Domain-Engineering Enabled Thermal Switching in Ferroelectric Materials

领域工程支持铁电材料中的热开关

• 批准号: 2011978
• 负责人: Jun Liu
• 金额: $ 55.86万
• 依托单位: North Carolina State University
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 2020
• 资助国家: 美国
• 起止时间: 2020-07-01 至 2024-06-30
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=2011978&HistoricalAwards=false
• 关键词: Domain; Engineering; Enabled; Thermal; Switching

NON-TECHNICAL DESCRIPTION: Today, the means to realize active and reversible control over thermal conductivity in solid-state materials are extremely limited, despite the strong demands from both the energy and electronics industries for energy regulation. One promising strategy is to manipulate reconfigurable interfaces in materials with substantial thermal resistances to heat flow. This project advances the current fundamental understanding on the thermal transport mechanisms across these reconfigurable interfaces. This research has translational implications for a wide range of applications in the sustainable energy infrastructure, such as waste-heat energy conversion, energy harvesting, and solid-state cooling for integrated electronics. Research and education are integrated through a focus on motivating and training students to pursue science and engineering occupations, specifically in the areas of materials for sustainable energy and advanced electronics.TECHNICAL DETAILS: Fundamental mechanisms on how the thermal energy is transferred across reconfigurable domain walls in ferroelectric materials is poorly understood. Therefore, the focus of the project is to elucidate the roles of ferroelectric domain walls, especially their spatial distribution (e.g., density, orientation, and shape anisotropy), on the Kapitza resistance and thermal transport. Complementary theoretical and experimental approaches are applied: (1) The anisotropic thermal conductivity of ferroelectric thin films and single crystals are measured to reveal the dependence of Kapitza resistance at domain walls on the domain structures and temperature; (2) Molecular dynamics simulation is conducted to analyze how the Kapitza resistance depends on the interactions of energy carriers (i.e., phonons) with domain walls. These research activities aim to advance the current understanding on the microscopic thermal transport mechanisms in ferroelectric materials. The outreach activities are developing cinematic 360 virtual-reality laboratory tours to ‘teleport’ on-line K-12 students into the laboratory to visualize materials research and applications in sustainable energy. Undergraduate and graduate students are trained through interdisciplinary research experiences to promote the importance and challenges of energy savings, thermal management, and energy conversion in sustainable energy infrastructure.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.

非技术描述：如今，实现对固态材料中热导率的主动和可逆控制的手段极为有限，对能源和电子行业的强劲需求对能源调节的需求也有很强的需求。一种承诺的策略是操纵对热流的极大耐热性的材料中的可重构界面。该项目对这些可重构接口的热运输机制的当前基本了解提高了。这项研究对可持续能源基础设施中的广泛应用具有转化含义，例如废物热转化，能源收集和综合电子固态冷却。研究和教育是通过着重于激励和培训学生购买科学和工程活动的集成，特别是在可持续能源和先进电子产品的材料领域。技术细节：有关如何在铁电材料中如何在铁电材料中转移热能的基本机制。因此，该项目的重点是阐明铁电域壁的作用，尤其是它们的空间分布（例如，密度，方向和形状各向异性），在Kapitza耐药性和热传输中的作用。采用互补的理论和实验方法：（1）测量铁电薄膜和单晶的各向异性导热率，以揭示Kapitza耐药性在域结构和温度上的域壁上的依赖性； （2）进行分子动力学模拟，以分析kapitza抗性如何取决于能载体（即声子）与域壁的相互作用。这些研究活动旨在提高对铁电材料中微观热运输机制的当前理解。外展活动正在开发Cinematic 360虚拟现实实验室之旅，以“传送”在线K-12学生进入实验室，以可视化材料研究和可持续能源中的应用。通过跨学科的研究经验对本科生和研究生进行了培训，以促进能源节省，热管理和能源转化的重要性和挑战。该奖项反映了NSF的法规任务，并已通过评估基金会的知识和更广泛的影响来诚实地通过评估来诚实地获得支持。

项目成果

Evaluating the roles of temperature-dependent eigenvectors in predicting phonon transport properties of anharmonic crystals using normal mode analysis methods

• DOI: 10.1063/5.0053287
• 发表时间: 2021-06
• 期刊: Journal of Applied Physics
• 影响因子: 3.2
• 作者: Jixiong He;Jun Liu

A Revisit to the First-Principles Prediction of Interfacial Thermal Conductance of Layered Materials Using Diffuse Mismatch Model

重新审视使​​用扩散失配模型预测层状材料界面热导率的第一性原理

• DOI: 10.1115/ht2022-78001
• 发表时间: 2022
• 期刊: Heat Transfer Summer Conference
• 作者: He, Jixiong;Liu, Jun
• 通讯作者: Liu, Jun

Ferroelectric Domain Wall Engineering Enables Thermal Modulation in PMN–PT Single Crystals

铁电畴壁工程实现 PMN–PT 单晶的热调制

• DOI: 10.1002/adma.202211286
• 发表时间: 2023
• 期刊: Advanced Materials
• 影响因子: 29.4
• 作者: Negi, Ankit;Kim, Hwang Pill;Hua, Zilong;Timofeeva, Anastasia;Zhang, Xuanyi;Zhu, Yong;Peters, Kara;Kumah, Divine;Jiang, Xiaoning;Liu, Jun
• 通讯作者: Liu, Jun