Manufacturing a Robust Thermal Metamaterial Platform based on Carbon Nanolattices

制造基于碳纳米晶格的鲁棒热超材料平台

• 批准号: 1902685
• 负责人: Jaeho Lee
• 金额: $ 39.97万
• 依托单位: University of California-Irvine
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2019
• 资助国家: 美国
• 起止时间: 2019-09-01 至 2022-08-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=1902685&HistoricalAwards=false
• 关键词: Manufacturing; Robust; Thermal; Metamaterial; Platform

While the abilities to control electricity and light have led to revolutionary progress in electronics and photonics, the ability to control heat has made relatively little progress. This is mainly due to the limited understanding of thermal transport at the nanoscale and the lack of metamaterials designed to control heat transfer. The Principal Investigators (PIs) plan to manufacture carbon-based cellular materials (i.e. carbon nanolattices) and establish a new field of thermal metamaterials. The new thermal transport and manufacturing knowledge developed in this program will guide future designs of metamaterial systems and enable developments of novel thermal insulators and thermal rectifiers. The outcomes of this research will strengthen innovation in the areas of thermal control, thermal insulation, and waste heat recovery, which will enhance the energy production in the United States, so that the research directly impacts economic welfare and national security. The research outputs will be integrated with educational activities and outreach efforts.One of main challenges in studying thermal transport mechanisms or manipulating heat flows is the diffusive nature of phonon transport, which takes over when the material size is greater than the phonon mean-free-path. The PIs will utilize the measurement and processing capabilities of two synergistic labs to create a novel metamaterial platform with feature sizes smaller than the phonon mean-free-path. The first objective is to control size, geometry, and nanostructure of carbon nanolattices via a state-of-the-art two-step additive manufacturing process, consisting of two-photon polymerization direct laser writing of a polymeric template, followed by pyrolysis of the template. The process allows fabrication of structurally robust and dense polymeric lattice materials with feature sizes at the submicron range (200-1000 nm); by accurate control of the pyrolysis, the PIs will further improve the resolution, enabling fabrication of carbon structures with exquisite control of the feature size (20-200 nm). At the same time, this process allows realization of complex three-dimensional (3D) geometries that are difficult to fabricate with conventional subtractive processes, enabling an enormous design space. By simultaneously optimizing the lattice topology and the pyrolytic carbon nanostructure, the project will exploit unique size effects in thermal conductivity. The second objective is to demonstrate a new thermal metamaterial platform based on carbon nanolattices, and this project will present two target systems including a robust thermal insulator that offers a unique combination of low thermal conductivity and high mechanical strength, and a thermal rectifier that offers novel direction-dependent thermal transport properties. The project will identify thermal transport mechanisms in architected nanolattices and develop multiscale and multifunctional optimal design models that incorporate size effects and allow exploitation of asymmetric geometries. The PIs will achieve these objectives by combining their complementary expertise in thermal and mechanical sciences, microscale metrology, 3D manufacturing, and topology optimization.This award reflects NSF's statutory mission and has been deemed worthy of support through evaluation using the Foundation's intellectual merit and broader impacts review criteria.

虽然控制电和光的能力导致了电子学和光子学的革命性进展，但控制热的能力却进展相对较小。这主要是由于对纳米级热传输的理解有限，以及缺乏旨在控制热传递的超材料。主要研究人员（PI）计划制造碳基蜂窝材料（即碳纳米晶格），并建立一个新的热超材料领域。在该计划中开发的新的热传输和制造知识将指导超材料系统的未来设计，并使新型热绝缘体和热整流器的开发成为可能。这项研究的成果将加强热控制，隔热和废热回收领域的创新，这将提高美国的能源生产，使研究直接影响经济福利和国家安全。研究成果将与教育活动和推广工作相结合。研究热输运机制或操纵热流的主要挑战之一是声子输运的扩散性质，当材料尺寸大于声子自由平均值时，PI将利用两个协同实验室的测量和处理能力来创建一个新的超材料平台，其特征尺寸更小第一个目标是通过现有技术的两步增材制造工艺来控制碳纳米晶格的尺寸、几何形状和纳米结构，所述两步增材制造工艺由聚合物模板的双光子聚合直接激光写入，然后是模板的热解组成。该工艺允许制造结构坚固和致密的聚合物晶格材料，其特征尺寸在亚微米范围（200-1000 nm）;通过精确控制热解，PI将进一步提高分辨率，从而能够制造具有精细控制特征尺寸（20-200 nm）的碳结构。同时，该工艺允许实现难以用常规减材工艺制造的复杂三维（3D）几何形状，从而实现巨大的设计空间。通过同时优化晶格拓扑结构和热解碳纳米结构，该项目将利用热导率的独特尺寸效应。第二个目标是展示一种基于碳纳米晶格的新型热超材料平台，该项目将展示两种目标系统，包括一种坚固的绝热体，它提供了低热导率和高机械强度的独特组合，以及一种热整流器，它提供了新的方向依赖性热传输特性。该项目将确定建筑纳米晶格中的热传输机制，并开发多尺度和多功能的优化设计模型，这些模型将尺寸效应纳入其中，并允许利用非对称几何形状。PI将通过结合他们在热学和机械科学、微尺度计量学、3D制造和拓扑优化方面的互补专业知识来实现这些目标。该奖项反映了NSF的法定使命，并通过使用基金会的知识价值和更广泛的影响审查标准进行评估，被认为值得支持。

项目成果

Thermal transport in 3D printed shape memory polymer metamaterials

• DOI: 10.1063/5.0094036
• 发表时间: 2022-08
• 期刊: APL Materials
• 影响因子: 6.1
• 作者: Shiva Farzinazar;Yueping Wang;Charles Abdol-Hamid Owens;Chen Yang;Howon Lee;Jaeho Lee

Thermomechanical Topology Optimization of Three-Dimensional Heat Guiding Structures for Electronics Packaging

电子封装三维热导结构的热机械拓扑优化

• DOI: 10.1115/1.4053948
• 发表时间: 2022
• 期刊: Journal of Electronic Packaging
• 影响因子: 1.6
• 作者: Farzinazar, Shiva;Ren, Zongqing;Lim, Jungyun;Kim, Jae Choon;Lee, Jaeho
• 通讯作者: Lee, Jaeho