The Effects of $Mg^{2+}$ on the Micelle Formation of Nonionic Surfactants

비이온성 계면활성제의 미셀 형성에 미치는 $Mg^{2+}$의 영향

  • Kwon, Oh-Yun (Department of Chemistry, Gyongsang National University) ;
  • Kim, Jung-Sung (Department of Chemistry, Gyongsang National University) ;
  • Paek, U-Hyon (Department of Chemical Education, Taegu University)
  • 권오윤 (경상대학교 자연과학대학 화학과) ;
  • 김정성 (경상대학교 자연과학대학 화학과) ;
  • 백우현 (대구대학교 사범대학 화학교육과)
  • Published : 1993.09.20


In the presence of $Mg^{2+}$, the interaction of nonionic surfactants, $nonylphenol-(ethylene oxide)_n$[NP-nEO; n = 12, 40, 100] with iodine in aqueous solution were investigated by UV-visible spectrophotometer. CMC (critical micelle concentration) was decreased with increasing $Mg^{2+}$ concentration, and those effects depend upon EO (ethylene oxide) numbers. Above CMC, the intensity of interaction peaks by the addition of $Mg^{2+}$ increased and then decreased. The increase in the intensity of the interaction peaks were attributed to the compactness of micelle in the presence of $Mg^{2+}$. These phenomena may be explained by the fact that the linear ethylene oxide chains, to be free configuration in aqueous solution, could form a psuedo-crown ether structures capable of forming complex with $Mg^{2+}$.



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