Encapsulated phase change nanoparticles for heat transfer

CBET-0828466 SuA预计未来电子和激光元件的功率密度将增加数倍。为了使用微通道将半导体和激光器等待冷却设备的温度保持在几摄氏度内，需要具有高热容的新型冷却剂。该项目提出使用新型高热容纳米材料进行主动热管理。为此目的，与纳米材料相关的基本问题将在错综复杂的细节进行研究。这项研究将集中在纳米粒子的合成和表征，纳米粒子与水的相容性，以及新型流体的热物理性质的测量。特别注意的是纳米粒子的结构-性能相关性，尺寸和界面依赖的相变行为。该项目的最终目标是以纳米颗粒合成，表面改性，热物理性能测量和微通道传热的形式整合纳米材料化学，传热和热力学领域，以研究在所需温度范围内具有大热容的下一代冷却剂的基本原理。使用纳米颗粒来增加热容的概念很重要，在热传输中实现这样的系统可能会对该领域产生潜在影响。智力优点：到目前为止，大多数纳米流体的研究都只集中在提高导热性上;在载液中使用纳米材料从而增加冷却剂的热容的概念是创造性和原创性的。这具有显著影响传热领域的变革潜力。如果成功，该研究项目将提供有关纳米材料的尺寸和界面依赖性热物理性质（即熔化温度和熔化潜热）的新知识，这对于新型传热流体的合理设计是不可或缺的。PI将表面和胶体化学的基本方面与热力学和传热学的基本方面相结合，这将为一种新的多学科方法铺平道路。因此，特别是在纳米材料合成和高热通量电子器件的新型冷却解决方案领域的研究将受到智力上的影响。更广泛的影响：封装的纳米颗粒对于微电子器件中的低温散热非常重要。该项目的成果广泛地有助于物理化学科学和高功率微电子和激光器的主动热管理技术的进步。该提案还概述了如何使用这种新的传热概念对各级教育产生广泛影响的计划。探索性概念的明确途径将对初中和高中学生有吸引力，有助于激发他们对科学和工程的兴趣。与封装相变纳米粒子的开发和表征相关的活动对研究生培养批判性思维，创造性解决问题的科学习惯以及在基础技术和先进材料上建立先进的工程平台具有很强的指导意义。该研究将成为两篇博士论文的核心。

CBET-0828466SuA several-fold increase in power density is anticipated in future electronics and laser components. In order to keep the temperature of devices such as semiconductors and lasers to be cooled within a few degrees Celsius using microchannels, novel coolants with high heat capacity are needed. This project proposes the use of novel high heat capacity nanomaterials for active thermal management. For this purpose, fundamental issues associated with the nanomaterials will be studied in intricate detail. This research will focus on the synthesis and characterization of nanoparticles, the compatibility of the nanoparticles with water, and the measurement of thermophysical properties of the novel fluid. Special attention will be given to the structure-property correlation, the size- and interface-dependent phase change behavior of nanoparticles. The ultimate goal of the project is to integrate the areas of nanomaterial chemistry, heat transfer and thermodynamics in the form of nanoparticle synthesis, surface modification, thermophysical property measurements and microchannel heat transfer to study the fundamentals of next generation coolants with large heat capacity at a desired temperature range. The concept to use nanoparticles to increase heat capacity is important, and the realization of such a system in heat transport could potentially impact the area. Intellectual merit: Most of the research in nanofluids until now has focused only on improving the thermal conductivity; the concept of using nanomaterial in a carrier fluid and thus increase the heat capacity of the coolant is creative and original. This has the transformative potential to significantly impact the field of heat transfer. If successful, this research project will provide new knowledge on size- and interface-dependent thermophysical properties of nanomaterials (i.e. melting temperature and latent heat of fusion), which are indispensible for the rationale design of novel heat transfer fluids. The synergistic efforts of the PIs combining the fundamental aspects of surface and colloidal chemistry with those in thermodynamics and heat transfer would pave the way for a novel multidisciplinary approach. As a result, research especially in the areas of nanomaterial synthesis and novel cooling solutions of high heat flux electronics would be intellectually impacted. Broader impact: The encapsulated nanoparticles are important for low temperature heat removal in microelectronic devices. The outcome of this project broadly helps in the advancement of the science of physical chemistry and the technology of active thermal management of high power microelectronics and lasers. The proposal also outlines plans on how to use this novel concept of heat transfer to provide a broad impact on education at various levels. The clear pathway to the exploratory concepts will be attractive to middle and high school students, helping to ignite their interests in science and engineering. The activities associated with the development and characterization of encapsulated phase change nanoparticles are highly instructive for graduate students in developing scientific habit of critical thinking, creative problem-solving and building advanced engineering platforms on fundamental technologies and advanced materials. The proposed research will form the cores of two PhD dissertations.