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  • 1
    Electronic Resource
    Electronic Resource
    Effect of tetrahydrofuran on the conductance and ion-pairing of hydrogen chloride in wet and dry methanol mixtures (1995)
    Springer
    Journal of solution chemistry 24 (1995), S. 813-826 
    Details
    ISSN: 1572-8927
    Keywords: Proton mobility ; hydrochloric acid ; wet mixed solvent media ; conductance ; ion-pairing ; methanol-tetrahydrofuran ; physical constants ; excess molar volumes
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract The molar conductance of dilute solutions of HCl in wet (68.5% methanol + 31.5% tetrahydrofurane mixtures at 25°C have been measured. The data were analyzed using the Fuoss-Hsia equation to calculate the infinite dilution molar conductances and association constants. The trend of the limiting conductances in these mixtures as a function of the water content shows, once more, the peculiar minimum due to the anomalous proton conductance mechanism. From these data the limiting molar conductance in the anhydrous binary solvent system was evaluated. The percentage excess proton mobility with respect to potassium ion has also been determined. All these data are compared to those found in a binary isodielectric methanol mixture containing as cosolvent 1,4-dioxane. This comparison shows that proton mobilities are very similar in both solvent mixtures. The dielectric constants, refractive indices, viscosities and densities of the methanol-tetrahydrofuran mixtures in the whole mole fraction range have been measured and are reported. An analysis of the excess molar volumes and viscosities shows a slight deviation of this system from ideality.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01131046
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  • 2
    Electronic Resource
    Electronic Resource
    Study of lecithin reverse micelles by FT-IR spectroscopy (1997)
    Springer
    Colloid & polymer science 105 (1997), S. 220-223 
    Details
    ISSN: 1435-1536
    Keywords: Lecithin ; giant micelles ; organogels ; FT-IR spectroscopy
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract FT-IR spectra of water/lecithin/deuterated cyclohexane microemulsions as a function of water/lecithin molar ratioR (R=[water]/[lecithin]) at various lecithin volume fractions (φ) have been recorded. After elimination of the spectral contributions due to the deuterated cyclohexane and normalization, the band parameters of the CO and PO4 vibrational modes due to lecithin have been found dependent only uponR. This behaviour has been interpreted in terms of a progressive structural modification of the water/lecithin interface superimposed to the progressive hydration of CO and PO4 groups. Moreover, no correlation between the CO and PO4 band parameters and the formation of gel-like micellar solutions has been found. This and other spectral features allow us to raise some doubts on the current structural picture of gel-like micellar solutions.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01188954
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    Paper (German National Licenses)
    Fulltext
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