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Journal of the Korean Chemical Society (JKCS)

ISSN 1017-2548(Print)
ISSN 2234-8530(Online)
Volume 42, Number 5
JKCSEZ 42(5)
October 20, 1998 

Mixed Micellar Properties of DPC with Other Cationic Surfactants (DTAB, TTAB, and CDEAB)

DPC와 다른 양이온성 계면활성제(DTAB,TTAB 및 CDEAB)와의 혼합마이셀화에 관한 연구
Byung-Hwan Lee

양이온성 계면활성제인 DPC(dodecylpyridinium chloride)와 다른 양이온성 계면활성제인 DTAB(dodecyltrimethylammonium bromide), TTAB(tetradecyltrimethylammonium bromide) 및 CDEAB(cetyldimethylethylammonium bromide)와의 혼합마이셀화를 연구하기 위하여 전도도법을 이용하였다. DPC/DTAB, DPC/TTAB 및 DPC/CDEAB 혼합계면활성제의 마이셀화에 대한 임계마이셀농도(CMC*)와 반대이온의 결합상수값(B)을 각각 α1(DPC의 몰분율)의 함수로서 25℃에서 측정하였으며, 이와같이 측정한 CMC*와 B 값으로부터 유사상태분리모델을 적용함으로써 여러 가지 열역학적 함수값(χi, γi, Ci, aiM, β, ΔHmix 및 ΔGmo)을 계산하고 분석하였다. rm 결과 DPC/CDEAB 혼합계면활성제가 이상적 혼합마이셀모델에서 가장 큰 벗어남을 나타내었으며 DPC/DTAB 혼합계면활성제는 가장 작은 벗어남을 보였다.

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℃ as a function of αl (the overall molc fraction of DPC) by the use of electric conductivity method. Various thermodynamic parameters (Xi, γi, Ci, aiM, β, ΔHmix, and ΔGmo) 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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