Research Initiation Awards: Characterization of Interdiffusion Between Layers of Langmuir-Blodgett Multilayers

研究启动奖：Langmuir-Blodgett 多层膜层间相互扩散的表征

• 批准号: 9110110
• 负责人: Mark Foster
• 金额: $ 6.97万
• 依托单位: University of Akron
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 1991
• 资助国家: 美国
• 起止时间: 1991-07-01 至 1993-12-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9110110&HistoricalAwards=false
• 关键词: Research; Initiation; Awards; Characterization; Interdiffusion

The objective of this program is a quantitative characterization of the degree of interdiffusion between layers of a Langmuir-Blodgett (LB) multilayer as well as an understanding of the interdiffusion mechanism and identification of important parameters. The study will focus on a model system containing two well characterized materials, cadmium arachidate (CdA) and a substituted polyglutamate (PG). The polyglutamate material has a demonstrated low mode loss when used as an optical medium, and the system is chosen to suggest certain characteristics of a potential organic optical device. Interdiffusion between CdA layers separated by a PG bilayer barrier will be followed using neutron reflectometry (NR) complemented with x-ray reflectometry (XR). Interface profiles before and after diffusion will be inferred by reconciling experimental reflectivities with simulated curves calculated using an established matrix formalism. Potential ambiguities in interpretation will be minimized by the combination of two complementary experimental probes, variation of contrast with deuteration, and the use of system components which are well characterized. The expected results will add greatly to the meager existing data on interdiffusion between two-dimensional ordered layers. New insight into the mechanism and controlling parameters of interdiffusion will potentially impact the design of molecular scale organic devices and the study of transport in model biological membranes. Specifically it will be shown if a novel liquid-crystalline-like polymer acts as an effective diffusion barrier.

该程序的目的是定量表征Langmuir-Blodgett （LB）多层膜层间的相互扩散程度，并了解相互扩散机制和识别重要参数。该研究将集中在包含两种表征良好的材料的模型系统上，即花生酯镉（CdA）和取代的聚谷氨酸（PG）。当用作光学介质时，聚谷氨酸材料具有低模式损耗，并且选择该系统是为了表明潜在的有机光学器件的某些特性。用中子反射仪（NR）和x射线反射仪（XR）跟踪由PG双层势垒隔开的CdA层之间的相互扩散。通过将实验反射率与使用已建立的矩阵形式计算的模拟曲线相协调，可以推断扩散前后的界面剖面。通过结合两个互补的实验探针、对比与氘化的变化、并且使用了具有良好特征的系统组件。预期的结果将大大补充现有的关于二维有序层间相互扩散的贫乏数据。对相互扩散机制和控制参数的新认识将潜在地影响分子尺度有机器件的设计和模型生物膜中运输的研究。具体来说，如果一种新型的类似液晶的聚合物作为一种有效的扩散屏障，它将被展示出来。