Ultrafast Mechanics of Molecular Liquids and Solids: Vibrational and Structural Relaxation

分子液体和固体的超快力学：振动和结构松弛

• 批准号: 0096466
• 负责人: Dana Dlott
• 金额: $ 48万
• 依托单位: University of Illinois at Urbana-Champaign
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 2001
• 资助国家: 美国
• 起止时间: 2001-04-01 至 2004-09-30
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0096466&HistoricalAwards=false
• 关键词: Ultrafast; Mechanics; Molecular; Liquids; Solids

This project aims to understand the mechanical dynamics of molecular liquids and solids at a fundamental level. The largest of two distinct but related thrusts involves the development and use of a new technique termed three dimensional (3D) Infrared-Raman spectroscopy. With three dimensional Infrared-Raman spectroscopy it is possible to study how vibrational energy flows through molecules, and how liquid state structures evolve in time. Important liquids such as water and methanol at room temperature will be studied to improve the laser apparatus and advance a theoretical understanding of 3D spectroscopy. A low temperature apparatus is being developed to study temperature dependence of these liquids and cryogenic solids. The smaller thrust involves the development and use of a shock wave spectroscopy technique to study supercooled liquids such as glasses and polymers which have slow structural relaxation dynamics. This technique is also referred to as the nanoshock technique. It produces large amplitude structural distortions in materials and then uses vibrational spectroscopy to monitor structural evolution back toward the original structure.This project involves the development of new instrumentation to study phenomena such as energy flow and how structures evolve in complex systems such as proteins and polymers. The relevance of this project to topics such as the accelerated aging of structural and biological materials is high, and students trained in these areas should be very competitive in the job market in areas of materials and biosciences of high interest to industry.

该项目旨在了解分子液体和固体的机械动力学的基础水平。最大的两个不同的，但相关的推力涉及开发和使用一种新的技术，称为三维（3D）拉曼光谱。利用三维拉曼光谱，可以研究振动能量如何流过分子，以及液态结构如何随时间演变。重要的液体，如水和甲醇在室温下将进行研究，以改善激光设备和推进三维光谱的理论理解。正在开发一种低温装置，以研究这些液体和低温固体的温度依赖性。较小的推力涉及开发和使用冲击波光谱技术来研究过冷液体，如玻璃和聚合物，它们具有缓慢的结构弛豫动力学。这种技术也被称为纳米冲击技术。它在材料中产生大幅度的结构扭曲，然后使用振动光谱来监测结构向原始结构的演变。该项目涉及开发新仪器，以研究能量流等现象以及蛋白质和聚合物等复杂系统中结构如何演变。该项目与结构和生物材料加速老化等主题的相关性很高，在这些领域接受培训的学生在工业界高度关注的材料和生物科学领域的就业市场上应该非常具有竞争力。