Control and Modification of Primary and Secondary Self-Assembly Processes

摘要-9814399 U。DelawareIt建议使用，电子显微镜，光，X射线和中子散射，和其他测量，发现和表征一个动物园的新的微观结构在合成和生物混合表面活性剂系统。 这些结构提供了极好的机会：（1）将表面活性剂溶液微观结构的范围从简单的胶束和层状相扩展到包括平衡囊泡和凝胶，（2）定量测试表面活性剂自组装理论，以及（3）允许开发具有重要科学和技术应用的新材料。 迄今为止，这导致了这样的假设，即混合胶束形成，单尾阴离子和阳离子表面活性剂导致具有低弯曲常数的混合双层;这些低双层弯曲常数然后负责观察到的结构和相行为。 该提案下的工作旨在（1）通过测量弹性常数作为组成的函数来直接测试这一假设，以及（2）开发基于低末端模量双层（如聚合物-表面活性剂凝胶）的新材料。 将探讨在阴阳离子混合物中碳氟化合物与烃类表面活性剂的交换所产生的新性质。 这些组件将被用来指导合成的高阶结构。 这一领域的工作将探索通过阴阳离子囊泡的聚合来合成可控渗透性囊泡。

ABSTRACTCTS-9814399U. DelawareIt is proposed to use, electron microscopy, light, X-ray and neutron scattering, and other measurements to discover and characterize a menagerie of novel microstructures in synthetic and biological mixed surfactant systems. These structures offer excellent opportunities to: (1) enlarge the realm of surfactant solution microstructure from the limits of simple micelles and lamellar phases to include equilibrium vesicles and gels, (2) quantitiatively test theories of surfactant self-assembly, and (3) allow the development of new materials with important scientific and technological applications. This to date has led to the hypothesis that mixing micelle forming, single-tailed anionic and cationic surfactants lead to mixed bilayers with low bending constants; these low bilayer bending constants are then responsible for the observed structures and phase behavior. The work under this proposal is designed to (1) directly test this hypothesis by measuring elastic constants as a function of composition and (2) develop new materials based on low ending modulus bilayers such as polymer-surfactant gels. The idea that novel properties emerge from the exchange of fluorocarbon for hydrocarbon surfactant in catanionic mixtures will be explored. These assemblies will be used to guide synthesis of higher order structures. Work in this area will explore synthesis of controlled permeability vesicles by polymerization of catanionic vesicles.