Effect of Cosurfactant on Microemulsion Phase Behavior in NP7 Surfactant System

보조계면활성제가 NP7 계면활성제 시스템의 마이크로에멀젼 형성에 미치는 영향에 관한 연구

  • Lim, HeungKyoon (Department of Chemical and Biochemical Engineering, Dongguk University-Seoul) ;
  • Lee, Seul (Department of Chemical and Biochemical Engineering, Dongguk University-Seoul) ;
  • Mo, DaHee (Department of Chemical and Biochemical Engineering, Dongguk University-Seoul) ;
  • Lim, JongChoo (Department of Chemical and Biochemical Engineering, Dongguk University-Seoul)
  • 임흥균 (동국대학교-서울 공과대학 화공생물공학과) ;
  • 이슬 (동국대학교-서울 공과대학 화공생물공학과) ;
  • 모다희 (동국대학교-서울 공과대학 화공생물공학과) ;
  • 임종주 (동국대학교-서울 공과대학 화공생물공학과)
  • Received : 2011.05.06
  • Accepted : 2011.05.25
  • Published : 2011.08.10

Abstract

In this study, the effect of cosurfactant on the phase equilibrium and dynamic behavior was studied in systems containing NP7 nonionic surfactant solutions and nonpolar hydrocarbon oils. All cosurfactants used during this study such as n-pentanol, n-octanol and n-decanol acted as a hydrophobic additive and thus promoted the transition from an oil in water (O/W) microemulsion (${\mu}E$) in equilibrium with an excess oil phase to a three-phase region containing excess water, excess oil, and a middle-phase microemulsion and further to a water in oil (W/O) ${\mu}E$ in equilibrium with the excess water phase. The transition temperature was found to decrease with both increases in the chain length and amount of addition of a cosurfactant. Dynamic behavior studies under O/W ${\mu}E$ conditions showed that an oil drop size decreased with time due to the solubilization into micelles. On the other hand, both the spontaneous emulsification of water into the oil phase and the expansion of oil drop were observed under W/O ${\mu}E$ conditions because of the diffusion of surfactant and water into the oil phase. Under conditions of a three-phase region including a middle-phase ${\mu}E$, both the rapid solubilization and emulsification of the oil into aqueous solutions were found mainly due to the existence of ultra-low interfacial tension. Dynamic interfacial tension measurements have been found to be in a good agreement with dynamic behavior results.

Acknowledgement

Supported by : 한국연구재단

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