モノセチルリン酸塩の水面への吸着に関する物理化学的研究

概要

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Surface chemical properties of disodium and dipotassium monocetyl phosphates (CPNa_2 and CPK_2,respectively) were studied mainly by the measurement of surface tension of their aqueous solution with variously added alkali (NaOH, KOH). The theory of Gibbs' adsorption was examined for the case of uni-bivalent-type CP-salts in the presence of a uni-univalent electrolyte, and the surface excess concentration (r) and the area/molecule (A) of CP-salts in adsorbed monolayers were calculated. It was thereby found that r of CPNa_2 is larger than that of CPK_2,and that the cmc and the surface tension at cmc (γcmc) of CPNa_2 are smaller than those of CPK_2. The difference of surface chemical properties between CPNa_2 and CPK_2 is attributed to the lower water solubility of CPNa_2 than CPK_2,which would result in easier adsorption and micelle formation. Counter-ion dependence of r was similar not to dodecyl sulfate but to stearic acid.
社団法人日本薬学会の論文
1970-09-25