In-Situ Optical Monitoring for Langmuir/Blodgett Deposition

有机会创建设计和制造协议， 工程聚合物薄膜系统（PUFS）的产生可以 我们将依赖于先进的原位诊断技术的发展。 Langmuir/Blodgett沉积技术提供了以下可能性： 为有机物应用于重要的 新兴领域，如光学计算，电子学， 生物技术. 这些应用依赖于精确控制 材料属性，如位置和取向顺序， 活性部分、层的交替和厚度。 随着研究聚合物的混合物和化合物的需要， 以形成具有三维结构的膜系统 为了，很明显，方法需要开发能力 追踪弹性动力学、流体动力学和电动力学 单分子层从空气/水中提取时的行为 接口. 在本项目中，建议将激光束引入 接触线，以及在上部和下部静止位置。 二次谐波产生（SHG），这似乎是一个非常有前途的 探针，在这里用来研究分子的取向， 朗缪尔层，以及表征完成膜的顺序 光学高度非线性染料系统。 通过比较来自 朗缪尔层与水接触线上获得的 然后在上部静止（干燥）位置，PI 能够测量染料部分的重新取向， 极化旋转，通过振幅改变面积/分子 变化，化学降解和干燥，通过检查这些相同的 对不同分子和底物的影响。 在该初始 努力，PI的计划，试图确认这些测量是 可能的，并且动态发生在时间尺度上， 这证实了进一步研究的必要性。 如果这样 动态变化是明显的，精确的监测可以允许 精细调节槽条件以改善薄膜 质量. 这些测量将提供有价值的信息 目前还没有关于之间的区别 早期单层和后续层的行为。 光学返回信号将有助于建立 朗缪尔层在转变过程中的过渡历史 变成一个特定的单层沉积物。 如果这项工作取得成功，它将为其他国家开辟道路。 光学和红外光谱能够检测细微的 在液体薄膜中构象和键合的变化。

The opportunity to create design and manufacturing protocols for the creation of engineered polymeric ultrathin film systems (PUFS) may well rest on the development of sophisticated, in-situ diagnostics. The Langmuir/Blodgett deposition technique offers the possibility of providing the foundation for the application of organics to important emerging fields, such as optical computing, electronics, and biotechnology. These applications depend on precise control of materials properties such as positional and orientational order of active moieties, alternation of layers, and thickness. With the need to investigate mixtures and compounds of polymers being deposited in order to create film systems possessing three-dimensional order, it has become evident that methods need to be developed capable of tracking the elastodynamic, hydrodynamic, and electrodynamic behavior of the monolayers as they are extracted from the air/water interface. It is proposed in this project to introduce laser beams at the contact line, as well as at the upper and lower resting positions. Second harmonic generation (SHG), which appears to be a very promising probe, is used here to study the orientation of molecules on the Langmuir layer, as well as to characterize the order of completed film systems of optically highly nonlinear dyes. By comparing the SHG from the Langmuir layer with that obtained at the water contact line on the substrate, and later at the upper resting (drying) position, the PI's are able to measure reorientation of the dye moiety through polarization rotation, changes in area/molecule through amplitude changes, and chemical degradation and drying by examining these same effects on different molecules and substrates. In this initial effort, the PI's plan to attempt to confirm that such measurements are possible, and that dynamics are occurring during time scales which validate the need to pursue further study. If such dynamical changes are evident, accurate monitoring may allow delicate adjustment of trough conditions for improved film quality. These measurements will provide valuable information not presently available concerning the distinctions between the behavior of the early monolayers and that of subsequent layers. The optical return signal will aid in establishing the transitional history of the Langmuir layer as it is transformed into a specific deposited monolayer. If this work is successful, it will open the way to additional optical and infrared spectroscopies capable of detecting subtle changes in conformation and bonding in thin liquid films.