The
changes in interfacial tension against water, density, and
coefficient of viscosity of a binary mixture of tri-iso-amyl phosphate (TiAP) and n-dodecane have been measured
before and after gamma radiolysis. Density, viscosity, and interfacial
tension of binary mixtures are additive functions of mole fractions
of TiAP and gamma absorbed dose, which respectively form a plane in
three-dimensional plots of linear–linear–linear, loge–loge–linear, and loge–loge–linear scales. Logarithmic interfacial
tension also forms a three-dimensional plane with density and viscosity
in loge–linear–linear plot. Redlich–Kister
type equations (RK-eq) have been introduced to model excess properties
of binary mixtures, where a second independent variable is the absorbed
dose. The parametric coefficients of RK-eqs pertaining to excess molar
volume, viscosity deviations, and interfacial tension deviations of
the mixtures are linear functions of the absorbed dose. Molecular
interactions between solute–solute and solute–solvent
have also been quantified in terms of apparent molar volume at infinite
dilution, among others.
Correlations proposed in this work predict density and viscosity with better accuracy in comparison with existing correlations. Dimensionless specific volume and logarithmic viscosity of binary mixtures are nth order (1 ≤ n ≤ 4) polynomials of the mole fraction of one of the components at the system temperature, and parametric coefficients of such polynomials are mth order (1 ≤ m ≤ 4) polynomials of system temperatures. Parametric coefficients of fitted fourth order Redlich−Kister type equations (RK-eq) are linear functions of temperature. Excess properties and derived thermodynamic properties of both mixtures have been discussed in terms of intramolecular and intermolecular interactions of molecules. Like virial equations of state (EOS), dimensionless RK-eq quantifies to calculate virial coefficients and hence to compute interactions among component 1−1, component 1−2, and component 2−2. Parametric coefficients of the Vogel−Fulcher−Tammann equation of viscosity are polynomials of mole fractions of one of the components.
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