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KMID : 1059519990430060614
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Journal of the Korean Chemical Society
1999 Volume.43 No. 6 p.614 ~ p.620
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Thermodynamic Study on the Mixed Micellization of Cationic Surfactants DPC and TTAB
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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 Dodecylpyridinium chloride (DPC) and Tetradecyltrimethylammonium bromide (TTAB) have been determined from the concentration dependence of electrical conductance at various temperatures from 4 ℃ to 36 ℃. Thermodynamic parameters (△Cp, △Gm, △Hm, and △Sm), associated with the micelle formation of DPC/TTAB mixtures, have been estimated from the temperature dependence of CMC and βvalues. The measured values of △Cp and △Gm are negative but the values of △Sm, are positive in the whole measured temperature region. The values of △Hm are positive at low temperature region and negative at high temperature region. The results show that all of the thermodynamic parameters are dependent on temperature and mole fraction of DPC(αDPC).
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KEYWORD
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