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KMID : 1059520080520050461
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Journal of the Korean Chemical Society
2008 Volume.52 No. 5 p.461 ~ p.467
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Study on the Micellization of DPC/Brij 35 Mixed Surfactant Systems by the Conductivity Method
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Gil Han-Nae
Lee Byung-Hwan
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Abstract
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The values of critical micelle concentration (CMC) and counter ion binding constants (B) in a micellar state of DPC (1-dodecylpyridinium chloride) with Brij 35 (polyoxyethylene(23) lauryl ether) at 298K in water were determined as a function of α1 (the overall mole fraction of DPC) by the use of electric conductivity method and surface tension method. Various thermodynamic parameters (Xi, γi, Ci, aiM, β 및 △Hmix) were calculated by means of the equations derived from the nonideal mixed micellar model. The results show that the activities of DPC in a micellar state have great negative deviations and those of Brij 35 have great positive deviations from the ideal mixed micellar model. Various thermodynamic parameters ((△Gom, △Hom 및 △Som) for the micellization of DPC/Brij 35 mixtures were calculated also from the temperature dependence of the CMC values. The values of △Gom are all negative, but the values of △Som and △Hom are all positive or negative, depending on the measured temperature and α1.
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KEYWORD
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DPC, Brij 35, Critical Micelle Concentration, Counter Ion Binding Constant, Non-ideal Mixed Micellar Model, Iso-Structural Temperature
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