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.

在这个项目中，由化学部门的化学结构，动力学和机制计划资助，波士顿大学的劳伦斯·D·齐格勒教授将进行一系列实验，使用超级激光光谱方法，以了解允许超临界流体（SCF）与正常液体相比的特殊特性。 这些研究旨在揭示数百人秒至数百秒钟的时间尺度上的动作如何说明这种非凡的溶剂化能力。 将采用合并的实验和计算方法，以与波士顿大学的几位理论家合作实现这些目标。 研究生和本科生将参加这项研究，并将接受最新方法的培训。 此外，将鼓励妓女的参与者，NSF赞助的计划，旨在增强当地社区大学生的研究机会，以及NSF RET（教师研究经验）计划以及韦尔斯利女子学院的学生，将鼓励在该奖项的夏季参加这些研究。超临界流体被高度压缩，以至于既不是气体也不是液体。 SCF具有独特的气体和液体特性组合。许多研究人员正在探索使用SCF来替代传统溶剂的方法，这些溶剂可能是有毒，易燃或难以清除的，因为它们是因为它们像液体一样溶解了混合物，但很容易更换密度，因此可以更容易地去除或处理。 Ziegler教授的研究将帮助科学家了解赋予SCF这些异常特性的原因，以便可以在更广泛的应用中更有效地使用它们。