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.

1033356 cahillnanoscale物体，例如金属纳米颗粒或碳纳米管，容易高效地吸收电磁辐射。当高强度电磁辐射被输送到此类物体（例如通过聚焦激光束）时，吸收的能量会导致纳米级物体和周围培养基的极端局部加热，并且非常大的温度升高。这些高度局部的热偏移对应于与宏观上维持的数量级的热通量相​​对应。智力优点：这项研究基于（a）基于激光的超快光学技术的进步，能够捕获PICO-到纳秒时间尺度的相关现象，以及（b）计算能力和建模技术，允许在相同的时间和特殊范围内同时对此类系统进行实验和理论上的同时检查。特别是，分子动力学模拟和时间分辨的泵探针实验将提高对纳米级固体与周围液体之间界面的传热，相变和相位平衡的理解。研究侧重于：研究的重点是对强热固体固体固体固体液体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，例如高度选择性的热疗法用于癌症治疗。 从事研究的研究生将在传热，材料科学，软性物质相互作用和相位平衡方面做出贡献。本科生还将从事这项研究。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。