Ultrafast dynamics of supercritical fluid solutions

超临界流体溶液的超快动力学

• 批准号: 1152797
• 负责人: Lawrence Ziegler
• 金额: $ 44.78万
• 依托单位: Trustees of Boston University
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 2012
• 资助国家: 美国
• 起止时间: 2012-07-15 至 2016-06-30
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=1152797&HistoricalAwards=false
• 关键词: Ultrafast; dynamics; supercritical; fluid; solutions

In this project, funded by the Chemical Structure, Dynamics and Mechanisms Program of the Chemistry Division, Professor Lawrence D. Ziegler of Boston University will conduct a series of experiments that use ultrafast laser spectroscopic methods to learn about the special properties that allow supercritical fluids (SCFs) to be such effective solvents, as compared to normal liquids. These studies are designed to reveal how motions on the time scale of hundreds of femtoseconds to hundreds of picoseconds account for this extraordinary solvation ability. A combined experimental and computational approach will be carried out to accomplish these goals in collaboration with several theorists at Boston University. Graduate and undergraduate students will participate in this research, and will be trained in state-of the-art methods. In addition, participants in PROSTARS, an NSF sponsored program to enhance research opportunities for local community college students, and in the NSF RET (Research Experience for Teachers) program, as well as students in the women's college of Wellesley, will be encouraged to participate in these studies during the summer months of this award. A supercritical fluid is so highly compressed that it is neither a gas nor a liquid. SCFs have unique and useful combinations of gas and liquid properties. Many investigators are exploring ways to use SCFs to replace traditional solvents, which can be toxic, flammable or difficult to remove, because they because they dissolve mixtures well as if they are liquids, but have easily changed densities and thus can be more easily removed or processed. Prof. Ziegler's research will help scientists understand what gives SCFs these unusual properties so that they can be used more effectively and in a wider range of applications.

在这个由化学系化学结构、动力学和机理计划资助的项目中，波士顿大学的Lawrence D.Ziegler教授将进行一系列实验，使用超快激光光谱方法来了解与普通液体相比，超临界流体(SCF)具有如此有效的溶剂的特殊性质。这些研究旨在揭示数百飞秒到数百皮秒的时间尺度上的运动如何解释这种非凡的溶剂化能力。将与波士顿大学的几位理论家合作，采用实验和计算相结合的方法来实现这些目标。研究生和本科生将参与这项研究，并将接受最先进的方法培训。此外，NSF赞助的ProStars项目旨在为当地社区大学生增加研究机会，NSF RET(教师研究体验)项目的参与者以及卫尔斯理女子学院的学生将被鼓励在该奖项的夏季月份参与这些研究。超临界流体是高度压缩的，既不是气体，也不是液体。超临界流体具有独特且有用的气体和液体特性组合。许多研究人员正在探索使用超临界流体来取代传统溶剂的方法，传统溶剂可能有毒、易燃或难以去除，因为它们像溶解液体一样很好地溶解混合物，但密度很容易改变，因此更容易去除或处理。齐格勒教授的研究将帮助科学家了解是什么赋予了超临界纤维这些不同寻常的特性，以便更有效地利用它们，并在更广泛的应用中应用。