Lipid and polyampholyte monolayers to study polyelectrolyte interactions and structure at interfaces
Lipid and polyampholyte monolayers to study polyelectrolyte interactions and structure at interfaces
复制标题
脂质和聚两性电解质单层用于研究聚电解质相互作用和界面结构
DOI：
--
复制
发表时间：
2004
期刊：
影响因子：
--
通讯作者：
M. Stamm
中科院分区：
文献类型：
--
作者：
H. Möhwald;H. Menzel;C. Helm;M. Stamm
脂质和聚两性电解质单层被证明是研究聚电解质界面静电和空间相互作用的有趣模型。在空气/水界面用朗缪尔单层进行测量，获得吸附过程的能量学和动力学。新开发的光学显微镜、x射线衍射和反射技术可以产生精细的结构细节，例如脂质结构、片段密度剖面和结构域结构。扫描探针显微镜能够分辨固体表面上的吸附质结构，这对多两性电解质来说是最有趣的，因为多两性电解质的电荷密度可以随着ph值的变化而变化。结果只能部分地用理论解释。意想不到的和尚未解释的发现是聚电解质和界面的吸引相互作用以及影响动力学和微相分离的远程相互作用。然而，它们可以被用作控制界面属性和结构的主要手段。
Lipid and polyampholyte monolayers are shown to constitute interesting models for study of electrostatic and steric interactions of polyelectrolytes at interfaces. Measurements with Langmuir monolayers at the air/water interface yield access to the energetics and kinetics of adsorption processes. Newly developed types of optical microscopy, X-ray diffraction, and reflection techniques yield fine structural details, for example lipid structure, segment density profiles, and domain structure. Scanning probe microscopy enables resolution of adsorbate structure on solid surfaces which proves to be most interesting for polyampholytes, for which the charge density can be varied via pH. The results can only partly be explained by theory. Unexpected and not yet explained findings are attractive interactions of polyelectrolytes and interfaces and long-range interactions affecting kinetics and micro phase separations. They can, however, be used as a primary means of controlling interface properties and structure.