Dynamics of Molecules in Complex Molecular Materials

复杂分子材料中的分子动力学

• 批准号: 0088942
• 负责人: Michael Fayer
• 金额: $ 59.4万
• 依托单位: Stanford University
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 2000
• 资助国家: 美国
• 起止时间: 2000-06-01 至 2003-12-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0088942&HistoricalAwards=false
• 关键词: Dynamics; Molecules; Complex; Molecular; Materials

The aim of this project is to investigate the dynamics and intermolecular interactions in complex condensed matter molecular systems. A wide variety of materials will be studied, including glasses, supercooled liquids, liquid crystals, hydrogen bonded clusters, micelles, reverse micelles, polymers, and polymer micelles. Cynamics in complex molecular systems can span a wide range of time scales. Therefore, the experiments ae directed toward observations over a sufficiently wide range of times to provide a detailed picture of the dynamics. Ultrafast infrared vibrational echo experiments combined with infrared pump-probe experiments will be used to study vibrational dynamics which reflect the dynamics of the medium in which the vibrational oscillator is embedded and the nature of the intermolecular interactions that couple dephasing dynamics to be extracted from systems that are inhomogeneous, and, therefore, cannot be studied with convention linear spectroscopy. The vibrational echo studies will be extended to include other vibrational coherence experiments including stimulated vibrational echoes and various types of two dimensional vibrational echo experiments. Stimulated vibrational echoes will provide information on longer time scale dynamics, i.e., vibrational spectral diffusion. The first tow-dimensional vibrational echo experiments, Vibrational Echo Spectroscopy, was demonstrated in the previous grant period. This technique, which provides a method for the suppression of unwanted background absorptions in a vibrational spectrum, will be developed further. Two time 2D experiments that probe the coupling between different mechanical degrees of freedom will also be developed. Vibrational echo experiments, and the related non-linear vibrational coherence experiments, will be used to study dynamics in high temperature glass, supercooled liquids, water in the core of reverse micelles, hydrogen bonded clusters of water and alcohols in solvents, pure liquids, and proteins. Transient grating optical Kerr effect experiments, heterodyne amplified optical Kerr effect experiments, and a new method, density induced heterodyne amplified rotational dynamics, will be applied to the study of dynamics in complex molecular systems over vast ranges of time, from tens of femtoseconds to milliseconds and longer, Work during the current grant period has shown that a combination of these techniques, which provide tremendous dynamic range in signal and time, can provide fundamentally new information about the nature of complex systems. The techniques will be applied to supercooled liquids, micelles, polymer micelles, polymers, and liquids crystals.The emphasis in this study is on complex condensed matter systems such as supercooled liquids, micelles, polymer micelles, polymers, and liquids crystals and on the optimization of materials processing for applications such as optical flat panel desplay devices and structural materials.

本项目的目的是研究复杂凝聚态分子系统的动力学和分子间相互作用。 将研究各种各样的材料，包括玻璃，过冷液体，液晶，氢键团簇，胶束，反胶束，聚合物和聚合物胶束。 复杂分子系统中的动力学可以跨越很宽的时间尺度。 因此，实验是针对在足够宽的时间范围内进行观测，以提供详细的动态图像。 超快红外振动回波实验与红外泵浦探测实验相结合，将用于研究振动动力学，它反映了振动振荡器嵌入其中的介质的动力学，以及从非均匀系统中提取的耦合退相动力学的分子间相互作用的性质，因此，不能用常规线性光谱学进行研究。 振动回波研究将扩展到包括其他振动相干实验，包括受激振动回波和各种类型的二维振动回波实验。 受激振动回波将提供关于较长时间尺度动力学的信息，即，振动光谱扩散 第一个二维振动回波实验，振动回波光谱学，是在前一个资助期。 这种技术提供了一种抑制振动光谱中不需要的背景干扰的方法，将得到进一步发展。 还将开发两个时间2D实验，探测不同机械自由度之间的耦合。 振动回波实验和相关的非线性振动相干实验将用于研究高温玻璃、过冷液体、反胶束核心中的水、溶剂中的水和醇的氢键簇、纯液体和蛋白质中的动力学。 瞬态光栅光学克尔效应实验，外差放大光学克尔效应实验，以及一种新的方法，密度诱导外差放大旋转动力学，将被应用于研究复杂分子系统在从几十飞秒到毫秒甚至更长的时间范围内的动力学。其在信号和时间上提供了巨大的动态范围，可以提供关于复杂系统的本质的全新信息。 该技术将应用于过冷液体，胶束，聚合物胶束，聚合物和液晶，在这项研究中的重点是复杂的凝聚态物质系统，如过冷液体，胶束，聚合物胶束，聚合物和液晶和优化材料加工的应用，如光学平板显示设备和结构材料。