Applied Chemistry for Engineering (공업화학)

The Korean Society of Industrial and Engineering Chemistry (한국공업화학회)
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Synthesis and Characterization of Interfacial Properties of Sorbitan Laurate Surfactant

Sorbitan Laurate 계면활성제 합성 및 계면 특성에 관한 연구

  • Lee, Seul (Dept. of Chemical and Biochemical Engineering, Dongguk University-Seoul) ;
  • Kim, ByeongJo (AK ChemTech Central Research Lab.) ;
  • Lee, JongGi (AK ChemTech Central Research Lab.) ;
  • Lim, JongChoo (Dept. of Chemical and Biochemical Engineering, Dongguk University-Seoul)
  • 이슬 (동국대학교-서울 공과대학 화공생물공학과) ;
  • 김병조 (에이케이켐텍(주) 중앙연구소) ;
  • 이종기 (에이케이켐텍(주) 중앙연구소) ;
  • 임종주 (동국대학교-서울 공과대학 화공생물공학과)
  • Received : 2010.08.12
  • Accepted : 2010.09.01
  • Published : 2011.02.10
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Abstract

The critical micelle concentration (CMC) of sorbitan laurate SP 20 surfactant in this paper was near $7.216{\times}10^{-4}mol/L$ and the surface tension at CMC was about 26.0 mN/m, which showed higher CMC and lower surface tension than those of octylphenol ethoxylate octylphenol ethoxylate (OPE) 10 surfactant. Dynamic surface tension measurement using a maximum bubble pressure tensiometer showed that the adsorption rate at the interface between air and surfactant solution was found to be slower with SP 20 surfactant, presumably due to a low mobility of SP 20 surfactant monomer. The contact angle of SP 20 surfactant solution was observed to decrease with an increase in surfactant concentration and showed a larger value than that of OPE 10 surfactant solution. Half-life time for foams generated with 1 wt% surfactant solution was also larger with SP 20 surfactant, which indicated higher foam stability with SP 20 surfactant. Dynamic behavior study reveals that the solubilization of n-decane oil was much lower with SP 20, which is in good agreement with experimental results of foam stability, contact angle and CMC. Dynamic interfacial tension measurement by a spinning drop tensiometer shows that interfacial tensions at equilibrium condition in both systems were almost the same but the time required to reach equilibrium was longer with SP 20.

합성한 sorbitan laurate SP 20의 CMC 값은 약 $7.216{\times}10^{-4}mol/L$로서 옥틸페놀 에톡실레이트 OPE 10에 비하여 약간 크지만, CMC에서의 표면장력은 26.0 mN/m로 OPE 10에 비하여 작았다. 또한 SP 20의 경우에는 OPE 10 계면활성제와 비교하며 공기와 수용액의 계면이 계면활성제 단분자에 의하여 포화되는 데 더 많은 시간이 소요되었다. SP 20 계면활성제 수용액의 접촉각은 계면활성제 농도가 증가함에 따라 감소하였으며, 동일한 계면활성제 농도에서 OPE 10에 비하여 접촉각이 큼을 알 수 있었다. OPE 10과 SP 20 계면활성제 수용액의 거품 반감기는 각각 770, 1268 s로서 SP 20 계면활성제가 OPE 10 계면활성제에 비하여 거품의 안정성이 크며, 이러한 결과는 표면장력 측정 결과와 일치하였다. OPE 10에 비하여 SP 20의 가용화 속도는 매우 낮으며, 이러한 결과는 foam stability, 접촉각 및 CMC 실험 결과와 일치하였다. OPE 10과 SP 20 시스템의 평형에서의 계면장력은 각각 0.659, 0.742 mN/m으로서 비슷한 값을 나타내었으나, OPE 10의 경우에는 비교적 짧은 시간 내에 계면장력이 평형에 도달하는 것에 비하여 SP 10의 경우에는 계면장력이 평형 값에 도달하는데 약 25 min이 소요되었다.

Keywords

Acknowledgement

Supported by : 동국대학교

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