Experimental Study of Dynamics in Confined Environments

Hartland得到了实验物理化学计划的支持，研究密闭系统中的超快动力学。将执行与这一中心主题有关的三个项目。在第一个项目中，将研究纳米尺寸的金和银粒子中电子-电子和电子-声子耦合对粒子尺寸的依赖。这些研究旨在确定这些过程的时间常数如何随颗粒大小而变化。接下来，将通过激光泵浦探针技术检测氧化钛半导体颗粒中捕获电子的动力学，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依赖于反胶束中水池大小。在这个项目中研究的金和银纳米粒子构成了纳米级电子设备的基石，可能会提供下一代微电子电路。了解它们的尺寸依赖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，将提高对生物系统中的水袋的理解。

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.