Control and Modification of Primary and Secondary Self-Assembly Processes

摘要-9814399U。Delaware建议使用电子显微镜、光学、X射线和中子散射以及其他测量来发现和表征合成和生物混合表面活性剂体系中的一系列新的微结构。这些结构提供了极好的机会：(1)扩大了表面活性剂溶液微观结构的范围，从简单的胶束和片层相的限制扩展到包括平衡小泡和凝胶，(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。到目前为止，这导致了一种假设，即混合胶束形成、单尾的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；这些低的双层弯曲常数随后导致观察到的结构和相行为。这项建议的工作旨在(1)通过测量作为组成函数的弹性常数来直接检验这一假设，以及(2)开发基于低端模数双层膜的新材料，例如聚合物-表面活性剂凝胶。将探索在阴离子混合物中通过氟碳化合物与烃类表面活性剂的交换产生新的性质的想法。这些组件将被用来指导更高阶结构的合成。这方面的工作将探索通过聚合阴离子微囊来合成可控渗透性微囊。

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.