Department of Chemistry, Sapienza University of Rome, P. le A. Moro 5, 00185 Roma, Italy.
Phys Chem Chem Phys. 2018 Jul 18;20(28):18957-18968. doi: 10.1039/c8cp02745e.
Self-assembled structures formed by mixtures of cationic and anionic surfactants are interesting tools for applications requiring interactions with charged particles and molecules. Nevertheless, they present instability close to the equimolar composition and poor morphological versatility, which is generally restricted to vesicles and micelles. Against this general trend, we report on bile salt derivative based catanionic mixtures assembling in tubules and lamellae depending on the mixture composition. Electrophoretic mobility measurements prove that the composition also dictates their superficial charge, which can be tuned from negative to positive by increasing the positively charged surfactant fraction in the mixtures. The study of the catanionic aggregates was conducted by means of microscopy and spectroscopy techniques and compared to the self-assembly behaviors of the individual building blocks. This study broadens the so far small array of bile salt derivative catanionic systems, confirming their distinctive behavior in the spectrum of catanionic mixtures.
由阳离子和阴离子表面活性剂混合物形成的自组装结构是应用于需要与带电粒子和分子相互作用的有趣工具。然而，它们在接近等摩尔组成时表现出不稳定性，并且形态多样性较差，通常仅限于囊泡和胶束。针对这一普遍趋势，我们报告了基于胆汁盐衍生物的反离子混合物在管状和层状结构中组装，具体取决于混合物的组成。电泳迁移率测量证明，组成还决定了它们的表面电荷，可以通过增加混合物中带正电荷的表面活性剂部分从负电荷调至正电荷。通过显微镜和光谱技术研究了反离子聚集体，并将其与单个构建块的自组装行为进行了比较。这项研究扩大了迄今为止胆汁盐衍生物反离子系统的小范围，证实了它们在反离子混合物光谱中的独特行为。
