CAREER: Measurements, understanding, and control of interfacial thermal transport and recruiting young minorities to science and engineering

国家科学基金会摘要提案编号：CTS-0547122主要研究者： 斯科特·T HuxtableAffiliation： 弗吉尼亚理工学院州立大学提案标题：职业生涯：测量，理解和控制界面热传输和招募年轻的少数民族科学和工程& 这个CAREER奖建议实验研究纳米级的热传输通过固-固和固-液界面。 PI将利用非接触式皮秒光学技术，同时测量纳米级的热导率和界面热导率。 实验工作将在具有各种表面化学性质的固-液界面以及在大气压和高压下的固-固和固-液界面上进行。 在智力方面，拟议工作的主要研究目标是提高我们对控制固-固和固-液界面热导的物理学的理解。 这将通过以下方式实现：（1）检查表面化学，例如疏水和亲水单层，在界面热导中所起的作用，（2）探索官能团在振动刚性固体材料与软液体和聚合物之间热桥接的潜在用途，（3）在声子模式和界面耦合改变的高压下界面热导和热导率的实验观察，（4）液态金属与非金属界面上的电子-声子耦合的分离，以及与固态金属与非金属界面上可能的声子-声子耦合的比较。 这项工作的结果将是一个更完整的了解机制，负责不同材料之间的热流，这将导致：改进设计的热电和微波器件具有高效率，更好的热管理的电力电子和微功率系统，以及更好地控制复合材料中的传热。该项目的构想是强调工作对不同人群的广泛影响。 每年PI都会从纽约州尤蒂卡的低收入学校带来两名有风险但有前途的少数民族高中生到他的实验室进行一个夏天的研究和学习。 PI还将开发一门新的纳米工程课程，其中部分将包括从拟议的技术工作中获得的结果，但将广泛涵盖与传统机械工程研究主题相关的纳米科学/技术领域。

National Science FoundationABSTRACTProposal Number: CTS-0547122Principal Investigator: Scott T. HuxtableAffiliation: Virginia Polytechnic Institute & State University Proposal Title: CAREER: Measurements, Understanding, and Control of Interfacial Thermal Transport and Recruiting Young Minorities to Science and Engineering This CAREER Award proposes to experimentally investigate nanoscale thermal transport across solid-solid and solid-liquid interfaces. The PI will utilize non-contact picosecond optical techniques to simultaneously measure thermal conductivity and interface thermal conductance at the nanoscale. Experimental work will be conducted on solid-liquid interfaces with various surface chemistries and solid-solid and solid-liquid interfaces at atmospheric and elevated pressures. With respect to Intellectual Merit, the main research objective of the proposed work is to enhance our understanding of the physics that control thermal conductance across solid-solid and solid-liquid interfaces. This will be accomplished by: (1) examining the role that surface chemistry, e.g. hydrophobic and hydrophilic monolayers, plays in interface thermal conductance, (2) exploration of the potential use of functional groups to thermally bridge between vibrationally stiff solid materials and soft liquids and polymers, (3) experimental observations of interface thermal conductance and thermal conductivity at elevated pressure where phonon modes and interface coupling are altered, and (4) isolation of electron-phonon coupling at interfaces between liquid metals and non-metals, and comparison with possible phonon-phonon coupling at interfaces between solid metals and non-metals. The outcome of this work will be a more complete understanding of the mechanisms responsible for heat flow between dissimilar materials which will result in: the improved design of thermoelectric and thermionic devices with high efficiency, better thermal management of power electronics and micro power systems, and better control of heat transfer in composite materials. The project is conceived in such a way as to emphasize the broader impacts of the work to a diverse group of people. Each year the PI will bring two at-risk, yet promising, minority high school students from low-income schools in Utica, NY to his lab for a summer of research and learning. The PI also will develop a new course on Nanoengineering which will partially include results obtained from the proposed technical work, but will broadly cover areas of nanoscience/technology that are related to traditional mechanical engineering topics of study.