Journal of Environmental Science International (한국환경과학회지)

The Korean Environmental Sciences Society (한국환경과학회)
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Hydrophilic and Hydrophobic Group Characteristics for Nonionic Surfactants

비이온 계면활성제에 대한 친수성기와 소수성기의 그룹 특성

  • Ha, Youn-Shick (Department of Chemistry, College of Natural Science, Kyeongsang National University) ;
  • Son, Man-Shick (Department of Chemistry, College of Natural Science, Kyeongsang National University) ;
  • Paek, U-Hyon (Department of Chemistry, College of Natural Science, Kyeongsang National University)
  • 하윤식 (경상대학교 자연과학대학 화학과) ;
  • 손만식 (경상대학교 자연과학대학 화학과) ;
  • 백우현 (경상대학교 자연과학대학 화학과)
  • Published : 1994.03.01
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Abstract

On the basis of the principle of Bratch's electronegativity equalization, we calculated group partial charges and group electronegativities for nonionic surfactants with Pauling's elecoonegativity parameters by using numerical calculation method. From calculated outputs we have investigated structural stability of micelle, characteristics of hydrophilic and hydrophobic groups, and relation between CMC(Critical Micelle Concentraion) and group partial charge and group electronegativity of hydrophilic and hydrophobic groups for nonionic surfactants. We have known that CMC by micelle formation depends upon group partial charge and group electronegativity of hydrophilic and hydrophobic groups for surfactants. Also, the structural stability of micelle in H2O solution is related to the electric double layer by the hydrophilic group of nonionic surfactants with H atoms in water CMC is diminished by the decrease of repeating units in hydrophilic group at constant hydrophobic group and is diminished by the increments of alkyl chains in hydrophobic group at constant hydrophilic group for nonionic surfactants. In conclusion, CMC is diminished because there is no electrostatic repulsion and is diminished of Debye length by the increments of partial charge of hydrophobic group.

Keywords

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