KMID : 1059519980420050519
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Journal of the Korean Chemical Society 1998 Volume.42 No. 5 p.519 ~ p.525
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Mixed Micellar Properties of DPC with Other Cationic Surfactants (DTAB, TTAB, and CDEAB)
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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 (B) in a micellar state of the mixed surfactant systems of dodecylpyridinium chloride (DPC) with dodecyltrimethylammonium bromide (DTAB), tetradecyltrimethylammonium bromide (TTAB), and cetyldimethylethylammonium bromide (CDEAB) were determined at 25¡É as a function of ¥ál (the overall molc fraction of DPC) by the use of electric conductivity method. Various thermodynamic parameters (Xi, ¥ãi, Ci, aiM, ¥â, ¥ÄHmix, and ¥ÄGmo) for the micellization of DPC/DTAB, DPC/TTAB, and DPC/CDEAB mixtures were calculated and analyzed for each system by means of the equations derived from the pseudophase separation model. The results show that the DPC/DTAB mixed system has the greatest deviation and the DPC/CDEAB mixed system has the smallest deviation from the ideal mixed micellar model.
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KEYWORD
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