| 项目编号: | 1707080
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| 项目名称: | Collaborative Research: Hydrodynamic Thermal Transport in Graphitic Materials |
| 作者: | Li Shi
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| 承担单位: | University of Texas at Austin
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| 批准年: | 2017
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| 开始日期: | 2017-08-15
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| 结束日期: | 2020-07-31
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| 资助金额: | 356416
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| 资助来源: | US-NSF
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| 项目类别: | Standard Grant
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| 国家: | US
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| 语种: | 英语
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| 特色学科分类: | Engineering - Chemical, Bioengineering, Environmental, and Transport Systems
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| 英文关键词: | graphitic material
; hydrodynamic phonon transport
; phonon transport
; research
; nanoscale thermal transport measurement
; energy transport
; thermal transport property
; unusual thermal transport behavior
; intrinsic thermal transport property
; research finding
; edge ultrafast thermal transport method
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| 英文摘要: | Graphitic materials exhibit some of the highest thermal conductivity values found in solids. This feature has resulted in existing and emerging applications of these materials for transferring heat and keeping operating devices cool. However, the actual mechanisms behind their high thermal conductivity are not well understood. Recent theoretical studies have suggested that frequent scattering among a peculiar group of high-population phonons in graphitic materials does not either cause resistance directly or limit their thermal conductivity contribution. This unusual phonon transport behavior has been referred as hydrodynamic phonon transport. Observation of hydrodynamic phonon transport has never been experimentally observed in any materials at a sufficiently high temperature that is relevant to technological applications. Hydrodynamic phonon transport can have practical implications in the design and thermal modeling of graphitic materials. Thus, a set of theoretically guided advanced experiments are conducted in this research to verify the existence of the unusual thermal transport behavior in graphitic materials. Also, the research findings and methods are integrated into three undergraduate and graduate courses and two demonstration modules for general public.
The objective of this research is to elucidate the influence of hydrodynamic phonon transport on the thermal transport properties of graphitic materials. This will be accomplished through theoretical and experimental efforts, including first principles based theoretical studies of phonon transport, nanoscale thermal transport measurements of the intrinsic thermal conductance, and ultrafast opto-thermal measurements of second sound in isotopically purified nanotube, graphene, and thin graphite samples. These theoretical and experimental efforts can further lead to a better understanding of the quantum theory of energy transport by lattice vibrations. If successful, the research can lead to a new approach to simulate phonon transport. In addition, it can advance the frontier of nanoscale thermal transport measurements by overcoming a critical challenge in probing the intrinsic thermal transport properties of nanostructures. Moreover, it can result in a cutting edge ultrafast thermal transport method for probing phonon transport. |
| 资源类型: | 项目
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| 标识符: | http://119.78.100.158/handle/2HF3EXSE/89316
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| Appears in Collections: | 全球变化的国际研究计划
科学计划与规划
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| Recommended Citation: | |
Li Shi. Collaborative Research: Hydrodynamic Thermal Transport in Graphitic Materials. 2017-01-01.
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