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  • 1
    Electronic Resource
    Electronic Resource
    Direct observation of hydrophobic interactions in aqueous solutions of organic compounds by supercooling and enthalpies of mixing (1997)
    Springer
    Journal of thermal analysis and calorimetry 49 (1997), S. 581-588 
    Details
    ISSN: 1572-8943
    Keywords: enthalpy of mixing ; hydrophobic hydration ; isopropyl alcohol ; supercooling temperature ; tetrahydrofuran
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract Supercooling temperatures and enthalpies of mixing with some solvents have been examined for two kinds of solutions subjected to different thermal treatments (solutions I and II) of tetrahydrofuran (THF), isopropyl alcohol (2-PrOH), and ethyleneglycol butylether (BE), and ethyleneglycol isobutylether (i-BE) in order to observe more directly the structural organization of water molecules around a nonpolar molecule in an aqueous solution. For THF and 2-PrOH solutions, supercooling temperatures of solution I were found to be 2–3 degrees higher than those of solution II, and differences ΔHI-ΔHII were found to be about 3 kJ mol−1. It has been concluded that these results directly reflect the difference in the stability of hydrogen-bonded water networks in an aqueous solution.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01996739
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  • 2
    Electronic Resource
    Electronic Resource
    The Measurement of Heat Capacity Differences Due to the Change of Water Structure in Aqueous Solutions of Organic Compounds (1999)
    Springer
    Journal of thermal analysis and calorimetry 56 (1999), S. 1367-1373 
    Details
    ISSN: 1572-8943
    Keywords: differential scanning calorimetry ; heat capacity ; hydrophobic hydration ; quaternary ammonium salts
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract In order to observe more directly the structural organization of water molecules around a non-polar molecule in an aqueous solution, heat capacity differences between two kinds of solutions (solution I and II) of quaternary ammonium salts were measured. In the solution I stable water structure was retained as much as possible and in the solution II water structure was destroyed either by heating to high temperatures or by irradiating with ultrasonic waves. It was found that the heat capacity differences ((Cp)II-(Cp)I) were slightly positive and its maximum values corresponded to 7-8 percent of the heat capacity of pure water itself.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1010114725106
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    Paper (German National Licenses)
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