界面活性剤水溶液への酸素の溶解挙動

概要

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The solubilites of oxygen in aqueous solutions of surface active substances and related compounds were determined by the gas chromatographic method. For quaternary alkyl ammonium bromides and sodium alkanoates having no micelle-forming ability, the solubilities decreased linearly with increasing concentration. On the other hand, for the surface active substances having micelle-forming ability, the solubilities decreased initially and increased after the critical micelle concentration. On the basis of the relationship between the solubility and the carbon number n for the solutions of sodium alkanoates, CH<SUB>3</SUB> (CH<SUB>2</SUB>) nCOONa, the contribution of the polar dissociated group to the oxygen solubility was distinguished from that of the methylene group of alkyl chain and the real contribution of the former was estimated. It was also revealed that the existence of ionic group decreased the solubility by the salting-out effect and the introduction of alkyl group increased the solubility by the hydrophobic interaction. This conclusion is supported from the thermodynamic analysis on the oxygen transfer from pure water into aqueous solutions of surfactants.
社団法人日本油化学会の論文