LIGHT-SCATTERING STUDY OF SODIUM DODECYL POLYOXYETHYLENE-2-SULFATE MICELLES IN THE PRESENCE OF MULTIVALENT COUNTERIONS
LIGHT-SCATTERING STUDY OF SODIUM DODECYL POLYOXYETHYLENE-2-SULFATE MICELLES IN THE PRESENCE OF MULTIVALENT COUNTERIONS
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DOI：
10.1021/la00005a021
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发表时间：
1995-05-01
期刊：
影响因子：
3.9
通讯作者：
MEHRETEAB, A
中科院分区：
文献类型：
--
作者：
ALARGOVA, R;PETKOV, J;MEHRETEAB, A
用光散射法研究了多价离子存在下十二烷基聚氧乙烯-2-硫酸钠离子胶束的性质。结果表明，即使在极低的离子强度下，二价，特别是三价反离子也会引起胶束大小和形状的剧烈变化。这种效应对Al3+等三价反离子尤其明显。得到了一些棒状胶束的持续长度，并估计了这些棒状胶束的弯曲能。十二烷基聚氧乙烯-2-硫酸钠的增溶能力也取决于二价和三价离子的存在。它随着反价电子从1到3的变化而增加。阴离子表面活性剂在二价和三价反离子存在下增溶能力的增加可能具有实际意义，因为它直接关系到给定洗涤剂组合物的清洁作用。
The properties of ionic micelles of sodium dodecyl polyoxyethylene-2-sulfate in the presence of multivalent ions were investigated by means of Light scattering methods. It was shown that divalent and especially trivalent counterions may lead to dramatic change in the micellar size and shape even at very low ionic strength. This effect is particularly pronounced for trivalent counterions as Al3+. The persistent lengths for some rod-shaped micelles were obtained and the energy of bending of such rods was estimated. The solubilization capacity of sodium dodecyl polyoxyethylene-2-sulfate was shown to be also dependent on the presence of divalent and trivalent ions. it increases with varying the counterion valence from one to thr;ee. The increase of the solubulization capacity of anionic surfactants in the presence of divalent and furthermore trivalent counterions could be of practical importance since it is directly related to the cleaning action of given detergent composition.