Polyelectrolyte-Micelle Complexes

聚电解质与带相反电荷的胶体和表面的结合在生物现象和环境过程中是重要的。结合能受控于胶体表面电荷密度、多离子结合序列的有效电荷和德拜屏蔽长度。此外，生成的络合物或聚集体的结构还取决于胶体颗粒的尺寸、多离子的链长以及这两种物质的浓度。这项工作描述了聚电解质-非离子/离子胶束体系作为研究这些影响的范例。通过建立临界结合条件下各种参数之间的相互关系来探索相互作用能量学。可溶多离子胶束复合体的结构将使用静态和动态光散射作为两个大离子物种的尺寸的函数来探索。特别令人感兴趣的是，随着胶束的尺寸相对于聚离子的尺寸增加，胶束从聚合物内胶束结合到聚合物桥联。建立的现象学关系将与目前的理论处理方法进行比较，并将评估其对其他带电胶体的普遍适用性，例如二氧化硅。

The binding of polyelectrolytes to oppositely charged colloids and surfaces is important in biological phenomena and in environmental processes. The binding energetics are controlled by the colloid surface charge density, the effective charge of the polyion binding sequence, and the Debye screening length. The structure of the resultant complexes or aggregates depends, in addition, on the dimensions of the colloidal particle, the chain length of the polyion, and the concentrations of these two species. This work describes polyelectrolyte - nonionic/ionic micelle systems as a paradigm for the investigation of these effects. Interaction energetics will be explored by establishing the interrelationship among various parameters at critical binding conditions. The structure of soluble polyion-micelle complexes will be explored using static and dynamic light scattering, as a function of the dimensions of the two macroionic species. Of special interest is the transition from intrapolymer micelle binding, to polymer bridging of micelles, as the size of the micelle increases relative to that of the polyion. Phenomenological relationships developed will be compared to current theoretical treatments, and their general utility will be evaluated for other charged colloids, e.g. silica.