Heterogeneous Dynamics in Disordered Materials by Spectroscopy

通过光谱学研究无序材料的异质动力学

• 批准号: 0204065
• 负责人: Ranko Richert
• 金额: $ 28.99万
• 依托单位: Arizona State University
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2002
• 资助国家: 美国
• 起止时间: 2002-08-15 至 2006-07-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0204065&HistoricalAwards=false
• 关键词: Heterogeneous; Dynamics; Disordered; Materials; Spectroscopy

CHE-0204065PI: Richert, RankoIn this project, funded by the Experimental Physical Chemistry Program of the Chemistry Division, Richert will perform research using triplet state solvation dynamics to study relaxation and dynamical heterogeneity in glass-forming liquids. Experiments will be performed on probe rotation, polarization-angle-dependent detection of the solvation time correlation function, and heterogeneity on the microsecond to nanosecond time scales. A new technique developed by Richert allows the first simultaneous measurement of probe rotational dynamics and solvation dynamics. This project deals with the important topic of how supercooled liquids make a transition to the solid state of aggregation. Many previous experiments have pointed to the existence of heterogeneous regions in the otherwise homogeneous liquid, with the heterogeneous regions exhibiting different dynamical behaviors from the homogeneous ones. The principal investigator has invented a unique technique by means of which the properties of the heterogeneous regions can be obtained separately from the homogeneous ones in a single experiment. Great advances in the understanding of the liquid to glass transition are expected to result from this research, with potential applications to polymer science and plastic crystals. Students will participate in this research.

CHE-0204065PI：Richert，Ranko 在该项目中，由化学部实验物理化学项目资助，Richert 将利用三重态溶剂化动力学进行研究，以研究玻璃形成液体中的弛豫和动力学异质性。 实验将针对探针旋转、溶剂化时间相关函数的偏振角度相关检测以及微秒到纳秒时间尺度的异质性进行。 Richert 开发的新技术首次能够同时测量探针旋转动力学和溶剂化动力学。 该项目涉及过冷液体如何转变为固态聚集态的重要主题。 之前的许多实验都指出，在均质液体中存在异质区域，异质区域表现出与均质区域不同的动力学行为。 首席研究员发明了一种独特的技术，通过该技术可以在一次实验中分别获得异质区域和同质区域的属性。 这项研究预计将在对液体到玻璃化转变的理解方面取得巨大进展，并在聚合物科学和塑料晶体方面具有潜在的应用前景。 学生将参与这项研究。