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• W2070367195 abstract "Abstract The distribution coefficients (K) of alcohols (1-butanol, 1-pentanol, 1-hexanol, and 1-heptanol) between the aqueous and sodium dodecyl sulfate (SDS) micellar phases at 40 and 55°C were determined in addition to that at 25°C. The standard free energy change (ΔG°p) of penetration of the alcohol from the aqueous to the micellar phase was obtained using the equation ΔG°p = -RT ln(K). There is a linear relation between ΔG°p and the carbon number of the alcohols, and the increment in ΔG°p per methylene group slightly decreases with increasing temperature. The standard enthalpy change (ΔH°p) and entropy change (ΔS°p) of penetration of the alcohol were estimated at 10, 25, 40, and 55°C by the use of temperature variation of the K and the Gibbs-Helmholtz equation. The fact that both ΔH°p and ΔS°p become less positive with the increase in temperature indicates that at lower temperature the penetration of the alcohol into micelle exhibits a greater entropy dependence. Estimated values of ΔH°p were compared with calorimetrical values. At 40 and 55°C, similar to that at 25°C, linear relations are observed between K and critical micelle concentration (CMC) decrease upon the addition of the alcohols. From the linear relations, ISA (interaction of surfactant and additive) coefficients defined as d ln(CMC)/dYa = (ISA)K were obtained to be −0.95 and −0.56 at 40 and 55°C, respectively, where Ya is the mole fraction of the alcohol in the aqueous phase, d ln(Q)/dXa was estimated from ISA, where Q is the degree of ionization of ionic micelles, and Xa is the mole fraction of the alcohol in the micellar phase. The theoretical value of d ln(Q)/dXa from ISA was compared with the experimental one, and a good agreement was obtained between them." @default.
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• W2070367195 date "1984-10-01" @default.
• W2070367195 modified "2023-09-29" @default.
• W2070367195 title "Effects of temperature on the distribution of 1-alcohols in aqueous SDS micellar solutions and ISA (Interaction of Surfactant and Additive) Coefficients" @default.
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• W2070367195 doi "https://doi.org/10.1016/0021-9797(84)90043-2" @default.
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