在更接近技术应用相关条件下理解聚电解质-表面活性剂混合物在水汽界面的行为
Towards understanding the behavior of polyelectrolyte surfactant mixtures at the water vapor interface closer to technologically relevant conditions
AI总结：
针对现有聚电解质-表面活性剂混合物研究浓度远低于商用配方的问题，研究浓缩混合物在水汽界面的吸附行为，发现动力学捕获聚集体影响界面形貌及协同共吸附转变等特征，填补实际应用条件下的认知空白。
摘要：
聚电解质-表面活性剂混合物及其与流体界面的相互作用因在技术应用中的用途而成为重要研究领域。现有关于这些体系的多数认知都基于聚电解质浓度比商用配方低约50倍的模型。本工作朝着弥合对更贴近实际应用条件下其行为理解的差距迈出了一步。研究采用粗混合方案制备的聚二烯丙基二甲基氯化铵与N-月桂酰基-N-甲基牛磺酸钠的浓缩混合物在水汽界面的吸附行为，运用了多种表面张力技术、布儒斯特角显微镜、中子反射法以及若干本体表征技术。混合过程中形成的动力学捕获聚集体会影响在平衡单相区制备的混合物的界面形貌，不过表面张力等温线的波动结果会随所采用的张力测量技术而变化。在低本体表面活性剂浓度下，游离表面活性剂浓度极低，且界面组成与本体复合物的变化趋势一致，这一行为在更稀混合物的研究中尚未被观察到。然而，在所研究的更高本体表面活性剂浓度下，观察到向复合物与游离表面活性剂协同共吸附的转变。这种转变似乎是这些更浓缩混合物的一个特殊特征，在未来对含额外组分体系的研究中值得关注。
英文摘要：
Polyelectrolyte surfactant mixtures and their interactions with fluid interfaces are an important research field due to their use in technological applications. Most of the existing knowledge on these systems is based on models in which the polyelectrolyte concentration is around 50 times lower than that used in commercial formulations. The present work marks a step to close the gap on the understanding of their behavior under more practically relevant conditions. The adsorption of concentrated mixtures of poly(diallyldimethylammonium) chloride and sodium N lauroyl N methyltaurate at the water-vapor interface with a crude mixing protocol has been studied by different surface tension techniques, Brewster angle microscopy, neutron reflectometry, and several bulk characterization techniques. Kinetically trapped aggregates formed during mixing influence the interfacial morphology of mixtures produced in the equilibrium one phase region, yet fluctuations in the surface tension isotherm result depending on the tensiometric technique applied. At low bulk surfactant concentrations, the free surfactant concentration is very low, and the interfacial composition matches the trend of the bulk complexes, which is a behavior that has not been observed in studies on more dilute mixtures. Nevertheless, a transition to synergistic co-adsorption of complexes and free surfactant is observed at the higher bulk surfactant concentrations studied. This transition appears to be a special feature of these more concentrated mixtures, which deserves attention in future studies of systems with additional components.
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