MICELLE SIZE AND SHAPE OF SODIUM DODECYL-SULFATE IN CONCENTRATED NACL SOLUTIONS
MICELLE SIZE AND SHAPE OF SODIUM DODECYL-SULFATE IN CONCENTRATED NACL SOLUTIONS
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DOI：
10.1021/j100444a011
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发表时间：
1980-01-01
影响因子：
--
通讯作者：
IKEDA, S
中科院分区：
文献类型：
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作者：
HAYASHI, S;IKEDA, S
在不同温度下、不同浓度的氯化钠存在下，测量了十二烷基硫酸钠水溶液的光散射；在浓度高于 0.45 M 的 NaCl 溶液中，随着表面活性剂浓度的增加，在临界胶束浓度下形成的表面活性剂胶束进一步缔合成大胶束。在 25°C 的 0.60 和 0.80 M NaCl 中，光散射表现出异常不对称性，这归因于痕量微凝胶颗粒的形成。在 35 C 的 0.80 M NaCl 中，光散射是正常的，在 1.10 X 10~ 2 g cm" 3 下，胶束聚集数高达 1410。角度依赖性表明形成了长度为 597 Á 的棒状胶束。得出结论，十二烷基硫酸钠在低 NaCl 浓度（< 0.45 M）下形成球形胶束，但它缔合成 当胶束浓度高时，在高 NaCl 浓度下会形成棒状胶束。
Light scattering from aqueous solutions of sodium dodecyl sulfate has been measured in the presence of NaCI of different concentrations at different temperatures; In NaCI solutions more concentrated than 0.45 M, surfactant micelles formed at the critical micelle concentration further associate into large micelles with increasing surfactant concentration. In 0.60 and 0.80 M NaCI at 25 C, light scattering exhibits anomalous dissymmetry attributable to the formation of trace amounts of microgel particles. In 0.80 M NaCI at 35 C, light scattering is normal and gives themicelle aggregation number as high as 1410 at 1.10 X 10~ 2 g cm" 3. The angulardependence indicates formation of a rodlike micelle having a length of 597 Á. It is concluded that sodium dodecyl sulfate forms spherical micelles at low NaCI concentrations (< 0.45 M), but it associates into rodlike micelles at high NaCI concentrations when its micelle concentration is high.