阴离子Gemini表面活性剂和阳离子传统表面活性剂混合体系双水相中囊泡形貌的转变

通过电子显微镜观察了阴离子gemini表面活性剂C₁₁- p-PhCNa和阳离子传统表面活性剂DTAB混合体系双水相中囊泡形貌随体系组成和浓度的转变。结果表明，双水相较浓的一相中形成了多层囊泡，囊泡的大小和壁厚随相的组成和浓度而改变，两组分等电荷混合有利于形成较大且壁较厚的囊泡。分析表明， gemini表面活性剂在聚集体中采取的反式构象可能是其容易形成厚壁多层囊泡的重要原因，C₁₁- p-PhCNa联接链上的苯氧基与DTA⁺之间的p-阳离子相互作用以及两组分相反电性头基之间的静电吸引使囊泡壁的多层结构更加稳定。

Transformation of Vesicles in Aqueous Two‐Phase System of an Anionic Gemini Surfactant and a Cationic Conventional Surfactant Mixture

Transformation of vesicles formed in DTAB/C₁₁‐p‐PhCNa aqueous surfactant two‐phase (ASTP) was observed by the transmission electron microscopy (TEM). The trans‐conformation of the gemini surfactant in the aggregates was considered to be the important factor for constructing the multi‐lamellar structure of the vesicle wall. The cation‐π interaction between the quaternary ammonium cation and the aromatic ring in the spacer was determined by the UV‐Vis spectrum analysis, which, as well as the general electrostatic attraction and hydrophobic force, contributes to the stability of the multi‐lamellar structure. The concentrations of the surface‐active ions were measured for understanding the mechanism of vesicle transformation. The results show that isoelectric mixing of the two components benefits the growth of vesicles both in size and wall thickness.