• Title/Summary/Keyword: lauryl sulfobetaine

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Study on the Solubilization of 4-Chlorobenzoic Acid by Lauryl Sulfobetaine and Mixed Surfactant Systems (Lauryl Sulfobetaine과 혼합계면활성제에 의한 4-클로로벤조산의 가용화에 대한 연구)

  • Lee, Nam-Min;Lee, Byung-Hwan
    • Journal of the Korean Applied Science and Technology
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    • v.31 no.4
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    • pp.612-622
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    • 2014
  • 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.

Mixed Micellar Properties Dodecyldimethyl(3-sulfopropyl)ammonium Hydroxide with Other Surfactants (Dodecyldimethyl(3-sulfopropyl)ammonium Hydroxide와 다른 계면활성제와의 혼합미셀화에 관한 연구)

  • Lee, Nam-Min;Lee, Byung-Hwan
    • Journal of the Korean Applied Science and Technology
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    • v.31 no.4
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    • pp.602-611
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    • 2014
  • 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.