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KMID : 1059519930370030294
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Journal of the Korean Chemical Society
1993 Volume.37 No. 3 p.294 ~ p.301
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pH, Alkaline Earth Metal Ion Effects and Miscibility with Hexadecanol on the Monolayer of Palmitic Acid at the Air-Water Interface
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Chung Jong-Jae
Seo Byung-Il
Lee Hai-Won
Ju Min-Young
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Abstract
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π-A isotherms of the Palmitic acid(PA) with increasing pH shifted to the low area/molecule due to the dissociation of PA at the air-water interface. More condensation of PA monolayers occurred by the addition of Mg2+, Ca2+ and Ba2+ ion in subphase. This condensing effect was increased with increasing the concentration of these ions. Due to the interaction with each ion, PA were formed Mg, Ca, Ba-Palmitate complex. The binding structure between alkaline earth ion and carboxylate ligand in PA has been identified by IR spectrometry. The order of condensing effect of alkaline earth ions at pH 8 was Ca2+ > Ba2+ > Mg2+. The condensing effect except for Mg2+ decreased with increasing atomic number. Whereas, the condensing effect in pure water system decreased with decreasing atomic number in the sequence: Ba2+ > Ca2+ > Mg2+. The miscibility of binary system of PA and hexadecanol in monolayer showed that the miscibility was good for the pure water system. But, in the buffered pH 8 system, bad miscibility was found.
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KEYWORD
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