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  • Vapor pressure  (4)
  • dimerization constant  (2)
  • activity coefficients  (1)
  • 1
    Electronic Resource
    Electronic Resource
    Vapor pressure studies of hydrophobic interactions. formation of benzene-benzene and cyclohexane-cyclohexanol dimers in dilute aqueous solution (1981)
    Springer
    Journal of solution chemistry 10 (1981), S. 1-20 
    Details
    ISSN: 1572-8927
    Keywords: Vapor pressure ; hydrophobic interaction ; thermodynamics of transfer and dimerization ; benzene ; cyclohexane ; cyclohexanol ; water
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract A new, highly sensitive vapor pressure apparatus has been used to study very dilute solutions of benzene, of cyclohexane, and of mixtures of cyclohexane and cyclohexanol in water at temperatures from 15 to 45°C. The results have been used to calculate the enthalpy, free energy, and heat capacity of transfer of benzene and of cyclohexane from the vapor phase into water at infinite dilution. Values of the equilibrium constant and the enthalpy change have been determined for the reactions (A) $$2{\text{ benzene = (benzene)}}_{\text{2}} $$ and (B) $${\text{cyclohexane + cyclohexanol = cyclohexane }} \cdot {\text{ cyclohexanol}}$$ occurring in dilute aqueous solution. Of particular interest is the result that the enthalpy of dimerization is positive for the two association reactions [4.0±1.0 kcal-mol−1 for reaction (A) and 3.45±0.16 kcal-mol−1 for reaction (B) at 25°C]. The heat capacity change for reaction (B) is −61±39 cal-K−1-mol−1. The results are discussed in relation to current theories and descriptions of hydrophobic interactions.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00652776
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Liquid-vapor equilibrium of dilute aqueous solutions of ethanol and 2-propanol (1984)
    Springer
    Journal of solution chemistry 13 (1984), S. 849-867 
    Details
    ISSN: 1572-8927
    Keywords: Vapor pressure ; fugacities ; interaction coefficients ; osmotic coefficients ; hydrophobic effects ; aqueous ethanol ; aqueous 2-propanol
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract An automated vapor pressure apparatus has been used to obtain highly precise values of the total pressure and composition of aqueous solutions of ethanol and of 2-propanol in the water-rich region at 25 and 35°C. From these results, values of the partial pressures and fugacities of the components and osmotic coefficients have been inferred. Interaction virial coefficients derived from the present results are compared with interaction parameters previously reported for alcohol molecules in dilute aqueous solution. A discussion is given of the relative importance of hydrophobic effects and hydrogen-bonding in producing the unusual thermodynamic properties of aqueous alcohol solutions.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00645332
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    Vapor pressure studies of hydrophobic association. Thermodynamics of fluorobenzene in dilute aqueous solution (1986)
    Springer
    Journal of solution chemistry 15 (1986), S. 947-956 
    Details
    ISSN: 1572-8927
    Keywords: Vapor pressure ; second virial coefficient ; dimerization constant ; hydrophobic interactions ; benzene ; dilute aqueous solutions ; fluorobenzene
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract An automated vapor pressure apparatus has been used to obtain measurements of the vapor pressure of aqueous solutions of fluorobenzene at temperatures of 15, 25, 35, and 45°C, and in the concentration range 0 to 0.011M. The results have been interpreted to infer the dimerization constant of fluorobenzene in very dilute aqueous solutions, equivalent to the second virial coefficient of interaction between fluorobenzene molecules. The hydrophobic association of fluorobenzene molecules is thermodynamically quite similar to that of benzene at comparable temperatures and concentrations. A dimerization constant of fluorobenzene of 0.56 M−1 at 30°C and an endothermic enthalpy of association equal to 3.9 kcal-mol−1 are calculated from the measurements.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00646033
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  • 4
    Electronic Resource
    Electronic Resource
    Thermodynamics of association for benzene-benzyl alcohol, benzene-phenethyl alcohol, and fluorobenzene-benzyl alcohol in dilute aqueous solution (1986)
    Springer
    Journal of solution chemistry 15 (1986), S. 1031-1040 
    Details
    ISSN: 1572-8927
    Keywords: Vapor pressure ; dimerization constant ; hydrophobic association ; benzene ; fluorobenzene ; benzyl alcohol ; phenethyl alcohol ; dilute aqueous solutions
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract Vapor pressure measurements have been made on dilute aqueous solutions of benzene-benzyl alcohol (BZOH), benzene-phenethyl alcohol (PEOH), and fluorobenzene-BZOH at 15, 25, 35, and 45°C. The benzene results have been interpreted with a mass action model which attributes deviations from ideality to the formation of benzene dimers and heterodimers with BZOH and PEOH. The benzene heterodimers form endothermically at 25°C with large and negative heat capacity changes. The dimerization constant for the benzene-BZOH dimer reaches a maximum of 0.57 M−1 at about 37°C, while the benzene-PEOH dimer reaches a maximum of 0.60 M−1 around 30°C. The fluorobenzene results have been interpreted with a mass action model which, in addition to fluorobenzene dimers and heterodimers, includes the formation of a fluorobenzene-BZOH trimer. Thermodynamic properties for these aggregates are reported and compared with results obtained in previous studies.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00645197
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  • 5
    Electronic Resource
    Electronic Resource
    Use of the semi-equilibrium dialysis method in studying the thermodynamics of solubilization of organic compounds in surfactant micelles. Systemn-hexadecylpyridinium chloride-phenol-water (1986)
    Springer
    Journal of solution chemistry 15 (1986), S. 519-529 
    Details
    ISSN: 1572-8927
    Keywords: Solubilization constant ; dialysis ; surfactants ; micelles ; activity coefficients ; n-hexadecylpyridinium chloride ; phenol
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract The semi-equilibrium dialysis method has been used to infer solubilization equilibrium constants or, alternatively, activity coefficients of solutes solubilized into micelles of aqueous surfactant solutions. Methods are described for inferring the concentrationa of monomers of the organic solute and of the surfactant on both sides of the dialysis membrane, under conditions where the organic solute is in equilibrium with both the high-concentration (retentate) and low-concentration (permeate) solutions. By using a form of the Gibbs-Duhem equation, activity coefficients of both phenol (the solubilizate) and n-hexadecylpyridinium chloride (the surfactant) are obtained for aqueous solutions at 25°C throughout a wide range of relative compositions of surfactant and solubilizate within the micelle. The apparent solubilization constant, K=[solubilized phenol]/([monomeric phenol][micellar surfactant]), is found to decrease significantly as the mole fraction of phenol in the micelle increases.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00644893
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    Paper (German National Licenses)
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