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KMID : 1059519930370090781
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Journal of the Korean Chemical Society
1993 Volume.37 No. 9 p.781 ~ p.786
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The Effects of Mg2+ on the Micelle Formation of Nonionic Surfactants
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Kwon Oh-Yun
Kim Jung-Sung
Paek U-Hyon
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Abstract
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In the presence of Mg2+, 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 Mg2+ concentration, and those effects depend upon EO (ethylene oxide) numbers. Above CMC, the intensity of interaction peaks by the addition of Mg2+ increased and then decreased. The increase in the intensity of the interaction peaks were attributed to the compactness of micelle in the presence of Mg2+. 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 Mg2+.
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