Journal of the Korean Applied Science and Technology (한국응용과학기술학회지)

The Korean Society of Applied Science and Technology (한국응용과학기술학회)
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Mixed Micellar Properties Dodecyldimethyl(3-sulfopropyl)ammonium Hydroxide with Other Surfactants

Dodecyldimethyl(3-sulfopropyl)ammonium Hydroxide와 다른 계면활성제와의 혼합미셀화에 관한 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 : 2014.10.27
  • Accepted : 2014.12.08
  • Published : 2014.12.30
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Abstract

The critical micelle concentration (CMC) of the zwitterionic surfactant of dodecyldimethyl(3-sulfopropyl)ammonium hydroxide(LSB, $CH_3(CH_2)_{11}N^+(CH_3)_2(CH_2)_3SO{_3}^-$) and LSB/Tween-20, LSB/Tween-40, LSB/Tween-80 and LSB/DTAB, LSB/TTAB, LSB/CTAB mixed surfactant systems were determined by using the UV/Vis absorbance method from 284 K to 312 K. And the effects of temperature on the micellization have been measured for the thermodynamic study. The results show that the measured values of gibbs free energy are all negative in the whole measured. The values of enthalpy are positive Tween-20, And negative other surfactants. but the values of entropy are positive in the whole measured temperature region. The results show that all of the thermodynamic parameters are dependent on temperature and alkyl-group's length.

양쪽성 계면활성제인 dodecyldimethyl(3-sulfopropyl)ammonium hydroxide(LSB, $CH_3(CH_2)_{11}N^+(CH_3)_2(CH_2)_3SO{_3}^-$)와 LSB/Tween-20, LSB/Tween-40, LSB/Tween-80 및 LSB/DTAB, LSB/TTAB, LSB/CTAB 혼합계면활성제의 임계미셀농도(CMC)값을 284 K에서 312 K의 온도범위에서 UV/Vis 분광광도법으로 측정하였다. 열역학적 연구를 위해 온도의 변화가 미셀화에 어떤 영향을 미치는지를 분석하였다. 계산한 결과 측정범위 내에서 미셀화에 따른 깁스 자유에너지값은 측정범위 내에서 모두 음의 값을 나타내었다. 한편 엔탈피값은 Tween-20에서는 양의 값을 그리고 다른 계면활성제에서는 음의 값을 나타내었다. 엔트로피값은 측정한 온도범위 내에서 모두 양의 값을 나타내었다. 또한 모든 열역학 함수값들은 온도와 알킬-그룹의 길이에 따라 큰 변화를 보였다.

Keywords

References

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