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KMID : 1059519960400060420
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Journal of the Korean Chemical Society
1996 Volume.40 No. 6 p.420 ~ p.426
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Thermodynamics on the Mixed Micellization of Sodium Dodecylsulfate(SDS) with Sodium Dodecylbenzenesulfonate(DBS) in Pure Water
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Lee Byung-Hwan
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Abstract
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The critical micelle concentration(CMC) and the counterion binding constant(β) at the CMC of the mixtures of Sodium dodecylsulfate(SDS) with Sodium dodecylbenzenesulfonate(DBS) in aqueous solutions have been determined from the concentration dependence of electrical conductance at several temperatures from 15℃ to 35℃. Thermodynamic parameters(ΔG°m, ΔH°m, ΔS°m and ΔCp), associated with the micelle formation of SDS/DBS mixtures, have been estimated from the temperature dependence of CMC and β values. The measured values of ΔG°m and ΔCp are negative but the values of ΔS°m are positive in the whole measured temperature region. The significance of these thermodynamic parameters and their relation to the theory of the micelle formation of SDS/DBS mixtures have been also considered.
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KEYWORD
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