Experimental Study of Dynamics in Confined Environments

密闭环境动力学实验研究

• 批准号: 9816164
• 负责人: Gregory Hartland
• 金额: $ 28.13万
• 依托单位: University of Notre Dame
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 1999
• 资助国家: 美国
• 起止时间: 1999-02-01 至 2003-01-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9816164&HistoricalAwards=false
• 关键词: Experimental; Study; Dynamics; Confined; Environments

Hartland is supported by the Experimental Physical Chemistry Program to examine ultrafast dynamics in confined systems. Three projects that relate to this central theme will be carried out. In the first project, the particle size dependence to electron-electron and electron-phonon coupling in nanometer sized gold and silver particles will be investigated. These studies aim to determine how the time constants for these processes vary with a particle size. Next, the dynamics of trapped electrons in titanium oxide semiconductor particles will be examined via laser pump-probe techniques, to learn about the timescale for thermalization of hot electrons in the titanium dioxide conduction band. Finally, the solvation and non-adiabatic relaxation dynamics of electrons in reverse micelles will be studied, to determine directly how solvent motions depend on the water pool size in the reverse micelle. The gold and silver nanoparticles that will be studied in this project form the building blocks of nanoscale electronics devices that may provide the next generation of microelectronics circuits. Understanding their size-dependent behavior is an important consideration for the development of these devices. The studies of reverse micelles can provide insights that will improve the understanding of water pockets in biological systems.

哈特兰得到实验物理化学计划的支持，以研究受限系统中的超快动力学。 将开展与这一中心主题相关的三个项目。在第一个项目中，将研究纳米金和银颗粒中电子-电子和电子-声子耦合的颗粒尺寸依赖性。 这些研究旨在确定这些过程的时间常数如何随颗粒尺寸变化。接下来，将通过激光泵浦探针技术检查二氧化钛半导体颗粒中俘获电子的动力学，以了解二氧化钛导带中热电子热化的时间尺度。最后，将研究反胶束中电子的溶剂化和非绝热弛豫动力学，以直接确定溶剂运动如何取决于反胶束中的水池尺寸。该项目将研究的金和银纳米粒子构成了纳米级电子设备的构建模块，这些设备可以提供下一代微电子电路。 了解它们的尺寸依赖性行为是开发这些设备的重要考虑因素。反胶束的研究可以提供见解，从而提高对生物系统中水袋的理解。