Dielectric and Excess Dielectric Constants of Acetonitrile + Butyl Amine, + Ethylamine, and + Methylamine at 303, 313, and 323 K (original) (raw)
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Journal of Chemical & Engineering Data, 2007
Static dielectric constants of acetonitrile/water mixtures in the whole composition range and within the temperature range from (15 to 60)°C have been measured. The values were fitted to a unique equation as a simultaneous function of temperature and acetonitrile composition. Densities of these mixtures at temperatures from (5 to 55)°C and different compositions have been collected from the literature. The complete data set was critically analyzed, the outliers were excluded, and the remaining values were also fitted to a unique equation as a function of temperature and acetonitrile composition. From the dielectric constants and densities, the activity coefficients of ions can be calculated by means of the Debye-Hückel approach, allowing the study of the ionic equilibria and determination of reference pH values or acidity constants in any acetonitrile/water mixture at any temperature within the studied range.
Dielectric characterization of binary solvents containing acetonitrile
Analytical Chemistry, 1987
For electrochemical solvents containing acetonitrile (AN) paired with a cosolvent havlng elther a lower or hlgher dleledrk constant ( E ) , the trend In E , vs. mde fractlon Is usually nonllnear at 25 'C. Maxlma or mlnlma occur In the excess function (At) among representatlve systems and the magnitude of that deviatlon with respect to pure AN Is goverened by the dlpolarlty, pdarirability, and any hydrogen bondJng tendency from the added cosolvent. The empirical patterns In didecMc behavlor for 10 solvent systems including AN-pdar aprotk and AN-hydrogen bond donor paks conform to rational correlatlon functlons for E , = t ( X , ) over the complete mole fraction range.
Computation of dielectric constants of solvent mixtures and electrolyte solutions
Fluid Phase Equilibria, 2001
A general model has been developed for calculating the static dielectric constant of mixed-solvent electrolyte solutions. For mixtures of solvents without electrolyte components, the model is based on an empirical modification of the Kirkwood theory for multicomponent systems. For systems containing electrolytes, the model takes into account the effects of ions and ion pairs and, therefore, it is capable of reproducing the dependence of the dielectric constant on electrolyte concentration. For most solvent mixtures, dielectric constants can be reasonably predicted using only pure solvent properties. In the case of strongly nonideal solvent mixtures, the results can be significantly improved by adjusting a single binary parameter. The model has also been verified for a number of electrolyte solutions in various solvents over wide composition and temperature ranges. In particular, the increase in the dielectric constant due to ion pairing and its decrease due to the presence of ions and their solvation can be accurately represented.
Dielectric behaviour of acrylic ester-organic solvent mixtures
Journal of Chemical Sciences, 1997
A~tracL Dielectric constants and refractive indices of fifteen binary mixtures containing methyl methacrylate (MMA), ethyl methacrylate (EMA) or butyl methacrylate (BMA), with hexane, heptane, carbon tetrachloride, chlorobenzene or o-dichlorobenzene are measured at 303.15 K. The excess dielectric constants, c ~, excess molar polarizations, P2 and excess orientation polarizations, P~ were calculated from the measured properties of the pure and mixed components. An attempt was also made to provide qualitative interpretation of the complex molecular interactions involved based on the sign and magnitude of the excess dielectric function.
Dielectric properties of binary mixtures. 5. Dilute alcohol/nonpolar solvent systems
The Journal of Physical Chemistry, 1982
A simple model is used for dilute polar/nonpolar systems, based on the additivity of electric susceptibilities of a solute/solvent interaction species and a nonpolar solvent. A spherical cavity is considered. Permittivity values, calculated as a function of concentration, are in good agreement with experimental results when the model is applied to systems containing water or lower alcohols in nine nonpolar solvents.
Dielectric Behavior of Acetonitrile + N-Butyl Alcohol Binary Mixtures at Microwave Frequency at 10°C
IOSR Journals , 2019
Values of dielectric constant (ε′) and dielectric loss (ε″) have been experimentally determined for binary liquid mixtures of acetonitrile with n-butyl alcohol at 10.75 GHz microwave frequencies at 10 0 C and over the complete mole fraction range. The values of (ε′) and (ε″) have been used to evaluate the loss tangent (tan), molar polarization (P 12) and a.c. conductivity (ζ p).The results are discussed in terms of intermolecular interactions. It has been shown that the results are positive over the whole range of composition. Viscosity, density and refractive index measurement of pure liquid and binary liquid mixtures were carried out at 10 0 C. The values of viscosity have been used to evaluate the activation energy (E a).These parameters have been used to explain the formation of hydrogen bonding and formation of complex in the binary liquid mixtures.
Dielectric spectroscopy of organic solvents ofvarying polarity
2016
The dielectric constant and the conductivity for several organic solvents of varying polarity and for colloidal suspensions are measured using dielectric spectroscopy as a function of frequency, over the frequency range 0.1 Hz to 100 kHz. These measurements are carried out for organic solvents of different polarities: cyclohexyl bromide (CHB), castor oil, cis+trans-decahydronaphtalene (decalin) and decane. In addition, dielectric spectroscopy is carried out for polymethylmethacrylate (PMMA) colloidal spheres in the intermediate polar mixture of cyclohexy bromide (C 6 H 11 Br,(CHB)) and 20% cis+trans-decalin by volume. The primary result in this thesis is the examination of electrode polarization effects, which were observed at low frequency in CHB and CHB-decalin mixtures. A
Lithuanian Journal of Physics
The dielectric dispersion ε' and dielectric loss ε" of binary mixture of 1,2-diaminopropane-dimethylaminoethanol were measured by employing the time domain reflectometry technique over a frequency range from 10 MHz to 20 GHz at 288, 298, 308, and 318 K temperatures. The accuracy in the measurement of the ε' and ε" values obtained from this technique is within ±5%. To evaluate various dielectric parameters, the frequency dependents complex permittivity (ε*(ω) = ε'-iε") data, viz., static permittivity ε 0 , relaxation time τ, and permittivity at high frequency ε ∞ were fitted by the nonlinear least-squares fit method to Debye expression. Temperature dependent ε 0 , τ, Kirkwood correlation factor g, free energy of activation ΔG, and enthalpy of activation ΔH have been determined and discussed in terms of the effect of-NH 2 and-CH 3 side-group on molecular dynamics and intermolecular hydrogen bonds. The dielectric behaviour of 1,2-diaminopropane and dimethylaminoethanol liquid molecules and their conformations as well as molecular dynamics of the system can be explored only by comparing the dielectric data of the mixture system with the dielectric data of the individual molecules and their dynamics.
Static dielectric constants of 1,2-dichloroethane + 1,2-dimethoxyethane binary mixtures
Annali Di Chimica, 1995
Static dielectric constants (E) were measured for mixtures of 1,2-dichloroethane (DCE, 1) + 2-methoxyethanol (ME, 2) + 1,2-dimethoxyethane (DME, 3) at 19 temperatures in the range-10 < t/°C < 80, employing 12 ternaries covering the whole composition range expressed by the mole fractions 0 < X~, X 2, X 3 < 1. Empirical fitting equations of the type E = e(T), 8 = E(X i) and ~ = ~(T, Xi), which might be useful for correlation and interpolation procedures, were used to represent the experimental data. The excess mixing property 6 E has been evaluated to investigate the presence of solvent-cosolvent adducts at each temperature. The quantity 6 E has been found to be partly positive and partly negative in the ternary domain {Xt, X 2, X3}. As a consequence, it is possible to observe an isoline at e E= 0 at each temperature. Such a line represents a large set of ternary mixtures having a pseudo-ideal dielectric behavior, even being formed by interacting components.