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Adiabatic Compressibility

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V. P. Stepanov – One of the best experts on this subject based on the ideXlab platform.

  • Adiabatic Compressibility along the two phase saturation line for the molten lif cscl system
    The Journal of Chemical Thermodynamics, 2019
    Co-Authors: V. P. Stepanov

    Abstract:

    Abstract The Adiabatic Compressibility, β , of the immiscible liquid mixture (LiF + CsCl) along the saturation line was experimentally investigated in the temperature range from the melting point to the critical mixing temperature using sound velocity values, u , measured by the pulse method, and density quantities, ρ , determined using the hydrostatic weight procedure based on the relationship β = u −2 ρ −1 . The coefficients of the temperature dependencies for the Compressibility, sound velocity and density of the upper and lower equilibrium phases have opposite signs because of the superposition of the thermal motion intensity of the ions and the change in the phase compositions. The differences Δ β , Δ u and Δ ρ for the equilibrium phases decrease with temperature elevation. The temperature dependencies of the Compressibility, sound velocity and density difference are described using the empirical equations Δ β  ≈  (T c  − T) 1.004 , Δ u ≈ (T c  − T) 1.003 and Δ ρ  ≈  (T c  − T) 0.504 .

  • Density and Adiabatic Compressibility of LiF + KBr Mixtures in the Two-Phase Region
    High Temperature, 2019
    Co-Authors: V. P. Stepanov

    Abstract:

    In this paper, we experimentally studied the Adiabatic Compressibility β of an exfoliating liquid mixture, LiF +KBr, on the saturation line in a temperature range from the melting point to the critical mixing temperature using the sound velocity u measured by the pulse method and the density ρ determined by hydrostatic weighing based on the ratio β = u–2ρ–1.The coefficients of the temperature dependences of the Compressibility and density of the upper and lower equilibrium phases are shown to have opposite signs due to the superposition of the thermal motion of ions and changes in the phase composition. The reduced differences β* and ρ* ​​for the contacting phases decrease with decreasing reduced temperature T* in accordance with the empirical exponential equations β* ≈ T*1.017 and ρ* ≈ T* 0.494.

  • Ultrasonic Study of the Adiabatic Compressibility of Binary Molten Mixtures of Cesium Halides
    Russian Journal of Physical Chemistry A, 2019
    Co-Authors: V. P. Stepanov

    Abstract:

    Using the phase-time approach, the dependences of the speed of sound on the temperature and composition are measured in CsCl–CsBr, CsCl–CsI, and CsBr–CsI molten binary mixtures. The Adiabatic Compressibility of these mixtures is calculated from the experimental values of speed and density. Negative deviations from the additive values of the speed of sound and positive deviations from the additive values of Adiabatic Compressibility are observed. The magnitude of deviation depends on the ratio of the sizes of anions in the mixtures.

Ronald E. Verrall – One of the best experts on this subject based on the ideXlab platform.

  • apparent molar volume and apparent molar Adiabatic Compressibility studies of anesthetic molecules in aqueous micelle solutions of ctab and ctac as a function of surfactant concentration and temperature
    The Journal of Physical Chemistry, 1994
    Co-Authors: Luchun Wang, Ronald E. Verrall

    Abstract:

    Apparent molar volume and Adiabatic Compressibility properties of halothane and isoflurane in aqueous micelle solutions of hexadecyltrimethylammonium bromide (CTAB) and chloride (CTAC) have been studied as a function of surfactant concentration and temperature. Specific conductance measurements of the micellar systems in the presence and absence of the additive molecules were used to estimate the effect of the solubilized additives on the apparent degree of micelle dissociation. As well, 1 H T 1 relaxation and chemical shift studies of the micellized surfactant in the absence and presence of the additive were measured in an attempt to obtain complementary data regarding the solubilization sites of the additives in the micellar systems

  • apparent molar volume and apparent molar Adiabatic Compressibility studies of 2 6 di tert butyl 4 methylphenol and 2 tert butyl 4 methoxyphenol in aqueous micelle solutions of hexadecyltrimethylammonium chloride as a function of surfactant concentrat
    Joint International Conference on Information Sciences, 1993
    Co-Authors: Luchun Wang, Ronald E. Verrall

    Abstract:

    Abstract Ultrasonic velocities and densities of aqueous solutions of cetyltrimethylammonium chloride have been measured at concentrations below 0.35 mol kg-1 at 25, 35, and 45°C. Apparent molar volume and apparent molar Adiabatic Compressibility properties of the aqueous surfactant solutions were derived from these data. Apparent molar volumes and apparent molar Adiabatic compressibilities of 2,6-di-tert-butyl-4-methylphenol and 2-tert-butyl-4-methoxyphenol dissolved in aqueous micellar solutions of cetyltrimethylammonium chloride were determined as a function of surfactant concentration and temperature. The results obtained for the binary and ternary systems are compared with those previously published for binary aqueous cetyltrimethylammonium bromide systems and for ternary systems of this surfactant containing the same additives. The degree of counterion dissociation from the micelles and the effect this has on the extent of hydration of the head group region of the micelle are shown to have an effect on the solubilization sites of hydrophobic-like additives in these micelles.

Dorota Kmiotek – One of the best experts on this subject based on the ideXlab platform.

  • ultrasonic velocity density and Adiabatic Compressibility for 2 6 dimethylpyridine water in the temperature range 293 318 k
    Journal of Chemical & Engineering Data, 1996
    Co-Authors: Stefan Ernst, And Wojciech Marczak, Dorota Kmiotek

    Abstract:

    Ultrasonic velocities and densities for 2,6-dimethylpyridine (1) + water (2) were measured over the entire composition range in the temperature interval 293−318 K. Using the Laplace formula, the Adiabatic Compressibility was calculated. The results and the empirical smoothing polynomials are presented. The density decreases monotonically with an increase of the amine concentration, while the velocity and Compressibility isotherms show two points of interest:  a nearly common crossing point at a mole fraction x1 ≈ 0.03 and extrema at x1 ≈ 0.15.

  • Ultrasonic velocity, density, and Adiabatic Compressibility for 2,6-dimethylpyridine + water in the temperature range 293-318 K
    Journal of Chemical & Engineering Data, 1996
    Co-Authors: Stefan Ernst, And Wojciech Marczak, Dorota Kmiotek

    Abstract:

    Ultrasonic velocities and densities for 2,6-dimethylpyridine (1) + water (2) were measured over the entire composition range in the temperature interval 293−318 K. Using the Laplace formula, the Adiabatic Compressibility was calculated. The results and the empirical smoothing polynomials are presented. The density decreases monotonically with an increase of the amine concentration, while the velocity and Compressibility isotherms show two points of interest:  a nearly common crossing point at a mole fraction x1 ≈ 0.03 and extrema at x1 ≈ 0.15.