Mixed Micellization and the Dissociated Margules Model for Cationic/Anionic Surfactant Systems
Mixed Micellization and the Dissociated Margules Model for Cationic/Anionic Surfactant Systems
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阳离子/阴离子表面活性剂体系的混合胶束化和解离 Margules 模型
DOI：
10.1021/jp300568k
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发表时间：
2012-05-03
影响因子：
3.3
通讯作者：
Hu, Peng
中科院分区：
文献类型：
--
作者：
Hao, Li-Sheng;Deng, Yao-Tai;Hu, Peng
测定了三种烷基三甲基溴化铵（C（n）TAB）/十二烷基磺酸钠（AS）/H_2O混合体系的第一和第二临界胶束浓度（CMC_1和CMC_2），以及三亚甲基-1，3-双（十二烷基二甲基溴化铵）（12-3-12）/AS/H_2O混合体系的CMC_1。最大的负β（m）值意味着12-3-12与AS之间的协同作用最强。C（n）TAB/AS/H_2O混合体系的CMC_1和CMC_2随n的增大而减小。等摩尔混合体系的CMC 1值最小，而C（n）TAB/AS/H2O混合体系的CMC 2值随表面活性较高的表面活性剂组成的增加而减小。当C（16）TAB/AS混合体系远离等摩尔时，比反作用降低CMC_1的作用按Hofmeister级数增加。在其它较宽的组成范围内，C（16）TAB/AS/H_2O混合体系的CMC_1值受盐影响较小或无盐影响。提出了假相分离模型和解离的Margules模型，并对混合CMC 1进行了满意的描述，计算的胶束组成与zeta电位测量的组成信息吻合较好。在C（16）TAB/AS/H2O混合体系中加入盐，使CMC 2有一定程度的降低。除反离子效应外，还用柯林斯的水亲和力匹配概念解释了共离子效应对混合体系CMC 2的影响。
The first and the second critical micelle concentration (CMC1 and CMC2) for three alkyltrimethylammonium bromide (C(n)TAB)/sodium dodecylsulfonate (AS)/H2O mixed systems, and CMC1 for trimethylene-1,3-bis(dodecyldimethylammonium bromide) (12-3-12)/AS/H2O mixed system have been measured. The largest negative beta(m) value means the strongest synergism between 12-3-12 and AS. The CMC1 and CMC2 for the C(n)TAB/AS/H2O mixed systems decrease with the increase of n. The equimolar mixed systems give the smallest CMC1 values, whereas the CMC2 values decrease with the increase of the composition of the surfactant with higher surface activity in the C(n)TAB/AS/H2O mixed systems. For the C(16)TAB/AS mixed systems far from equimolar, specific counterion effect on lowering CMC1 enhances according to the Hofmeister series. There is slightly or no salt effect on the CMC1 of the other wide composition range of C(16)TAB/AS/H2O mixed system. The pseudophase separation model coupled with the dissociated Margules model has been proposed and gives satisfactory description of the mixed CMC1, the calculated micellar compositions are in well accordance with composition information from the zeta potential measurements. The addition of salt into the C(16)TAB/AS/H2O mixed system, leads to a certain degree of decrease in CMC2. In addition to counterion effect, the co-ion effect on CMC2 of the mixed system was explained using Collins' concept of matching water affinities.