混合表面活性剂水溶液自组装特性研究

Study on Properties of Self-Assembly of Ionic-Nonionic Mixed Surfactants in Aqueous Solution

在以表面活性剂为模板的仿生合成中,模板的自组装特性是关键环节。由于混合胶团的存在,两种表面活性剂的水溶液体系的效能高于单一表面活性剂溶液;利用试验优选合适的混合表面活性剂用于仿生合成,耗费时间长,成本高。本文从热力角度出发,分析了混合成胶自由能的影响,建立了离子 非离子混合表面活性剂的自组装模型,利用该模型模拟考察了混合表面活性剂的混合临界胶团浓度和胶团组成等参数,得到了其影响因素及作用规律,并进行了部分试验验证,二者吻合得较好。

Self-assembly properties of surfactants play important roles in the biomimetic synthesis,which used surfactants as templates.The mixed surfactants exhibit many novel features which have important theoretical and applied interest.It is time-consuming and highly expensive to determine the optimal self-assembles from surfactants mixtures only through experimental observations.In this article,a model for self-assembly of an ionic-nonionic mixed surfactant is established based on thermodynamic principles,which involves free energy changes of micelle mixtures.In comparison with references data and experiment results,it is indicated that the esablished model can used to well estimate the regulations of the mixed ionic-nonionic system,such as the mixed CMC,the micelle compositions and so on.