Ballistic energy transport in molecules

分子中的弹道能量传输

• 批准号: 1462075
• 负责人: Igor Rubtsov
• 金额: $ 42.2万
• 依托单位: Tulane University
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2015
• 资助国家: 美国
• 起止时间: 2015-08-01 至 2018-07-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=1462075&HistoricalAwards=false
• 关键词: Ballistic; energy; transport; molecules

With this award, the Chemical Structure, Dynamics and Mechanisms (CSDM-A) Program in the Division of Chemistry is funding Professors Igor Rubtsov and Alexander Burin of Tulane University to investigate unusually rapid movement of energy in molecules, so-called "ballistic energy transport." Most often energy (as heat) is transported slowly through materials as thermal diffusion. Professor Rubtsov's research group has discovered systems where energy deposited in long molecules is rapidly transferred to distant locations. This anomalous transfer of energy may help scientists discover new materials with improved thermal properties. The graduate and undergraduate students working on this project will receive training in laser and optical science. The PI and co-PI participate in a number of educational activities on their campus, including the Tulane LSAMP Summer Undergraduate Research Training Program, which provides undergraduates students from groups underrepresented in science with authentic research experiences.Professors Igor Rubtsov and Alexander Burin and their respective research groups will combine ultrafast laser spectroscopy (relaxation-assisted two-dimensional infrared spectroscopy) combined with theoretical modeling to develop a better understanding of how the very rapid energy transport over molecularly-significant distances occurs. Some of the questions that these scientists hope to answer include: (1) What are the main factors determining the speed and efficiency of ballistic transport? How does temperature effect the speed of ballistic transport? How does the three dimensional structure of a material effect the speed of ballistic transport? Among the factors affecting transport to be examined are the primary and secondary chain structure, chain architecture, the nature and energy of the source vibrational mode, and the temperature. These studies will help to establish the most likely transport mechanisms and,as such, will likely suggest ways of reducing losses for ballistic energy transport. The ballistic transport mechanism may have to be considered as a principal component of energy transport in molecules, especially for molecules featuring functional groups with repeating units, which are very common. Thus, this study has the potential of developing new ways of understanding vibrational energy transport in molecules at a very fundamental level and may have a broad impact on physical and materials science and engineering.

有了这个奖项，化学系的化学结构，动力学和机制（CSDM-A）计划正在资助杜兰大学的Igor Rubtsov和亚历山大布林教授研究分子中异常快速的能量运动，即所谓的“弹道能量传输”。“大多数情况下，能量（如热量）通过材料以热扩散的方式缓慢传输。 Rubtsov教授的研究小组已经发现了一种系统，在这种系统中，长分子中储存的能量被迅速转移到遥远的地方。 这种异常的能量转移可能有助于科学家发现具有改进的热性能的新材料。 从事该项目的研究生和本科生将接受激光和光学科学方面的培训。 PI和co-PI在校园内参加了许多教育活动，包括杜兰LSAMP夏季本科研究培训计划，该项目为来自科学界代表性不足的群体的本科生提供真实的研究经验。Igor Rubtsov和亚历山大布林教授及其各自的研究小组将联合收割机与超快激光光谱学相结合，（弛豫辅助二维红外光谱）结合理论建模，以更好地理解分子重要距离上的快速能量传输是如何发生的。 这些科学家希望回答的一些问题包括：（1）决定弹道运输速度和效率的主要因素是什么？ 温度如何影响弹道输运速度？ 材料的三维结构如何影响弹道传输的速度？在影响运输的因素中，要检查的是初级和次级链结构，链结构，源振动模式的性质和能量，以及温度。这些研究将有助于确定最可能的传输机制，因此，可能会提出减少弹道能量传输损失的方法。 弹道传输机制可能必须被认为是分子中能量传输的主要组成部分，特别是对于具有重复单元的官能团的分子，这是非常常见的。因此，这项研究有可能在非常基础的水平上开发理解分子振动能量传输的新方法，并可能对物理和材料科学与工程产生广泛的影响。