Studies of Aqueous Sodium Dodecyl Sulfate Solutions by Activity Measurements

化学 威猛牌 反离子 水溶液 临界胶束浓度 活度系数 吸附 十二烷基硫酸钠 肺表面活性物质 表面张力 胶束 离子 胶束化热力学 吉布斯等温线 分配系数 渗透系数 分析化学(期刊) 色谱法 热力学 物理化学 有机化学 物理 生物化学
作者
Tsunetaka Sasaki,Michihiro Hattori,Jun Sasaki,Kenji Nukina
出处
期刊:Bulletin of the Chemical Society of Japan [Oxford University Press]
卷期号:48 (5): 1397-1403 被引量:209
标识
DOI:10.1246/bcsj.48.1397
摘要

Abstract The activities of surfactant ions (aD) and counterions (aNa) were directly obtained by the EMF measurement of a concentration cell with an ion-exchange membrane and by pNa measurements respectively for aqueous solutions of sodium dodecyl sulfate (NaDS) below and above the CMC. The mean activity and activity coefficient were also calculated. From these data, together with the surface tension (γ) measured by the Wilhelmy method and the amount of adsorption (Γ) measured by the radiotracer method, the following results were obtained: (1) Mean activity was not constant, but increased with the concentration above the CMC. (2) The Gibbs adsorption isotherm was directly verified from the aD and aNa vs. concentration relations. (3) The decrease in γ observed above the CMC was in agreement with that calculated from the activity data. (4) The logaD vs. logaNa plots above the CMC showed a linear relation, indicating the validity of the charged phase separation model as the mechanism of micelle formation. The degree of the counterion attachment of the micelles was found to be 0.73 up to about 80 mmol/l. (5) The intermicellar concentrations of Na+ and DS− ions were calculated; the former increases, while the latter decreases with the concentration. (6) The product of the concentration with an osmotic coefficient was linear with the concentration above the CMC, tangent of the slope being about 0.7.
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