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  • 1
    Electronic Resource
    Electronic Resource
    Heats of solution of gaseous hydrocarbons in water at 15, 25, and 35°C (1985)
    Springer
    Journal of solution chemistry 14 (1985), S. 827-836 
    Details
    ISSN: 1572-8927
    Keywords: Hydrophobic ; calorimetry ; heat capacity ; hydrocarbons ; water
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract Calorimetrically measured heats of solution of eleven hydrocarbon gases into water are reported at 15 and 25°C. Gases studied are methane, ethane, propane, n-butane, 2-methylpropane, 2,2-dimethylpropane, cyclopropane, ethene, propene, 1-butene, and ethyne. These values in combination with previous results are used to derive heat capacity changes at 25°C. Comparison of enthalpy and heat capacity values with those from other studies shows satisfactory agreement. Correlation of the heat capacity change with the number of water molecules in the first solvation shell of the solute suggests that the observed heat capacity changes are primarily due to changes in the water molecules in this solvent shell.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00646293
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  • 2
    Electronic Resource
    Electronic Resource
    Heats of solution of several freons in water from 5 to 45°C (1987)
    Springer
    Journal of solution chemistry 16 (1987), S. 171-179 
    Details
    ISSN: 1572-8927
    Keywords: Hydrophobic ; calorimetry ; heat capacity ; freons ; water
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract An extensive set of measurements of the heats of solution of a number of fluorine-containing gases (CCl2F2, CClF3, CBrF3, CF4) have been performed from 5 to 45°C. The temperature dependence allows accurate determination of the heat capacity change in the solution process as a function of temperature. To a first approximation these heat capacity results agree with the predictions of the simple two energy state model for water molecules in the first solvation shell. The further extension of the general applicability of this model, originally developed to account for the thermodynamic properties of solvation of hydrocarbon and other small apolar gases in water, suggests that the unique thermodynamic properties of hydrophobic solvation are largely determined by the water molecules in the first solvation shell.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00646984
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    Heats of solution of gaseous hydrocarbons in water at 25°C (1984)
    Springer
    Journal of solution chemistry 13 (1984), S. 27-41 
    Details
    ISSN: 1572-8927
    Keywords: Hydrophobic ; calorimetry ; hydrocarbons ; water ; dissolution heats
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract The heats of solution at 25°C for a number of hydrocarbon gases are reported as measured by a calorimetric method. There is excellent agreement between the standard enthalpy changes of solution measured calorimetrically and those derived from high precision temperature dependent solubility measurements. However the calorimetrically determined standard enthalpies of solution of a number of gases are greatly improved over values obtained from low precision temperature dependent solubility measurements. A method is presented to readily estimate the standard errors in the standard enthalpy change for any process derived from the temperature dependence of the equilibrium constant for the process. Comparison of the standard enthalpies and entropies of solution of hydrocarbon gases in water shows that the standard free energies of solution for all hydrocarbon gases investigated are dominated by unfavorable entropy contributions. A strong linear correlation between the standard entropy of solution and the number of hydrogens in the hydrocarbon molecule is found. This correlation suggests that the hydrocarbon hydrophobic effect is regulated by the number of allowable configurations of a water molecule in contact with each C−H group.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00648589
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    Paper (German National Licenses)
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  • 4
    Electronic Resource
    Electronic Resource
    Theoretical calculations of stress relaxation in concentrated solutions (1963)
    New York : Wiley-Blackwell
    Journal of Polymer Science Part A: General Papers 1 (1963), S. 1779-1787 
    Details
    ISSN: 0449-2951
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: The Mooney theory for stress relaxation of polymer materials has been numerically evaluated in unmodified and modified forms. The modified expressions include such effects as molecular weight distributions and entanglement or polymer interaction distributions. The relaxation behavior was found to be highly dependent upon the number of interaction points per chain molecule particularly for small numbers. The distributions in molecular sizes and in the number of interaction points have a much smaller effect on the shapes of the relaxation curves. A comparison of the theoretical stress relaxation behavior is made with birefringence relaxation data. The region of correlation indicates a number of five interaction points per molecule of polystyrene at 10 wt. % in benzene.
    Additional Material: 4 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/pol.1963.100010528
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    Paper (German National Licenses)
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