한국응용과학기술학회지 (Journal of the Korean Applied Science and Technology)

  • 제31권4호
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  • Pages.612-622
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  • 2014
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  • 1225-9098(pISSN)
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  • 2288-1069(eISSN)
한국응용과학기술학회 (The Korean Society of Applied Science and Technology)
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Lauryl Sulfobetaine과 혼합계면활성제에 의한 4-클로로벤조산의 가용화에 대한 연구

Study on the Solubilization of 4-Chlorobenzoic Acid by Lauryl Sulfobetaine and Mixed Surfactant Systems

  • 이남민 (한국기술교육대학교 응용화학공학과) ;
  • 이병환 (한국기술교육대학교 응용화학공학과)
  • 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)
  • 투고 : 2014.10.27
  • 심사 : 2014.12.15
  • 발행 : 2014.12.30
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초록

본 연구에서는 양쪽성 계면활성제인 lauryl sulfobetaine(LSB)과 혼합계면활성제를 이용하여 광범위한 온도변화에서 4-클로로벤조산의 가용화현상을 알아보고자 한다. 이런 가용화현상에 미치는 온도효과와 계면활성제분자에서 알킬기의 길이에 대한 효과를 조사하였다. 가용화상수값($K_s$)은 UV/Vis 법에서 용액의 전체 흡광도를 측정하여 계면활성제의 농도에 대해 도시하여 그 기울기로부터 구하였다. 모든 계면활성제용액에서 4-클로로벤조산의 가용화에 대한 ${\Delta}G^o_s$값은 측정범위 내에서 모두 음의 값을 나타내었으며, 온도가 증가할수록 감소하였다. 그리고 ${\Delta}H^o_s$값과 ${\Delta}S^o_s$값은 모두 양의 값을 나타내었으며, 온도가 증가할수록 증가하였다. 즉, 계면활성제의 종류와 온도의 변화에 따라 $K_s$ 값과 열역학적 함수값이 큰 폭으로 변하였으며, 그런 결과로부터 4-클로로벤조산이 미셀의 어느 부분에 가용화되는지를 예측할 수 있었다.

In this study, we investigated the solubilization 4-chlorobenzoic acid in a wide range of temperature using a zwitterionic surfactant of lauryl sulfobetaine(LSB) and mixed surfactant systems. The effects of temperature and alkyl-group's length of surfactant molecule on the solubilization of 4-chlorobenzoic acid have been measured. The solubilization constants ($K_s$) were taken by the UV/Vis spectrophotometric method, plotting the total absorbance of the solution versus the surfactant concentration. The results show that the values of ${\Delta}G^o_s$ are all negative within the measured temperature range and decrease by increasing temperature, And also the measured values of ${\Delta}H^o_s$ and ${\Delta}S^o_s$ are all positive and increase by increasing temperature. The values of $K_s$ and thermodynamic parameters are simultaneously dependent on the temperature and the kinds of surfactant molecules. From the results we can postulate the solubilization site of 4-chlorobenzoic acid within the micelle.

키워드

참고문헌

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피인용 문헌

  1. Effects of Surfactant Molecules’ Head- and Tail-groups on the Solubilization of p-Chlorobenzoic Acid vol.59, pp.5, 2015, https://doi.org/10.5012/jkcs.2015.59.5.379
  2. 양이온성 계면활성제 (DTAB, TTAB 및 CTAB)에 의한 아닐린의 가용화에 대한 열역학적 고찰 vol.36, pp.4, 2014, https://doi.org/10.12925/jkocs.2019.36.4.1143
  3. 양이온계면활성제에 의한 4-알킬아닐린 유도체의 가용화에서 알킬치환기, 계면활성제 및 온도의 효과 vol.37, pp.2, 2020, https://doi.org/10.12925/jkocs.2020.37.2.250