Journal of the Korean Applied Science and Technology (한국응용과학기술학회지)

The Korean Society of Applied Science and Technology (한국응용과학기술학회)
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Study on the Solubilization of 4-Chlorobenzoic Acid by Aqueous Solutions of Various Cationic, Nonionic, and Mixed Surfactant Systems

양이온성, 비이온성 및 혼합성 계면활성제에 의한 4-클로로벤조산의 가용화에 대한 연구

  • Lee, Nam-Min (Department of Applied Chemical Engineering, Korea University of Tech. & Education) ;
  • Lee, Byung-Hwan (Department of Applied Chemical Engineering, Korea University of Tech. & Education)
  • 이남민 (한국기술교육대학교 응용화학공학과) ;
  • 이병환 (한국기술교육대학교 응용화학공학과)
  • Received : 2014.05.29
  • Accepted : 2014.06.26
  • Published : 2014.06.30
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Abstract

The interactions of 4-chlorobenzoic acid with the micellar system of various cationic, nonionic, and mixed surfactant systems were studied by the UV/Vis spectrophotometric method. The solubilization constants ($K_s$) of 4-chlorobenzoic acid into those micellar systems have been measured at various temperatures and various thermodynamic parameters for the solubilization of 4-chlorobenzoic acid have been calculated and analyzed from those changes. The results show that the values of ${\Delta}G^o_s$ are all negative within the measured temperature range and that the values of ${\Delta}H^o_s$ and ${\Delta}S^o_s$ are all positive. The effects of alkyl-group's length of surfactant molecules on the solubilization of 4-chlorobenzoic acid have been also measured. The values of $K_s$ were dependent simultaneously on the alkyl-group's length and the kind of head-group in surfactant molecules. From these changes we can postulate the solubilization site and the degree of interaction of 4-chlorobenzoic acid with the micellar systems.

여러 종류의 양이온성, 비이온성 및 혼합성 계면활성제 수용액에서 4-클로로벤조산의 가용화 현상을 UV/Vis 분광광도법을 이용하여 연구하였다. 또한 온도의 변화에 따른 가용화상수값($K_s$)의 변화를 측정함으로써 열역학적 함수값들을 계산하고 분석하였다. 그 결과 모든 계면활성제의 용액에서 4-클로로벤조산의 가용화에 대한 ${\Delta}G^o_s$ 값은 측정범위 내에서 모두 음의 값을 나타내었으며, ${\Delta}H^o_s$ 값과 ${\Delta}S^o_s$ 값은 모두 양의 값을 나타내었다. 계면활성제 종류와 계면활성제분자의 알킬-그룹 길이에 따라 $K_s$ 값이 큰 폭으로 변하였으며, 그런 결과로부터 4-클로로벤조산이 미셀 내에서 가용화되는 위치와 미셀과의 상호작용의 정도를 예측할 수 있었다.

Keywords

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