Correlated Time-Resolved Spectroscopy and Structural Studies of Single Metal Particles

在这个由化学系实验物理化学计划资助的奖项中，圣母大学的Gregory V.哈特兰教授及其研究生和本科生同事将研究单个金属纳米颗粒的动力学和物理性质。 单个纳米颗粒将用TEM表征，随后用瞬态吸收测量进行分析。 实验结果将与模型连续介质力学模拟的结果进行比较。 各种各样的纳米粒子将被研究，包括立方体银粒子，金银纳米盒，纳米棒，纳米条形码和纳米线。 这些研究的目的是更多地了解颗粒尺寸、结构和形态如何影响材料性能。纳米颗粒越来越多地用于许多应用中，但仍有许多未知。 这些研究希望阐明激发后的弛豫速率和界面热传导速率等物理性质如何取决于颗粒的大小和形状。 这些类型的信息是相关的，如果金属纳米粒子在光热疗法中找到用途，也应该广泛适用于更好地理解纳米流体中的热传递的发展。 除了这项研究的更广泛的技术影响外，哈特兰教授的学生还将接受材料科学，物理和化学方面的尖端跨学科培训。 哈特兰教授计划将他的研究成果转化为他所教授的大一化学课程的教材。

In this award, funded by the Experimental Physical Chemistry Program of the Chemistry Division, Prof. Gregory V. Hartland of the University of Notre Dame and his graduate and undergraduate student colleagues will study the dynamics and physical properties of single metal nanoparticles. Individual nanoparticles will be characterized with TEM, and subsequently analyzed with transient absorption measurements. Experimental results will be compared with the results of model continuum mechanics simulations. A wide variety of nanoparticles will be studied including cubic Ag particles, Au-Ag nanoboxes, nanorods, nanobarcodes and nanowires. The goal of these studies is to learn more about how particle size, structure and morphology influence material properties. Nanoparticles are increasingly being used in many applications, yet much remains unknown. These studies hope to shed light on how physical properties like the rate of relaxation following excitation and the rate of interfacial heat conduction depend upon the size and shape of the particle. These types of information are relevant if metal nanoparticles find use in photothermal therapy, and should also be broadly applicable to a development of a better understanding of heat transfer in nanofluids. Besides the broader technological impact of this research, Prof. Hartland's students will receive cutting edge interdisciplinary training in materials science, physics and chemistry. Prof. Hartland has plans for developing the results of his research work into curricular materials for the Freshman chemistry course that he teaches.