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  • 1
    Electronic Resource
    Electronic Resource
    Chemical equilibrium model for the thermodynamic properties of mixed aqueous micellar systems: Application to thermodynamic functions of transfer (1984)
    Springer
    Journal of solution chemistry 13 (1984), S. 1-25 
    Details
    ISSN: 1572-8927
    Keywords: Mixed micelles ; surfactant ; alcohol-water mixture ; solubilization ; thermodynamic function of transfer ; volume ; enthalpy ; hydrophobic solutes ; heat capacity
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract Mixed micelles can be formed in water between various pairs of hydrophobic solutes such as surfactants, alcohols and hydrocarbons. These systems can often be studied through the thermodynamic functions of transfer of one of the solutes, usually kept near infinite dilution, from water to an aqueous solution of the other solute. When mixed micelles are formed, these functions change significantly, and often go through extrema, in the region where the binary system micellizes or undergoes some microphase transition.Three main effects are responsible for the observed trends: pair-wise interactions between both solutes in the monomeric form, a distribution of the reference solute between the aqueous and micellar phases and a shift in the monomer-micelle equilibrium in the vicinity of the reference solute. Simple equations can be derived for these three effects which can account for the sign and magnitude of the observed trends using parameters which are derived for the most part from the two binary systems.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00648588
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  • 2
    Electronic Resource
    Electronic Resource
    Thermodynamics of aqueous mixtures of 2-(2-Hexyloxyethoxy)ethanol at 5°C (1993)
    Springer
    Journal of solution chemistry 22 (1993), S. 1041-1062 
    Details
    ISSN: 1572-8927
    Keywords: Excess quantities ; reduced and apparent excess quantities ; molar volume ; molar isentropic compressibility ; ultrasonic speed ; alkyl poly(ethyleneglycol) monoether
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract The densities and the ultrasonic speeds of the aqueous solutions of 2-(2-hexyloxyethoxy)ethanol (C6E2) were measured over the entire range of mole fractions at 5°C. Excess molar volumes V E were readily calculated from the densities. The densities, in combination with the ultrasonic speeds, furnish estimates of the molar (and excess molar) isentropic compressibilities K S and the deviations u D of the ultrasonic speeds from the values calculated for ideal mixtures. Radical changes in the mole fraction derivatives of the excess molar properties of the (C6E2 + water) system, in the vicinity of an amphiphile mole fraction of 0.003, indicate that C6E2 like C6E3 is capable of micelle formation. Our data have been compared with those reported earlier for (C4E2 +, C2E2 +, and C6E3 + water). We have employed both mass action and pseudophase approaches to data analysis, together with the four-segment model approach.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00647728
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