Microstructures and rheological dynamics of viscoelastic solutions in a catanionic surfactant system.
Microstructures and rheological dynamics of viscoelastic solutions in a catanionic surfactant system.
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DOI：
10.1016/j.jcis.2009.05.076
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发表时间：
2009-10
影响因子：
9.9
通讯作者：
Haiqing Yin;Yiyang Lin;Jianbin Huang
中科院分区：
文献类型：
--
作者：
Haiqing Yin;Yiyang Lin;Jianbin Huang
采用流变学和动态光散射（DLS）相结合的方法，系统研究了十二烷基三乙基溴化铵（DTEAB）/十二烷基硫酸钠（SDS）（摩尔比为27/73）阴阳离子表面活性剂体系中形成的粘弹性溶液。蠕虫状胶束开始形成以上的总表面活性剂浓度（Ctotal）的120 mM的小圆柱形胶束的增长。随后发现该体系在170- 210 mM的中间浓度范围内表现出具有麦克斯韦流体特征的线性粘弹性，其产生于蠕虫状胶束的三维缠结网络。在较高的表面活性剂浓度下，可能发生从线性胶束到支化结构的过渡。最后，讨论了表面活性剂头基对阴阳离子表面活性剂混合物流变性能的影响。
Viscoelastic solutions formed in a catanionic surfactant system of dodecyltriethylammonium bromide (DTEAB)/sodium dodecylsulfate (SDS) at the molar ratio of 27/73 were systematically studied using a combination of rheology and dynamic light scattering (DLS). Wormlike micelles began to form above the total surfactant concentration (Ctotal) of 120mM by the growth of small cylindrical micelles. Subsequently the system was found to exhibit linear viscoelasticity with characteristic of a Maxwell fluid in the intermediate concentration range of 170–210mM, which arose from a 3D entangled network of wormlike micelles. At higher surfactant concentrations, a transition from linear micelles to branched structures probably took place. Finally and significantly, the effect of the surfactant headgroup on the rheological property of catanionic surfactant mixtures was discussed.