Solubilization of a water-insoluble dye in aqueous solutions of dodecyltrimethylammonium halides, and its relation to micelle size and shape
Solubilization of a water-insoluble dye in aqueous solutions of dodecyltrimethylammonium halides, and its relation to micelle size and shape
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水不溶性染料在十二烷基三甲基卤化铵水溶液中的溶解度及其与胶束尺寸和形状的关系
DOI：
10.1016/0021-9797(86)90338-3
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发表时间：
1986
期刊：
影响因子：
--
通讯作者：
S. Ikeda
中科院分区：
文献类型：
--
作者：
T. Imae;A. Abe;Y. Taguchi;S. Ikeda
参照已报道的分子质量数据，测定了十二烷基三甲基卤化铵卤化钠水溶液对难溶染料苏丹红B的增溶性能，并与胶束的大小和形状有关。十二烷基三甲基氯化铵胶束溶液对苏丹红B的增溶能力为2.8×10-3摩尔染料/摩尔表面活性剂，与−浓度无关，最高为4.0M，只形成球形胶束。十二烷基三甲基溴化铵胶束溶液的增溶力随溴化钠浓度的增加而略有增加，在1.0-1.5MNaBr时，每摩尔表面活性剂的增溶力从2.9×10−3增加到3.9×10−3，对应于球棒转变。十二烷基三甲基溴化铵在棒状胶束中的增溶能力大于在球形胶束中的增溶能力。由十二烷基三甲基铵离子组成的球形胶束的增溶能力几乎与反离子种类无关，无论是氯离子还是溴离子。球形胶束和棒状胶束的增溶能力几乎都随着胶束尺寸的增大而线性增加。通过对十二烷基三甲基卤化铵水溶液的密度测定，求出了表面活性剂的偏摩尔体积，发现十二烷基三甲基铵离子对表面活性剂的偏摩尔体积的贡献是相等的。十二烷基三甲基铵离子在胶束中的堆积状态在两种表面活性剂中都是常见的，对于球形和棒状胶束也是如此。
The solubilization properties of aqueous sodium halide solutions of dodecyltrimethylammonium halides have been measured for a water-insoluble dye, Sudan Red B, and they are related to the micelle size and shape, by referring to the molecular weight data already reported. The solubilization power of micellar solutions of dodecyltrimethylammonium chloride toward Sudan Red B is 2.8 × 10−3mole of dye per mole of surfactant, independent of the NaCl concentration up to 4.0M, where only spherical micelles are formed. The solubilization power of micellar solutions of dodecyltrimethylammonium bromide slightly increases with increasing NaBr concentration and abruptly increases from 2.9 × 10−3to 3.9 × 10−3mole of dye per mole of surfactant, at 1.0–1.5MNaBr, corresponding to the sphere-rod transition. The solubilization power of dodecyltrimethylammonium bromide is higher in rodlike micelles than in spherical micelles. The solubilization capacity of a spherical micelle composed of dodecyltrimethylammonium ions is nearly independent of counterion species, either chloride or bromide ion. The solubilization capacities of both spherical and rodlike micelles increase with their size almost linearly. From the density measurements of aqueous solutions of dodecyltrimethylammonium halides, the partial molar volume of surfactants is derived, and it is found that dodecyltrimethylammonium ions have an equal contribution to the partial molar volume of surfactant. The packing state of dodecyltrimethylammonium ions in micelles is common for both surfactants, and also for spherical and rodlike micelles.