosity deviation (Δη), and synergy index (I
s) have been evaluated. The speeds of sound have been also measured and excess isentropic compressibilities (K
sE) are calculated al 298.15 K. The results are discussed and interpreted in terms of molecular package and specific interaction
predominated by hydrogen bonding, been investigated. 相似文献
12.
Manapragada V. Rathnam Sharad Mankumare Kirti Jain M. S. S. Kumar 《Journal of solution chemistry》2012,41(3):475-490
Densities, viscosities and speeds of sound of binary mixtures of ethyl benzoate with cyclohexane, n-hexane, heptane and octane have been measured over the entire range of composition at (303.15, 308.15 and 313.15) K and at
atmospheric pressure. From these experimental values, excess molar volume (V
E), deviation in viscosity (Δη) and deviation in isentropic compressibility (ΔK
s) have been calculated. The viscosities of binary mixtures were calculated theoretically from the pure component data by using
various empirical and semi-empirical relations and the results compared with the experimental findings. 相似文献
13.
Excess molar volumes (V
m
E
), viscosity deviations (Δlnη) and excess energies of activation for viscous flow (ΔG*E) are reported for non-electrolyte mixtures of 1,2-dimethoxyethane (monoglyme) and dichloromethane, trichloromethane, and
tetrachloromethane at 298·15 K and at atmospheric pressure over the whole mole fraction range. The Prigogine-Flory-Patterson
(PFP) model has been used to calculateV
m
E
, and the results are compared with experimental data. The Bloomfield and Dewan model has been used to calculate viscosity
coefficients, which are compared with experimental data for three mixtures. These results have been analysed in terms of dipole-dipole
interactions between 1,2-dimethoxyethane and chloroalkanes. The magnitude of the strength of interaction decreases with the
dipole character of the molecule. 相似文献
14.
G. Sankara Reddy A. Subba Reddy M. Venkata Subbaiah A. Krishnaiah 《Journal of solution chemistry》2010,39(3):399-408
The data on excess volume (V
E), density (ρ), viscosity (η) and speeds of sound (u) for the binary mixtures of tert-butylamine (TBA) + methyl acetate (MA), + ethyl acetate (EA), + butyl acetate (BA) and + isoamyl acetate (IAA) at 303.15 K
were measured experimentally over the entire range of composition. Speeds of sound were evaluated using Jacobson’s free length
theory (FLT) and Schaaffs’ collision factor theory (CFT). The viscosity data were analyzed on the basis of the corresponding
states approach and the Grunberg and Nissan treatment. The experimental results for excess volume, deviation in isentropic
compressibility and deviation in viscosity were discussed in terms of molecular interactions between unlike molecules. A Redlich-Kister
type equation was used to fit the experimental data on excess volume, deviation in compressibility and deviation in viscosity. 相似文献
15.
《Physics and Chemistry of Liquids》2012,50(6):610-626
Densities (ρ), viscosities (η), and speeds of sound, (u) of the binary mixtures of 2-propanol with n-alkanes (n-hexane, n-octane, and n-decane) were measured over the entire composition range at 298.15 and 308.15 K and at atmospheric pressure. Using the experimental values of density, viscosity and speed of sound, the excess molar volumes (V E), viscosity deviations (Δη), deviations in speed of sound (Δu), isentropic compressibility (κ s), deviations in isentropic compressibility (Δκ s), and excess Gibbs energies of activation of viscous flow (ΔG* E) were calculated. These results were fitted to the Redlich–Kister type polynomial equation. The variations of these excess parameters with composition were discussed from the viewpoint of intermolecular interactions in these mixtures. The excess properties are found to be either positive or negative depending on the molecular interactions and the nature of liquid mixtures. 相似文献
16.
The excess molar volumes, V
mE, viscosity deviations, Δη, and excess Gibbs energies of activation, ΔG
*E, of viscous flow have been investigated from density and viscosity measurements for two ternary mixtures, 1-butanol + triethylamine
+ cyclohexane and 1-pentanol + triethylamine + cyclohexane, and corresponding binaries at 303.15 K and atmospheric pressure
over the entire range of composition. The empirical equations due to Redlich-Kister, Kohler, Rastogi et al., Jacob-Fitzner,
Tsao-Smith, Lark et al., Heric-Brewer, and Singh et al. have been employed to correlate V
mE, Δη and ΔG
*E of the ternary mixtures with their corresponding binary parameters. The results are discussed in terms of the molecular interactions
between the components of the mixture. Further, the Extended Real Associated Solution, ERAS, model has been applied to V
mE for the present binary and ternary mixtures, and the results are compared with experimental data. 相似文献
17.
《Physics and Chemistry of Liquids》2012,50(2):331-341
Densities and ultrasonic velocities were measured for binary liquid mixtures of ethyl acetoacetate (EAA) with chloroform (CHCl3) and dimethylsulphoxide (DMSO) over the entire composition range. These experimental values were used to calculate the adiabatic compressibility (βs), intermolecular free length (Lf), excess molar volume (VE), excess adiabatic compressibility (βsE) and excess intermolecular free length (LfE) for the liquid mixtures under consideration. In all the excess parameters, a positive deviation was observed in CHCl3–EAA binary mixture, whereas a slight negative deviation was found for EAA–DMSO binary liquid mixture. These deviations were explained in terms of molecular interactions between like and unlike molecules and further affirmed by UV–Vis spectroscopic measurements in terms of polar and non-polar environment in the close proximity of solvatochromic dye. Fourier transform infrared spectroscopy (FT-IR) and proton-nuclear magnetic resonance (H1 NMR) measurements have also been done to explain the molecular interaction in the binary liquid mixtures. 相似文献
18.
《Physics and Chemistry of Liquids》2012,50(4):459-473
Abstract The ultrasonic velocity, u, viscosity, η, and density, ρ of dimethylsulphoxide (DMSO), 1-butanol, 1-hexanol, 1-octanol, and of their binary mixtures, where DMSO is common component, have been measured at 303.15 K. From the experimental data, excess isentropic compressibility, K E s, excess intermolecular free length, LE f, excess velocity, u E, excess acoustic impedance, Z E, excess viscosity, ηE, excess free energy of activation of viscous flow, G?E, and excess rheochore, [R E] have been calculated. The behaviours of excess functions with composition of the mixtures suggest that the structure-breaking effect dominates over the interaction effect between the component molecules. Furthermore, the experimental values of u and η were fitted by empirical equations stating their dependence on composition of the mixtures. The experimental values of u have been compared with those calculated by using Nomoto and Van Dael relations. 相似文献
19.
Excess Molar Volume and Viscosity of Isobutyric Acid + Water Binary Mixtures Near and Far Away from the Critical Temperature 总被引:1,自引:0,他引:1
The excess molar volume VE, shear viscosity deviation Δη and excess Gibbs energy of activation ΔG∗E of viscous flow have been investigated by using density (ρ) and shear viscosity (η) measurements for isobutyric acid + water (IBA+W) mixtures over the entire range of mole fractions at five different temperatures,
both near and close to the critical temperature (2.055K ≤ (T−Tc)≤ 13.055K). The results were also fitted with the Redlich–Kister equation. This system exhibited very large negative values
of VE and very large positive values of Δη due to increased hydrogen bonding interactions and correlation length between unlike molecules in the critical region and
to very large differences between the molar volumes of the pure components at low temperatures. The activation parameters
ΔH∗ and ΔS∗ have been also calculated and show that the critical region has an important effect on the volumetric properties. 相似文献
20.
《Physics and Chemistry of Liquids》2012,50(2):262-271
The density (ρ), viscosity (η) and ultrasonic velocity (u) of three mixtures consisting of 2- pyrrolidone with 1,3-propanediol (PD) and water and also of PD and water have been measured as a function of mole fraction at 308.15 K. The experimentally collected data has been used to calculate the excess molar volume (VE), deviation in viscosity (Δη), deviation in ultrasonic velocity (Δu), isentropic compressibility (κs), deviation in isentropic compressibility (Δκs) and excess Gibbs free energy of activation (ΔG*E). The Redlich–Kister polynomial equation has been used to fit the derived parameters. The variation in excessive thermodynamic properties as a consequence of possible molecular interactions is discussed. 相似文献