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1.
Densities, viscosities and ultrasonic speeds of sound for binary mixtures of 1,2-dimethoxyethane (DME) with benzene, toluene,
chlorobenzene, benzyl chloride, benzaldehyde, nitrobenzene, and aniline are reported over the entire composition range at
ambient pressure and temperature (i.e., T=298.15 K and p=1.01×105 Pa). These experimental data were utilized to derive the excess molar volumes (VmEV_{\mathrm{m}}^{\mathrm{E}}), excess viscosities (η
E), and various acoustic parameters including the deviation in isentropic compressibility (Δκ
S
), internal pressure (π
I), and excess enthalpy (H
E). From the excess molar volumes (VmEV_{\mathrm{m}}^{\mathrm{E}}), the excess partial molar volumes ([`(V)]m,1E\overline{V}_{\mathrm{m},1}^{\mathrm{E}} and [`(V)]m,2E\overline{V}_{\mathrm{m},2}^{\mathrm{E}}) and excess partial molar volumes at infinite dilution ([`(V)]m,10,E\overline{V}_{\mathrm{m},1}^{0,\mathrm{E}} and [`(V)]m,20,E\overline{V}_{\mathrm{m},2}^{0,\mathrm{E}}) were derived and discussed for each liquid component in the mixtures. The excess/deviation properties were found to be either
negative or positive, depending on the molecular interactions and the nature of the liquid mixtures. 相似文献
2.
Sunil K. Jangra Neeti Saini J. S. Yadav Dimple Sharma V. K. Sharma 《Journal of solution chemistry》2011,40(6):1055-1066
Excess molar volumes, V123EV_{123}^{\mathrm{E}}, of 1,3-dioxolane or 1,4-dioxane (1) + aniline (2) + benzene or toluene (3) ternary mixtures have been determined over the
entire mole fraction range at 308.15 K. V123EV_{123}^{\mathrm{E}} data have been fitted to the Redlich-Kister equation to evaluate ternary adjustable parameters and standard deviations. The
observed V123EV_{123}^{\mathrm{E}} data have been analyzed in terms of (i) Graph theory, (ii) Prigogine-Flory-Patterson theory, and (iii) Sanchez and Lacombe
theory. It has been observed that V123EV_{123}^{\mathrm{E}} values predicted by Graph theory compare well with the corresponding experimental values. 相似文献
3.
Densities, viscosities, and refractive indices of three amino acids (glycine, L-alanine, and L-valine) in aqueous solutions
of an ionic liquid, 1-propyl-3-methylimidazolium bromide, have been measured at 298.15 K. These data have been used to calculate
apparent molar volumes (V
φ
), viscosity B-coefficients, and molar refractions of these mixtures. The standard partial molar volumes (Vf0V_{\phi}^{0}) and standard partial molar volumes of transfer (DtrVf0\Delta_{\mathrm{tr}}V_{\phi}^{0}) have been determined for these amino acid solutions from these density data. The resulting values of Vf0V_{\phi}^{0} and DtrVf0\Delta_{\mathrm{tr}}V_{\phi}^{0} for transfer of amino acids from water to aqueous ionic liquid solutions have been interpreted in terms of solute + solvent
interactions. These data also indicate that hydrophobic interactions predominate in L-alanine and L-valine solutions. Linear
correlations were found for both Vf0V_{\phi}^{0} and the viscosity B-coefficient with the number of carbon atoms in the alkyl chain of the amino acids, and have been used to estimate the contribution
of the charged end groups (NH3+\mathrm{NH}_{3}^{+}, COO−), the CH2 group, and other alkyl chains of the amino acids. The viscosity and molar refractivity results have been used to confirm
the conclusions obtained from volumetric properties. 相似文献
4.
Ramzi Zarrougui Mahmoud Dhahbi Daniel Lemordant 《Journal of solution chemistry》2010,39(10):1531-1548
The densities of binary mixtures of ethylammonium nitrate (EAN) ionic liquid (IL) and γ-butyrolactone (BL) have been measured over the entire range of concentrations at 293.15, 298.15, 303.15, 308.15, 313.15 and
318.15 K and under ambient pressure. Experimental densities were used to calculate excess molar volumes VmEV_{m}^{\mathrm{E}}, isobaric and excess isobaric expansion coefficients α and α
E. The excess molar volumes have both negative and positive values, while the excess isobaric expansion coefficients are negative
over the entire composition range. The VmEV_{m}^{\mathrm{E}} values have been fitted to the Redlich-Kister polynomial equation, and other volumetric properties such as the partial molar
volumes V
mi
, the excess partial molar volume VEmiV^{\mathrm{E}}_{mi} and the partial molar volumes at infinite dilution V¥miV^{\infty}_{mi} were calculated. The results have been interpreted in terms of dipole-dipole interactions, hydrogen bonds formation and structural
factors of these mixtures. The FT-Raman spectroscopy study of the intensity variations of some characteristic bands such as
the C=O stretching band at 1763 cm−1, C–O symmetric stretching band at 932 cm−1 and C–C stretching band at 872 cm−1 of BL has been undertaken. The solvation phenomenon is evidenced by the modifications of these band intensities due to the
presence of the IL ions. Moreover, the Raman spectroscopy corroborates the volumetric study. The average number of BL molecules
in the primary solvation shell of the ethylammonium cation lies between 3 and 4 depending on the temperature. 相似文献
5.
Solution densities over the temperature range 288.15 to 328.15 K have been measured for aqueous solutions of N-acetylarginamide monotrifluoroacetate and sodium trifluoroacetate, from which the partial molar volumes at infinite dilution,
V2oV_{2}^{\mathrm{o}}, were determined. The partial molar heat capacities at infinite dilution, Cp,2oC_{p,2}^{\mathrm{o}}, were also determined for these solutes over the same temperature range. These V2oV_{2}^{\mathrm{o}} and Cp,2oC_{p,2}^{\mathrm{o}} results, along with relevant data taken from the literature, have been used to calculate the contributions of the protonated
arginyl side-chain to the thermodynamic properties. These new side-chain values were critically compared with those obtained
previously using alternative side-chain model compounds. 相似文献
6.
Densities of binary and ternary mixtures containing water + (1,2-ethanediol or 1,2-propanediol or 1,3-propanediol or 1,2-butanediol)
+ (1-n-butyl-3-methylimidazolium bromide at 0.01 mole fraction) at 298.15 K and atmospheric pressure have been determined as a function
of composition using an Anton Paar densimeter (Model DMA 55). Excess molar volumes (VmEV_{\mathrm{m}}^{\mathrm{E}}) were calculated. The values are negative for all mixtures over the whole composition range. 相似文献
7.
The apparent molar volumes (V
φ
) of glycine, L-alanine and L-serine in aqueous 0 to 4 mol⋅kg−1 N-methylacetamide (NMA) solutions have been obtained by density measurement at 298.15 K. The standard partial molar volumes
(Vf0)V_{\phi}^{0}) and standard partial molar volumes of transfer (DtrVf0)\Delta_{\mathrm{tr}}V_{\phi}^{0}) have been determined for these amino acids. It has been show that hydrophilic-hydrophilic interactions between the charged
groups of the amino acids and the –CONH– group of NMA predominate for glycine and L-serine, but for L-alanine the interactions
between its side group (–CH3) and NMA predominate. The –CH3 group of L-alanine has much more influence on the value of DtrVf0\Delta_{\mathrm{tr}}V_{\phi}^{0} than that of the –OH group of L-serine. The results have been interpreted in terms of a co-sphere overlap model. 相似文献
8.
Yameeka Chhikara J. S. Yadav Dimple Sharma V. K. Sharma 《Journal of solution chemistry》2011,40(10):1769-1783
Densities, ρ
123, and speeds of sound, u
123, of 1-methyl pyrrolidin-2-one (1) + benzene or methyl benzene or cyclohexane (2) + propan-2-ol (3) ternary mixtures have
been measured over the entire composition range at 308.15 K and atmospheric pressure. The resulting ρ
123 and V123EV_{123}^{\mathrm{E}} data were utilized to predict excess isentropic compressibilities, (kSE)123(\kappa_{S}^{\mathrm{E}})_{123}, of the studied (1+2+3) mixtures. The observed V123EV_{123}^{\mathrm{E}} and (kSE)123(\kappa_{S}^{\mathrm{E}})_{123} data have been analyzed in terms of Graph theory (which involved the topology of a molecule). It has been observed that V123EV_{123}^{\mathrm{E}} and (kSE)123(\kappa_{S}^{\mathrm{E}})_{123} values determined by Graph theory compare well with their corresponding experimental values. 相似文献
9.
V. K. Sharma Sunil K. Jangra Neeti Saini Jaibir S. Yadav Dimple Sharma 《Journal of solution chemistry》2011,40(9):1563-1581
Excess molar volumes, V
E, excess molar enthalpies, H
E, speeds of sound, u, and vapor-liquid equilibrium data of 1,4-dioxane (1) + aniline or N-methyl aniline or o-toluidine (2) binary mixtures have been measured as a function of composition at 308.15 K. Isentropic compressibility changes
that occur for mixing, kSE\kappa_{S}^{\mathrm{E}}, and excess Gibb’s energies, G
E, have been determined by employing speeds of sound and vapor-liquid equilibrium data. The VE, HE,kSEV^{\mathrm{E}}, H^{\mathrm{E}},\kappa_{S}^{\mathrm{E}} and G
E values have been estimated by (i) graph theory and (ii) the Prigonone-Flory-Patterson theory (PFP). It was observed that
values of VE, HE,kSEV^{\mathrm{E}}, H^{\mathrm{E}},\kappa_{S}^{\mathrm{E}} and G
E predicted by graph theory compare well, relative to the PFP theory, with their corresponding experimental values. 相似文献
10.
Mohammad M. H. Bhuiyan Andrew W. Hakin Jin Lian Liu 《Journal of solution chemistry》2010,39(6):877-896
Apparent molar volumes (V
2,φ
) and heat capacities (C
p2,φ
) of glycine in known concentrations (1.0, 2.0, 4.0, 6.0, and 8.0 mol⋅kg−1) of aqueous formamide (FM), acetamide (AM), and N,N-dimethylacetamide (DMA) solutions at T=298.15 K have been calculated from relative density and specific heat capacity measurements. These measurements were completed
using a vibrating-tube flow densimeter and a Picker flow microcalorimeter, respectively. The concentration dependences of
the apparent molar data have been used to calculate standard partial molar properties. The latter values have been combined
with previously published standard partial molar volumes and heat capacities for glycine in water to calculate volumes and
heat capacities associated with the transfer of glycine from water to the investigated aqueous amide solutions, D[`(V)]2,tro\Delta\overline{V}_{\mathrm{2,tr}}^{\mathrm{o}} and D[`(C)]p2,tro\Delta\overline{C}_{p\mathrm{2,tr}}^{\mathrm{o}} respectively. Calculated values for D[`(V)]2,tro\Delta\overline{V}_{\mathrm{2,tr}}^{\mathrm{o}} and D[`(C)]p2,tro\Delta\overline{C}_{p\mathrm{2,tr}}^{\mathrm{o}} are positive for all investigated concentrations of aqueous FM and AM solutions. However, values for D[`(C)]p2,tro\Delta\overline{C}_{p\mathrm{2,tr}}^{\mathrm{o}} associated with aqueous DMA solutions are found to be negative. The reported transfer properties increase with increasing
co-solute (amide) concentration. This observation is discussed in terms of solute + co-solute interactions. The transfer properties
have also been used to estimate interaction coefficients. 相似文献
11.
The effect of an ionic liquid, 1-ethyl-3-methylimidazolium ethyl sulfate ([EMIm]ESO4), on the thermophysical properties of aqueous D-glucose solutions including density, viscosity, and electrical conductivity
have been investigated at 298.15 K. Using these properties, the apparent molar volumes, V
φ
, the viscosity B-coefficients and the molar conductivities, Λ
m, have been computed for the ternary D-glucose + [EMIm]ESO4+water solutions. The V
φ
values were used to calculate the standard partial molar volumes, Vf0V_{\phi}^{0}, and transfer volumes, DtrVf0\Delta_{\mathrm{tr}}V_{\phi}^{0}, of D-glucose from water to aqueous ionic liquid solutions. These volumetric parameters, for all the solutions studied, are
positive and increase monotonically with increasing the concentration of [EMIm]ESO4. These observations have been interpreted in terms of the interactions between D-glucose and ionic liquid in the aqueous
solution. The viscosity data were analyzed in terms of the Jones-Dole equation to determine the values of the viscosity B-coefficients. The calculated conductometric parameters, the limiting molar conductivities, Λ
0, the association constants, K
a, and the Walden products, Λ
0
η, for [EMIm]ESO4, decrease with increasing concentration of D-glucose. This trend suggests that the ions of an ionic liquid do not have the
same hydrodynamic size in the presence of D-glucose molecules (ILs) and consequently provides evidence for the dehydration
effect of the ionic liquid in aqueous D-glucose solutions. 相似文献
12.
Abstract
Experimental densities ρ, viscosities η, and refractive indices n D of the ternary mixtures consisting of 2-methyltetrahydrofuran + chlorobenzene + cyclopentanone and constituted binary mixtures were measured at T = 298.15 K for the liquid region and at ambient pressure for the whole composition range. Excess molar volumes V\textm\textEV_{\text{m}}^{\text{E}}, deviations in the viscosity Δη, and deviations in the refractive index Δn D from the mole fraction average for the mixtures were derived from the experimental data. The excess partial molar volumes V\textm,i\textEV_{{\text{m}},i}^{\text{E}} were also calculated. The binary and ternary data of V\textm\textEV_{\text{m}}^{\text{E}}, Δη, and Δn D were correlated as a function of the mole fraction by using the Redlich–Kister and the Cibulka equations, respectively. McAllister’s three-body interaction model is used for correlating the kinematic viscosity of binary mixtures with the mole fraction. 相似文献13.
Densities were determined experimentally over the entire range of composition at 298.15 K for the ternary system acetonitrile
(1) + acetophenone (2) + 1,2-pentanediol (3) and for the three corresponding binary systems. Excess molar volumes were calculated
for the binary and the ternary systems. These results were fitted to variable-degree polynomials. Further, the Prigogine-Flory-Patterson
(PFP) theory and Extended Real Associated Solution (ERAS) model were applied to VmEV_{m}^{\mathrm{E}} for the binary mixtures of acetonitrile + acetophenone, acetonitrile + 1,2-pentanediol and acetophenone + 1,2-pentanediol,
and the findings compared with the experimental results. 相似文献
14.
Dilatometric measurements of excess molar volumes, VE and excess partial molar volumes, [`(V)] \texti\textE\overline V _{\text{i}}^{\text{E}} have been made for binary mixtures of acetonitrile with 1,2-ethanediol, 1,2-propanediol, 1,2-butanediol, 1,2-pentanediol, and 1,2-hexanediol at 20°C over the entire composition range. VE for acetonitrile + 1,2-ethanediol and 1,2-propanediol mixtures are negative over the entire range of mole fractions and positive values are obtained for all remaining mixtures. The results are explained in terms of dissociation of the self-associated 1,2-alkanediol molecules and the formation of aggregates between unlike molecules through O—H...N=C hydrogen bonding. From the experimental results, VE were calculated and correlated by Redlich–Kister type function in terms of mole fractions. The excess partial molar volumes were extrapolated to zero concentration to obtain the limiting values at infinite dilution, [`(V)] \texti\textE,o\overline V _{\text{i}}^{{\text{E,o}}}
. 相似文献
15.
Hemayat Shekaari Abolfazl Bezaatpour Rasoul Elhami 《Journal of solution chemistry》2012,41(3):516-524
The apparent molar volumes and viscosities of N,N′-bis(salicylaldehyde)-1,3-diaminopropane Schiff base (Salpr) have been determined in ionic liquid {1-pentyl-3-methylimidazolium
bromide ([PnMIm]Br)} + N,N-dimethylformamide (DMF) solutions at 298.15 K from density and viscosity measurements using a vibrating tube densimeter and
übbelohde type viscometer, respectively. These data have been used to calculate standard partial molar volumes, Vf 0V_{\phi} ^{0}, transfer partial molar volumes, Δtr
V
0, and viscosity B-coefficients of the solutions. The transfer partial molar volumes are negative, and decrease with increasing the concentration
of ionic liquid for all of the investigated solutions. It found that this ionic liquid interacts strongly with the Schiff
base (Salpr) and has desolvation effect on the Schiff base molecules. 相似文献
16.
Wei Guan Wei-Feng Xue Jing Tong Cai-Xia Wang Jia-Zhen Yang 《Journal of solution chemistry》2009,38(11):1463-1469
The molar enthalpies of solution of an alanine-based ionic liquid (IL) [C4mim][Ala], 1-butyl-3-methylimidazolium alanine, containing various amount of water and various molalities Δsol
H
m(wc), were measured with a solution-reaction isoperibol calorimeter at (298.15±0.01) K, where wc denotes water content. According
to Archer’s method, the standard molar enthalpies of solution of [C4mim][Ala] containing known amounts of water,
DsolHmo(wc)\Delta_{\mathrm{sol}}H_{\mathrm{m}}^{\mathrm{o}}(\mathrm{wc})
, were obtained. In order to eliminate the effect of the small amount of residual water in the source [C4mim][Ala], a linear fitting of
DsolHmo(wc)\Delta_{\mathrm{sol}}H_{\mathrm{m}}^{\mathrm{o}}(\mathrm{wc})
against water content was carried out, yielding a good straight line where the intercept is the standard molar enthalpy of
solution of anhydrous [C4mim][Ala],
DsolHmo(pure IL)=-(61.42±0.08)\Delta_{\mathrm{sol}}H_{\mathrm{m}}^{\mathrm{o}}(\mathrm{pure}\ \mathrm{IL})=-(61.42\pm 0.08)
kJ⋅mol−1. The hydration enthalpy of the alanine anion [Ala]− was estimated using Glasser’s lattice energy theory. 相似文献
17.
Iván Alonso Ismael Mozo Isaías García De La Fuente Juan Antonio González José Carlos Cobos 《Journal of solution chemistry》2011,40(12):2057-2071
Densities, ρ, and speeds of sound, u, of 2-heptanone + aniline + N-methylaniline or + pyridine systems have been measured at (293.15, 298.15 and 303.15) K and atmospheric pressure using a
vibrating tube densimeter and sound analyzer. The ρ and u values were used to calculate excess molar volumes, V
E, and the excess functions at 298.15 K for the speed of sound, u
E, the thermal expansion coefficient, apE\alpha_{p}^{\mathrm{E}}, and for the isentropic compressibility, kSE\kappa_{\mathrm{S}}^{\mathrm{E}}. V
E and kSE\kappa_{\mathrm{S}}^{\mathrm{E}} are both negative and increase in the sequence: aniline <N-methylaniline < pyridine. In contrast, u
E is positive and changes in the opposite way. The data suggest the existence of interactions between unlike molecules, which
are much weaker in the pyridine solution. Aromatic amine–alkanone interactions are stronger in mixtures with acetone. The
linear dependence of Rao’s constant with concentration reveals that there is no complex formation in the investigated systems. 相似文献
18.
Excess molar volumes, VE123V^{\mathrm{E}}_{123} of 1,3-dioxolane or 1,4-dioxane (1) + benzene or toluene (2) + formamide or + N,N-dimethylformamide (3) ternary mixtures at 308.15 K and at atmospheric pressure have been determined dilatometrically over
the entire composition range. The excess molar volumes data of these ternary systems were fitted to the Redlich–Kister equation.
The data have been analyzed in terms of Graph theory (model) to understand the nature and strength of molecular interactions
existing in these mixtures. It has been observed that VE123V^{\mathrm{E}}_{123} values predicted by Graph theory compare well with their corresponding experimental values. 相似文献
19.
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
20.
Speeds of sound have been measured in liquid mixtures of cyclopentane with 1-propanol, with 1-pentanol, and with 1-heptanol
across the entire composition range at temperatures of (298.15, 308.15 and 318.15) K and atmospheric pressure. The experimental
speed of sound data were used to estimate the isentropic compressibility κ
S
for all mixtures. The molar volumes were multiplied by the corresponding isentropic compressibilities to obtain estimates
of the molar compressibilities K
S,m. The corresponding KS,mEK_{S,\mathrm{m}}^{\mathrm{E}} values have also been calculated. Theoretical values of the speeds of sound were estimated using theories and empirical relations.
Deviations of the speed of sound, u
D, from the values calculated by different approaches for ideal mixing have been obtained for all mole fractions. 相似文献