The molecular architecture of sugar-based surfactants strongly affects their self-assembled structure, i.e., the type of micelles they form, which in turn controls both the dynamics and rheological properties of the system. Here, we report the segmental and mesoscopic structure and dynamics of a series of C16 maltosides with differences in the anomeric configuration and degree of tail unsaturation. Neutron spin-echo measurements showed that the segmental dynamics can be modeled as a one-dimensional array of segments where the dynamics increase with inefficient monomer packing. The network dynamics as characterized by dynamic light scattering show different relaxation modes that can be associated with the micelle structure. Hindered dynamics are observed for arrested networks of worm-like micelles, connected to their shear-thinning rheology, while nonentangled diffusing rods relate to Newtonian rheological behavior. While the design of novel surfactants with controlled properties poses a challenge for synthetic chemistry, we demonstrate how simple variations in the monomer structure can significantly influence the behavior of surfactants.

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几何变化表面活性剂形成胶束的拓扑动力学

糖基表面活性剂的分子结构强烈影响它们的自组装结构，即它们形成的胶束类型，进而控制系统的动力学和流变特性。在这里，我们报告了一系列 C16 麦芽糖苷的节段和细观结构和动力学，其异头构型和尾部不饱和度存在差异。中子自旋回波测量表明，节段动力学可以建模为节段的一维阵列，其中动态随着单体堆积效率的增加而增加。以动态光散射为特征的网络动力学显示出与胶束结构相关的不同弛豫模式。观察到蠕虫状胶束的停滞网络的受阻动力学，与它们的剪切稀化流变性有关，而非缠结扩散棒与牛顿流变行为有关。虽然具有受控性能的新型表面活性剂的设计对合成化学提出了挑战，但我们展示了单体结构的简单变化如何显着影响表面活性剂的行为。