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ISSN 1017-2548(Print)
ISSN 2234-8530(Online)
Volume 52, Number 5
JKCSEZ 52(5)
October 20, 2008 |
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Title |
Study on the Micellization of DPC/Brij 35 Mixed Surfactant Systems by the Conductivity Method
전도도법에 의한 DPC/Brij 35 혼합계면활성제의 미셀화에 대한 연구
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Author |
Han-Nae Gil, Byung-Hwan Lee*
길한내, 이병환*
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Keywords |
DPC, Brij 35, 임계미셀농도, 반대이온결합상수, 비이상적 혼합미셀모델, 등구조온도
, DPC, Brij 35, Critical Micelle Concentration, Counter Ion Binding Constant, Non-ideal Mixed Micellar Model, Iso-Structural Temperature.
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Abstract |
DPC(1-dodecylpyridinium chloride)와 Brij 35(polyoxyethylene(23) lauryl ether)의 혼합미셀화에 대한 임계미셀농도(CMC)와 반대이온 결합상수값(B)을 298K의 순수 물에서 DPC의 겉보기몰분율(α1)의 함수로서 전 도도법으로 측정하였다. 이와 같이 측정한 CMC값에 비이상적 혼합미셀화모델을 적용함으로써 여러 가지 열 역학적 함수값(Xi, γi, Ci, aiM, β 및 △Hmix)을 계산하고 분석하였다. 또한 온도에 따른 CMC값의 변화로부터 DPC/Brij 35 혼합계면활성제의 미셀화에 대한 열역학 함수값(△Gom, △Hom 및 △Som)을 계산하였다. 그 결과, △Gom값은 모두 음의 값을 나타내었지만, △Hom와 △Som의 값은 측정한 온도와 α1의 값에 따라 음 혹은 양의 값을 나타내었다.
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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461 - 467 |
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