Fundamental New Experiments on Molecular Diffusion in Complex Solutions: Amplitude-Calibrated Forced Rayleigh Scattering

复杂溶液中分子扩散的基本新实验：振幅校准的受迫瑞利散射

• 批准号: 9711426
• 负责人: Daniel Spiegel
• 金额: $ 10.66万
• 依托单位: Trinity University
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 1997
• 资助国家: 美国
• 起止时间: 1997-09-01 至 2001-08-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9711426&HistoricalAwards=false
• 关键词: Fundamental; New; Experiments; Molecular; Diffusion

In this RUI project supported by the Experimental Physical Chemistry Program of the Chemistry Division, Spiegel will utilize amplitude-calibrated forced Rayleigh scattering (AC-FRS) to investigate small-molecule diffusion in polymer solutions. This method will be used to measure photoproduct and ground-state probe diffusion in order to develop in-situ optical control of molecular diffusion through polymer solutions and solids, including nonlinear-optical polymer waveguides. Initial experiments will examine photoinduced changes in the diffusion coefficients of azobenzenes and spiropyrans within polar-pendant group polymers. The diffusion of uncharged molecules across microscopic lengths through complex solutions such as polymers is a commonly occurring process in chemistry, chemical engineering, and biology. Nonetheless, there are many fundamental physical issues which have not been addressed. This project will look at some of the interactions which are important in understanding how to use light to control the rates of diffusion of neutral particles in polymer solids and solutions. This type of phenomenon has implications for high-speed nonlinear fiber optics technology.

在这个由化学部实验物理化学项目支持的 RUI 项目中，Spiegel 将利用振幅校准的受迫瑞利散射 (AC-FRS) 来研究聚合物溶液中的小分子扩散。 该方法将用于测量光产物和基态探针扩散，以开发通过聚合物溶液和固体（包括非线性光学聚合物波导）的分子扩散的原位光学控制。 初步实验将检查极性侧基聚合物中偶氮苯和螺吡喃扩散系数的光诱导变化。 不带电分子通过聚合物等复杂溶液在微观长度上的扩散是化学、化学工程和生物学中常见的过程。 尽管如此，仍有许多基本的物理问题尚未得到解决。 该项目将研究一些相互作用，这对于理解如何使用光来控制聚合物固体和溶液中中性粒子的扩散速率非常重要。 这种现象对高速非线性光纤技术具有重要意义。