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Study of Micellization of Aqueous Sodium Dodecylbenzene Sulfonate in Alcohol Solutions
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Apparent molar volumes, Φv and isentropic compressibilities, κs of monohydric long chain alcohols, nonan-1-ol and decan-1-ol in aqueous solution of anionic surfactant, sodium dodecylbenzene sulfonate (SDBS) have been calculated from experimental densities, ρ and speed of sound, u, measured at 298.15, 303.15, and 308.15 K. The standard partial molar volumes, Φov have been calculated for rationalizing various interactions in the studied solutions. The critical micelle concentration (cmc), of SDBS in dilute aqueous solution of octan-1-ol, at various temperatures was determined from conductance measurements in the range of ∼0.009 to 0.0734 mol%. Thermodynamic parameters of micellization i.e. standard enthalpy change (ΔH0m), standard entropy change (ΔS0m) and standard Gibbs free energy change (ΔG0m) have been evaluated from temperature dependence of cmc. Further, 1H and 13C NMR chemical shift measurements in micelle solutions containing nonan-1-ol and decan-1-ol have also been made and the results are presented and discussed.
Keywords
Thermodynamic Property, Surfactant, Critical Micelle Concentration, Micelle, NMR.
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