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1.
Excess molar volumes
for binary mixtures of acetonitrile + dichloromethane, acetonitrile + trichloromethane, and acetonitrile + tetracloromethane at 25°C have been used to calculate partial molar volumes
, excess partial molar volumes
, and apparent molar volumes
of each component as a function of composition. The V
m
Evalues are negative over the entire composition range for the systems studied. The applicability of the Prigogine–Flory–Patterson theory was explored. The agreement between theoretical and experimental results is satisfactory for the systems with dichloromethane and tetrachloromethane. For the unsymmetrical behavior of the system with trichloromethane, however, the agreement is poor. 相似文献
2.
Amalendu Pal Harsh Kumar Ritu Maan Harish Kumar Sharma 《Journal of solution chemistry》2013,42(10):1988-2011
Densities and ultrasonic speeds have been measured over the whole composition range for binary liquid mixtures of dipropylene glycol dimethyl ether, CH3(OC3H6)2OCH3, with methyl acetate, ethyl acetate, and n-butyl acetate using an Anton Paar DSA 5000 M density and speed sound analyzer at T = (288.15, 293.15, 298.15, 303.15, and 308.15) K and atmospheric pressure in order to evaluate the behavior of these binaries. From these data excess the molar volume, $ V_{m}^{\text{E}} $ , and deviation in isentropic compressibility, ?κ S , have been calculated. These excess properties have been fitted with the Redlich–Kister type polynomial equation to get their coefficients and standard deviations which provide a base for discussing the forces operating in solutions. 相似文献
3.
J. V. Srinivasu K. Narendra Ch. Kavitha B. Subba Rao 《Journal of solution chemistry》2017,46(11):2066-2090
Densities, ρ, and speeds of sound, u, for the binary liquid mixtures of 1,4-butanediol (1,4-BD) + 2-alkoxyethanols {2-methoxyethanol (2-ME), or 2-propoxyethanol (2-PE)} over the whole composition range have been measured at T = (303.15, 308.15, 313.15 and 318.15) K, and at atmospheric pressure (p = 0.1 kPa). Experimental data for the densities and speeds of sound have been used to derive the quantities like excess molar volume, \( V_{\text{m}}^{\text{E}} \), excess isentropic compressibility, \( \kappa_{S}^{\text{E}} \), excess molar isentropic compressibility, \( K_{{S,{\text{m}}}}^{\text{E}} \), excess speed of sound, \( u^{\text{E}} \), and excess isobaric thermal expansion \( \alpha_{p}^{\text{E}} \). These excess parameters were correlated by Redlich–Kister polynomials. Excess partial molar volumes (\( \bar{V}_{\text{m,1}}^{\text{E}} \) and \( \bar{V}_{\text{m,2}}^{\text{E}} \)) and their limiting values at infinite dilution (\( \bar{V}_{\text{m,1}}^{{ 0 {\text{E}}}} \) and \( {\bar{\text{V}}}_{\text{m,2}}^{{ 0 {\text{E}}}} \)) have been calculated from the experimental density measurements and were analytically obtained using the Redlich–Kister polynomials. The results are discussed in terms of intermolecular interactions and their dependence on composition and temperature. 相似文献
4.
Emilio J. González Patricia F. Requejo Ángeles Domínguez Eugénia A. Macedo 《Journal of solution chemistry》2013,42(4):746-763
In this study, densities and speeds of sound were measured over the whole composition range, at T = (298.15, 303.15 and 308.15) K and p = 0.1 MPa, for the binary systems of ethanol, or 1-propanol, or 2-propanol and 1-butyl-3-methylpyridinium bis(trifluoromethylsulfonyl)imide, or 1-butyl-1-methylpyrrolidinium bis(trifluoromethylsulfonyl)imide. The density and speed of sound data were used to calculate the corresponding excess molar volumes and excess molar isentropic compressions, which were fitted with the Redlich–Kister equation. From the obtained results, a discussion was carried out in terms of interactions and structure factors in these binary mixtures. 相似文献
5.
Mehdi Hasan Apoorva P. Hiray Ujjan B. Kadam Dinesh F. Shirude Keshav J. Kurhe Arun B. Sawant 《Journal of solution chemistry》2011,40(3):415-429
Densities, viscosities and speeds of sound of binary mixtures of ethanol, propan-1-ol, butan-1-ol and pentane-1-ol with n-butyl acetate have been measured over the entire range of composition at temperatures of 298.15, 303.15, 308.15 and 313.15 K and atmospheric pressure. From the experimental densities, viscosities and speeds of sound, the excess molar volumes V E, deviations in viscosity ????, and deviations in isentropic compressibility ???? S have been calculated. The excess molar volumes and deviations in isentropic compressibility are positive for all the binary systems studied over the whole composition, while deviations in viscosities are negative for all of the binary mixtures. The excess molar volumes, deviations in viscosity, and deviations in isentropic compressibility have been fitted to a Redlich?CKister type polynomial equation. FTIR and 1H-NMR studies of these mixtures are also reported. 相似文献
6.
Alfonsina E. Andreatta Alberto Arce Eva Rodil Ana Soto 《Journal of solution chemistry》2010,39(3):371-383
Densities, viscosities and refractive indices have been measured at 298.15 K and atmospheric pressure for binary and ternary
mixtures of ethanol, ethyl acetate and 1-butyl-3-methyl-imidazolium bis(trifluoromethylsulfonyl) imide [C4mim][NTF2]. From these experimental properties, the corresponding excess properties have been calculated and adequately fitted with
the Redlich-Kister polynomial equation. The adjustable parameters and standard deviations between experimental and calculated
values are reported. Interest of this mixture is due to the possibility of using [C4mim][NTF2] as an entrainer in the extractive distillation of ethanol + ethyl acetate. These results are compared with previously determined
experimental data for mixtures of ethyl acetate and/or ethanol with the ionic liquid 1-octyl-3-methyl-imidazolium bis(trifluoromethylsulfonyl)imide,
[C8mim][NTF2]. 相似文献
7.
Excess molar volumes Vm^E and kinematic viscosities v have been measured as a function of composition for binary mixtures of propylene glycol monomethyl ether (1-methoxy-2-propanol), MeOCH2CH(OH)Me, propylene glycol monoethyl ether (1-ethoxy-2-propanol), EtOCH2CH(OH)Me, propylene glycol monopropyl ether (1-propoxy-2-propanol), PrOCH2CH(OH)Me, propylene glycol monobutyl ether (1-butoxy-2-propanol), BuOCH2CH(OH)Me, and propylene glycol tert-butyl ether (1-tert-butoxy-2-propanol), t-BuOCH2CH(OH)Me with 1-butanol, and 2-butanol, at 298.15 K and atmospheric pressure. The excess molar volumes are negative across the entire range of composition for all the systems with 1-butanol, and positive for the systems 2-butanol+ 1-methoxy-2-propanol, and +1-propoxy-2-propanol, negative for the systems 2-butanol+1-butoxy-2-propanol, and change sign for the systems 2-butanol+ 1-ethoxy-2-propanol, and + 1-tert-butoxy-2-propanol. From the experimental data, the deviation in dynamic viscosity η from ∑χiηi has been calculated. Both excess molar volumes and viscosity deviations have been correlated using a Redlich-Kister type polynomial equation by the method of least-squares for the estimation of the binary coefficients and the standard errors. 相似文献
8.
Densities (ρ), ultrasonic speeds (u), and excess molar volumes (VmEV_{\mathrm{m}}^{\mathrm{E}}) of binary mixtures of some aromatic ketones in acrylonitrile have been measured over the entire range of composition at
308.15 K. From these experimental results, parameters such as the isentropic compressibilities K
S
, interaction parameter χ
12, Flory parameters, A
i
coefficients, standard deviations σ(Y
E), and molar sound velocities R
m have been estimated. The excess functions were fitted to Redlich-Kister type polynomial equations. The experimental ultrasonic
speeds were analyzed in terms of Jacobson’s Free Length Theory (FLT), Schaaff’s Collision Factor Theory (CFT), Nomoto’s relation,
and Van Dael’s ideal mixture relation. The intermolecular Free Length L
f, and available volume V
a, have been calculated from the FLT, CFT, and thermoacoustic approaches for binary systems of acetophenone and propiophenone
in acrylonitrile at 308.15 K. 相似文献
9.
《Physics and Chemistry of Liquids》2012,50(2):215-220
Precise densities and viscosities at 298.15, 303.15, and 308.15?K for solutions of nicotine in water and in 0.02?mmol aqueous ethyl alcohol were measured for limiting apparent molal volume and B-coefficients calculations, respectively. These data are rationalized to illustrate hydrophilic and hydrophobic interactions between various functional groups present in these solutions. 相似文献
10.
Densities of sodium nitrobenzoate (o-, m-, p-) have been measured in dimethylformamide (DMF)–water mixtures at 298.15 K with an oscillating-tube densimeter. From these densities, apparent molar volumes of sodium nitrobenzoate in DMF–H2O-mixtures have been calculated and partial molar volumes at infinite dilution have been evaluated. Substituent and solvent effects on the transfer volumes of each isomer from water to DMF–H2O-mixed solvents have also been obtained. The results are explained in terms of solvent–solvent and solute–solvent interactions. 相似文献
11.
The densities (ρ), viscosities (η), ultrasonic speeds (u) and spectroscopic data of binary mixtures of benzene, toluene, m-xylene and mesitylene with β-pinene as a common component, over the whole composition range of mole fraction of β-pinene including those of pure components, have been measured at 303.15, 308.15 and 313.15 K, except for the spectroscopic study where the temperature was maintained at 298.15 K. The experimental results deviation in viscosity, deviation in ultrasonic velocity, isentropic compressibility and deviation in isentropic compressibility are discussed in terms of molecular interactions between unlike molecules. The variation of these excess parameters indicates the presence of weak interactions between β-pinene and benzene, toluene, m-xylene and mesitylene molecules. Moreover, the viscosity data are discussed in terms of interaction parameters. The theoretical ultrasonic speed was computed using the Nomoto model, ideal mixing relation, Jacobson’s free length theory and compared with the experimentally measured values. The experimental values are also discussed in terms of FTIR spectroscopy. 相似文献
12.
Hamid Reza Rafiee 《Journal of solution chemistry》2017,46(3):663-681
The densities of binary and ternary mixtures of benzyl alcohol + ethyl butyrate and/or diethyl malonate were measured at T = (293.15–313.15) K and p = 0.087 MPa. From these data, the excess molar volumes, partial molar volumes, excess partial molar volumes, partial molar volumes at infinite dilution, thermal expansion coefficients and their excess values were calculated. The Redlich–Kister equations were fitted to the excess molar volumes data. The results show that the excess molar volumes for all considered binary and ternary systems are negative and decrease with increasing temperature. The same behavior was observed for the excess thermal expansion coefficients. Data for excess volumes in ternary system were fitted with the Nagata–Tamura and Cibulka models for which the Cibulka equation showed better fitting. The intermolecular interactions between molecules in these mixtures are discussed and explained based on these experimental data. 相似文献
13.
Linfeng Rao Guoxin Tian Thandankorai G. Srinivasan PierLuigi Zanonato Plinio Di Bernardo 《Journal of solution chemistry》2010,39(12):1888-1897
Spectrophotometric titrations were performed to identify the Np(V)/acetate complex and determine the equilibrium constants
at various temperatures (T=283 to 343 K) and at the ionic strength 1.05 mol⋅kg−1. The enthalpies of complexation at the corresponding temperatures were determined by microcalorimetric titrations. Results
show that the complexation of Np(V) with acetate is weak but strengthens as the temperature increases. The complexation reaction
is endothermic and entropy driven. The enhancement of complexation at higher temperatures is primarily due to the increasingly
larger entropy gain when the solvent molecules are released from the highly-ordered solvation spheres of NpO2+\mathrm{NpO}_{2}^{+} and acetate to the bulk solvent where the degree of disorder is higher at higher temperatures. 相似文献
14.
15.
16.
SYAMALA Vardhana RAJA SEKHAR Damaramadugu SIVA KUMAR Kasibhatta VENKATESWARLU Ponneri 《中国化学》2007,25(1):32-43
Excess volumes (v^E), ultrasonic velocities (u), isentropic compressibility (△Ks) and viscosities (η) for the binary mixtures of dimethyl formamide (DMF) with 1,2-dichlorobenzene, 1,3-dichlorobenzene, 1,2,4-trichlorobenzene, o-chlorotoluene, m-chlorotoluene, p-chlorotoluene, o-nitrotoluene and m-nitrotoluene at 303.15 K were studied. Excess volume data exhibit an inversion in sign for the mixtures of dimethyl formamide with 1,2- and 1,3-dichlorobenzenes and the property is completely positive over the entire composition range for the mixtures of dimethyl formamide with 1,2,4-trichlorobenzene, o-nitrotoluene and m-nitrotoluene. On the other hand, the quantity is negative for the mixtures of dimethyl formamide with chlorotoluenes. Isentropic compressibility (Ks) has been computed for the same systems from precise sound velocity and density data. Further, deviation of isentropic com- pressibility (△Ks) from ideal behavior was also calculated. AKs values are negative over the entire volume fraction range in all the binary mixtures. The experimental sound velocity data were analysed in terms of Free Length Theory (FLT) and Collision Factor Theory (CFT). The viscosity data were analysed on the basis of corresponding state approach. The measured data were discussed on the basis of intermolecular interactions between unlike molecules. 相似文献
17.
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
18.
Excess molar volumes, $ V_{123}^{\text{E}} $ V 123 E , of 1, 3-dioxolane (1) + toluene (2) + o- or p-xylene (3) ternary mixtures have been determined dilatometrically over the entire composition range at 298.15 K. For thermodynamic consistency the experimental values were fitted to Redlich–Kister Equation. The $ V_{123}^{\text{E}} $ V 123 E values of 1, 3-dioxolane (1) + toluene (2) + o- or p-xylene (3) ternary mixtures have been found to be negative over the whole composition range. It has been observed that $ V_{123}^{\text{E}} $ V 123 E values calculated by graph theory are of the same sign and magnitude with respect to their experimental values. 相似文献
19.
G. Prasad K. Muralidhar Reddy R. Padamasuvarna T. Madhu Mohan T. Vijaya Krishna S. Govardhana Rao 《Journal of solution chemistry》2018,47(12):1980-2006
Density and speed of sound values of pure and binary mixtures of 1-butyl-3-methylimidazolium bis(trifluoromethanesulfonyl) amide ([Bmim][NTf2]) and 2-propoxyethanol (2-PR) were determined over the whole composition range as a function of temperature from 298.15 to 323.15 K) under atmospheric pressure. Heat capacity values of the pure compounds were also measured. The experimental values were used to calculate excess molar volume, excess isentropic compressibility, excess intermolecular free length and excess speed of sound values. The excess values were fitted with the Redlich–Kister polynomial equation to estimate the binary coefficients and standard deviation between the experimental and calculated values. The partial molar volumes at infinite dilutions were also calculated. The trends of variation of these properties were interpreted in light of the solute–solvent interactions occurring in the system. Further, the molecular interactions in the binary system were analyzed using experimental FT-IR spectra recorded at room temperature. 相似文献
20.
Ultrasonic speeds in, and isentropic compressibilities of, aqueous solutions of water + 2-butoxyethanol (2BE)+t-butanol have been determined at 298.15 K. The concentrations of t-butanol at which the ultrasonic speed becomes maximum and isentropic compressibility becomes minimum are found to decrease
with increases in the concentration of 2BE, x
2BE, in the cosolvent (aqueous 2BE). This behavior indicates that the aqueous ternary solutions are less structured than aqueous
t-butanol. In the presence of 2-butoxyethanol, enhancement in the hydrogen bonded structure of water due to hydrophobic hydration
between t-butanol and water molecules decreases as the concentration of x
2BE in the cosolvent increases. When x
2BE>0.2, the ternary solution behaves like a normal liquid. This behavior is also very well reflected in the concentration dependence
of the excess ultrasonic speed and excess isentropic compressibility. The optimum concentrations of t-butanol, ($x_{\mathrm{t}\mbox{-}\mathrm{B}}$x_{\mathrm{t}\mbox{-}\mathrm{B}})opt, at which extrema in ultrasonic speed, isentropic compressibility, excess ultrasonic speed and excess isentropic compressibility
are observed decrease with increase in x
2BE in the cosolvent. The results are explained as being due to a reduction in the strength of hydrophobic interactions responsible
for enhancement in the structure of water in aqueous t-butanol in the presence 2BE. Beyond (xt-Bx_{\mathrm{t}\mbox{-}\mathrm{B}})opt, the hydrogen bonded network of water collapses and water, 2-butoxyethanol and t-butanol molecules interact with each other as normal liquid molecules. 相似文献