Ballistic Energy Transport in Molecules

分子中的弹道能量传输

基本信息

批准号：
1900568
负责人：
Igor Rubtsov
金额：
$ 42万
依托单位：
Tulane University
依托单位国家：
美国
项目类别：
Standard Grant
财政年份：
2019
资助国家：
美国
起止时间：
2019-08-01 至 2023-02-28
项目状态：
已结题

来源：
https://www.nsf.gov/awardsearch/showAward?AWD_ID=1900568&HistoricalAwards=false
关键词：
Ballistic Energy Transport Molecules

项目摘要

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 through the random motion of electrons and atoms making up the material (this is called "thermal diffusion"). Professor Rubtsov's research group has discovered systems where energy deposited in long molecules is rapidly transferred to distant locations, not unlike a bullet or projectile. This anomalous transfer of energy may help scientists discover new materials with improved thermal transport properties. The graduate and undergraduate students working on this project are receiving training in optical science, laser spectroscopy and quantum theory. The PI and co-PI participate in a number of educational activities on their campus, including the Tulane Louis Stokes Louisiana Alliance for Minority Participation (LS-LAMP) Summer Undergraduate Research Training Program, which provides undergraduate students from groups underrepresented in science with authentic research experiences. Professors Igor Rubtsov and Alexander Burin and their respective research groups are combining ultrafast laser spectroscopy (relaxation-assisted two-dimensional infrared spectroscopy (2DIR)) 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: What are the main factors determining the speed of ballistic transport and how to increase its efficiency? How do the transport parameters, such as efficiency, speed, band selection, and cooling rate, depend on the environment and temperature? Can these transport parameters be controlled by external stimuli and how to design molecules for such control? Can the ballistic transport be efficient against the direction of thermal gradient? 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 are identifying the most likely transport mechanisms and, as such, will likely suggest ways of reducing losses for ballistic energy transport and directing energy to specific targets. The ballistic transport mechanism is considered as a principal component of energy transport in molecules, especially for molecules featuring functional groups with repeating units, which are very common. These studies are helping us understanding how to use the ballistic transport and how to manipulate its outcome. Establishing the fundamental principles needed to make the process either fast and efficient or slow and inefficient could impact a broad class of problems that take center stage in nanoscience and molecular electronics. In addition to the aforementioned training and outreach activities, this project includes the the designing of a novel undergraduate course that incorporates the knowledge obtained in the program and implements an experimental exercise on 2DIR spectroscopy.This award reflects NSF's statutory mission and has been deemed worthy of support through evaluation using the Foundation's intellectual merit and broader impacts review criteria.

凭借该奖项，化学系的化学结构、动力学和机制 (CSDM-A) 项目正在资助杜兰大学的 Igor Rubtsov 和 Alexander Burin 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）通过构成材料的电子和原子的随机运动在材料中缓慢传输（这称为“热扩散”）。鲁布佐夫教授的研究小组发现了一种系统，其中沉积在长分子中的能量可以快速转移到遥远的位置，就像子弹或射弹一样。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传输特性的新材料。从事该项目的研究生和本科生正在接受光学科学、激光光谱和量子理论方面的培训。 PI 和 co-PI 参加校园内的许多教育活动，包括杜兰路易斯斯托克斯路易斯安那州少数民族参与联盟 (LS-LAMP) 夏季本科生研究培训计划，该计划为来自科学领域代表性不足的群体的本科生提供真实的研究经验。 Igor Rubtsov 和 Alexander Burin 教授及其各自的研究小组正在将超快激光光谱（弛豫辅助二维红外光谱 (2DIR)）与理论模型相结合，以更好地理解分子级距离上非常快速的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：决定弹道传输速度的主要因素是什么以及如何提高其效率？传输参数（例如效率、速度、带选择和冷却速率）如何取决于环境和温度？这些运输参数可以通过外部刺激来控制吗？如何设计分子来进行这种控制？弹道输运能否在热梯度方向上有效？要检查的影响传输的因素包括初级和次级链结构、链结构、源振动模式的性质和能量以及温度。这些研究正在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并将能量引导至特定目标的方法。弹道输运机制被认为是分子中能量输运的主要组成部分，特别是对于具有重复单元的官能团的分子来说，这是非常常见的。这些研究正在帮助我们了解如何使用弹道运输以及如何操纵其结果。建立使该过程快速高效或缓慢低效所需的基本原则可能会影响纳米科学和分子电子学中占据中心地位的一系列广泛问题。除了上述培训和推广活动外，该项目还包括设计一门新颖的本科课程，该课程结合了该项目中获得的知识，并实施了 2DIR 光谱学的实验练习。该奖项反映了 NSF 的法定使命，并被认为是值得的通过使用基金会的智力优势和更广泛的影响审查标准进行评估来提供支持。

项目成果

期刊论文数量（8）

专著数量（0）

科研奖励数量（0）

会议论文数量（0）

专利数量（0）

Plasmonic Trimers for Dual-Frequency Surface-Enhanced Two-Dimensional Infrared Spectroscopy

用于双频表面增强二维红外光谱的等离子体三聚体

DOI：
10.1021/acs.jpcc.9b07045
发表时间：
2019
期刊：
The Journal of Physical Chemistry C
影响因子：
0
作者：
Mackin, Robert T.;Cohn, Bar;Engelman, Ben;Goldner, Adi;Rubtsov, Igor V.;Chuntonov, Lev
通讯作者：
Chuntonov, Lev

Low-Temperature Vibrational Energy Transport via PEG Chains

通过 PEG 链进行低温振动能量传输

DOI：
10.1021/acs.jpclett.0c01273
发表时间：
2020
期刊：
The Journal of Physical Chemistry Letters
影响因子：
0
作者：
Mackin, Robert T.;Leong, Tammy X.;Rubtsova, Natalia I.;Burin, Alexander L.;Rubtsov, Igor V.
通讯作者：
Rubtsov, Igor V.

How Intramolecular Vibrational Energy Transport Changes with Rigidity and Polarity of the Environment?