Collaborative Research: Nanoscale Heat Transfer and Phase Transformation Surrounding Intensely Heated Nanoparticles

合作研究：围绕强热纳米颗粒的纳米级传热和相变

• 批准号: 1033336
• 负责人: David Cahill
• 金额: $ 21.4万
• 依托单位: University of Illinois at Urbana-Champaign
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2010
• 资助国家: 美国
• 起止时间: 2010-08-01 至 2014-07-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=1033336&HistoricalAwards=false
• 关键词: Collaborative; Research; Nanoscale; Heat; Transfer

1033356CahillNanoscale objects, such as metal nanoparticles or carbon nanotubes, are prone to highly efficient absorption of electromagnetic radiation. When high intensity electromagnetic radiation is delivered to such objects, such as by a focused laser beam, the absorbed energy can lead to extreme local heating of and very large temperature increases in both the nanoscale objects and the surrounding medium. These highly localized thermal excursions correspond to heat fluxes that can be orders of magnitude larger than those sustained at the macroscale. Intellectual Merit: This research builds upon advances in (a) laser-based ultrafast optical techniques capable of capturing relevant phenomena at pico- to nanosecond time scales and (b) computational power and modeling techniques allowing simultaneous examination of such systems experimentally and theoretically at the same temporal and special scales. In particular, molecular dynamics simulations and time resolved pump-probe experiments will advance the understanding of heat transfer, phase transformation, and phase equilibria arising at the interface between the nanoscale solids and a surrounding liquid.Broader Impacts: The research focuses on the exchange of thermal energy between an intensely heated solid nanoparticles and a surrounding liquid. This has important implications for biomedical applications such as highly selective thermal therapy for cancer treatment. Graduate students engaged in the research will make contributions in heat transfer, materials science, soft-hard matter interactions, and phase equilibria. Undergraduate students will also be engaged in the research. Pertinent visual-learning and web-based tools will be developed to integrate the research and education activities.

纳米级物体，如金属纳米颗粒或碳纳米管，易于高效吸收电磁辐射。当高强度电磁辐射被传递到这样的物体时，例如通过聚焦激光束，吸收的能量可以导致纳米级物体和周围介质的极端局部加热和非常大的温度增加。这些高度局部化的热偏移对应于热通量，其可以是比宏观尺度下维持的热通量大的数量级。智力优势：这项研究建立在（a）激光为基础的超快光学技术，能够捕捉相关现象在皮科到纳秒的时间尺度和（B）计算能力和建模技术，允许同时检查这样的系统实验和理论上在相同的时间和特殊的尺度。特别是，分子动力学模拟和时间分辨泵探测实验将推进对纳米级固体和周围液体之间界面处产生的热传递、相变和相平衡的理解。更广泛的影响：研究重点是强烈加热的固体纳米颗粒和周围液体之间的热能交换。这对生物医学应用具有重要意义，例如用于癌症治疗的高选择性热疗法。 从事研究的研究生将在传热，材料科学，软硬物质相互作用和相平衡方面做出贡献。本科生也将参与研究。将开发相关的视觉学习和基于网络的工具来整合研究和教育活动。