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KMID : 1059520060500030190
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Journal of the Korean Chemical Society
2006 Volume.50 No. 3 p.190 ~ p.195
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Thermodynamic Study on the Micellar Properties of DBS/Brij 30 Mixed Surfactant Systems
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이병환/Lee BH
박인정/Park IJ
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Abstract
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The critical micelle concentrations (CMC) and the counter ion binding constants (B) in a micellar state of the mixed surfactant systems of sodium dodecylbenzenesulfonate (DBS) with polyoxyethylene(4) lauryl ether (Brij 30) in water were determined as a function of α1 (the overall mole fraction of DBS) by the use of electric conductivity method and surface tensiometer method from 288 K to 308 K. Various thermodynamic parameters (ΔSmo, ΔHmo, and ΔGmo) for the micellization of DBS/Brij 30 mixtures were calculated and analyzed from the temperature dependence of CMC values. The measured values of ΔGom are all negative but the values of ΔSmo are positive in the whole measured temperature region. On the other hand, the values of ΔHmo are positive or negative, depending on the measured temperature and α1.
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