Experimental Study of Dynamics in Confined Environments

哈特兰得到了实验物理化学计划的支持，该计划旨在研究受限系统中的超快动力学。将开展与这一中心主题有关的三个项目。在第一个项目中，我们将研究纳米金银颗粒中电子-电子和电子-声子耦合对颗粒尺寸的依赖关系。这些研究旨在确定这些过程的时间常数如何随着颗粒大小的变化而变化。接下来，将通过激光泵浦-探测技术来研究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表。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的水池大小。本项目将研究的金和银纳米颗粒构成了纳米级电子设备的基础，可能提供下一代微电子电路。了解它们的尺寸相关行为是开发这些设备的重要考虑因素。对反胶束的研究可以提供对生物系统中水袋的理解的见解。

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.