MRI: Development of NSTAP: Nanoscale Thermal Anemometry Probe

ABSTRACTProposal没有。主要研究人员：A.J. Smits，普林斯顿大学该资助用于开发纳米级热风速测量探针（NSTAP），该探针能够在空间和时间尺度上测量流体流动，比目前使用现有仪器研究的流体流动要小两个数量级。通过对金属纳米线的基本机械和电子特性的理解，本研究将使悬浮在两个载流触点之间的独立纳米线的生产成为可能。纳米线，形成NSTAP的传感元件，将能够测量高雷诺数实验室流动中的微尺度湍流，这是目前由于缺乏可用的测量技术而无法实现的。此外，与传统探针相比，金属纳米线的表面积与体积比的增加将使器件不仅具有更高的分辨率，而且对变化的流量的响应也更加敏感和快速。尽管NSTAP的工作原理与现有成功的热风速测量方法相同，但由于纳米线的极小规模和高频响应，需要使用非常规仪器来校准和获取探头的数据。NSTAP将提供一些关于湍流的最基本和最基本问题的答案。成功制造NSTAP的第二个好处是能够跨越流体力学的典型边界，研究用于片上互连的金属纳米线的机械和电子特性。独立金属纳米线的发展将使研究诸如电迁移、再结晶和固有应力演变等效应成为可能，这些效应是由导线中的电流引起的，而与衬底引起的影响无关。这项工作的成功将对流体力学、材料科学和电气工程的研究人员产生更广泛的影响，并将从根本上影响纳米线在传感应用中的应用。该项目将极大地受益于流体力学和材料科学领域的各种学生和教师研究人员之间的密切合作，使这两种类型的专家能够了解对方的领域。通过使用标准纳米制造技术的学期项目和暑期研究经验，NSTAP的发展将很容易为本科生参与。NSTAP的实施将通过纳米制造和湍流测量的不同实践来教育学生。最后，获得的结果将广泛传播，以吸引研究人员和工业合作，进一步实施NSTAP在基础流体力学研究中的应用。

ABSTRACTProposal No. CTS-0421147Principal Investigator: A.J. Smits, Princeton UniversityThis grant is for the development of a nanoscale thermal anemometry probe (NSTAP) capable of measuring fluid flow on spatial and temporal scales two orders of magnitude smaller than can currently be studied with existing instrumentation is proposed. Through an understanding of the fundamental mechanical and electronic properties of metallic nanowires, this research will enable the production of a free standing nanowire suspended between two current carrying contacts. The nanowire, forming the sensing element of the NSTAP, will be capable of measuring microscale turbulence in high Reynolds number laboratory flows that is currently inaccessible due to lack of available measurement techniques. Furthermore, the increased surface area to volume ratio of the metallic nanowire in comparison to conventional probes will yield a device that not only has higher resolving power, but also is more sensitive and rapid in its response to changing flows. Although the operating principle of the NSTAP is identical to that of successful existing thermal anemometry practices, unconventional instrumentation is necessary to calibrate and acquire data from the probe due to the extremely small scale and high frequency response of the nanowire. The NSTAP will provide answers to some of the most basic and fundamental questions regarding turbulence. A secondary benefit that arises from the successful fabrication of the NSTAP is the ability to reach out across the typical boundaries of fluid mechanics to study mechanical and electronic properties metallic nanowires for on-chip interconnects. The development of free-standing metallic nanowires will enable the study of effects such as electromigration, recrystallization, and intrinsic stress evolution that occur due to current flow in the wire, independent of effects caused by the substrate. The success of this work will have broader implications for researchers in fluid mechanics, materials science and electrical engineering, and will fundamentally affect the use of nanowires for sensing applications. This project will greatly benefit from close collaborations among a diverse blend of student and faculty researchers in fluid mechanics and materials science enabling both types of specialists to learn about the other's field. The NSTAP development will be readily accessible for undergraduate participation through term projects and summer research experience in the use of standard nanofabrication techniques. The implementation of the NSTAP will educate students through the disparate practices of both nanofabrication and turbulence measurements. Finally, the results obtained will be broadly disseminated to attract researchers and industrial collaborations to further the implementation of the NSTAP in fundamental fluid mechanics research.