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

国家科学基金会简介建议编号：CTS-0547122主要研究员：Scott T.Huxtable隶属关系：弗吉尼亚理工学院和州立大学提案标题：CAROR：界面热传输的测量、理解和控制并招募年轻的少数族裔进入科学和工程这项职业奖旨在实验研究固-固和固-液界面上的纳米级热传输。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。将在各种表面化学物质的固液界面以及常压和加压下的固-固和固-液界面上进行实验工作。就智力价值而言，拟议工作的主要研究目标是加强我们对控制固-固和固-液界面热导的物理学的理解。为此，将通过：(1)研究表面化学，如疏水性和亲水单分子层在界面热导中的作用，(2)探索官能团在振动硬固体材料和软液体与聚合物之间架设热桥的潜在用途，(3)对界面热导率和加压下的热导率以及声子模和界面耦合发生变化的情况进行实验观察，以及(4)隔离液态金属和非金属界面上的电子-声子耦合，并与固体金属和非金属界面上可能的声子-声子耦合进行比较。这项工作的结果将是对不同材料之间热流的机制有更全面的了解，这将导致：高效率的热电和热电子器件的改进设计，更好的电力电子和微电力系统的热管理，以及更好的复合材料中的热传递控制。该项目的构思方式是强调工作对不同群体的更广泛影响。每年，PI都会把两名来自纽约州尤蒂卡低收入学校的有风险但有前途的少数族裔高中生带到他的实验室进行一个夏天的研究和学习。该研究所还将开发一门新的纳米工程课程，该课程将部分包括拟议技术工作取得的成果，但将广泛涵盖与传统机械工程研究课题相关的纳米科学/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.