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首页> 外文期刊>RSC Advances >pH responsive vesicles with tunable size formed by single-tailed surfactants with a dendritic headgroup
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pH responsive vesicles with tunable size formed by single-tailed surfactants with a dendritic headgroup

机译：具有树突状头基的单尾表面活性剂形成的具有大小可调的pH响应囊泡

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The structure–activity relationship of surfactants is a topic that has been pursued for a long time in colloid science. We report a study on the self-assembling of a new type of surfactant with a dendritic headgroup in dilute aqueous solutions. Three surfactants, N-alkyldipropionic acids (ADPA) with different chain lengths (n = 14, 16, and 18), were synthesized. As a result of the carboxylic acids and one tertiary amine in the headgroup, the protonation state of the surfactants changes with pH. The morphology of the surfactant aggregates in aqueous solutions was studied at various pH values by transmission electron microscopy (TEM) and dynamic light scattering (DLS). Vesicles were formed spontaneously at pH > 5. Potentiometric titration, turbidity and surface tension were used to determine the effect of protonation state on aggregation behavior. The results show that the vesicle size depends directly on the pH of the solution. The size distribution of vesicles was analyzed by the model of spontaneous curvature. The thermodynamic stability of the vesicles can be attributed to long-range repulsive interactions caused by the low bending modulus of the bilayers.
机译：表面活性剂的结构-活性关系是胶体科学中长期以来一直追求的话题。我们报告了在稀水溶液中具有树突状首基的新型表面活性剂的自组装研究。合成了三种不同链长（ n = 14、16和18）的表面活性剂 N -烷基二丙酸（ADPA）。由于头基团中的羧酸和一种叔胺，表面活性剂的质子化状态随pH的变化而变化。通过透射电子显微镜（TEM）和动态光散射（DLS）研究了在各种pH值下水溶液中表面活性剂聚集体的形态。在> 5的pH下自发形成囊泡。使用电位滴定法，浊度和表面张力确定质子化状态对聚集行为的影响。结果表明，囊泡大小直接取决于溶液的pH。通过自发曲率模型分析了囊泡的大小分布。囊泡的热力学稳定性可以归因于双层的低弯曲模量引起的长程排斥相互作用。

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