长时间传播的极声热传递:塑造辐射到导电
Sichao Li1, Jingxuan Wang1, Yue Wen1
1Department of Mechanical Engineering, College of Design and Engineering, National University of Singapore, 9 Engineering Drive 1, Singapore 117575, Singapore.
ACS nano
|May 24, 2024
概括
表面的声子极子子 (SPhP) 能够实现远程能量传输. 这项研究揭示了SPhPs显著提高纳米结构的导热性,超过了经典的限制,并提供了一个新的导热机制.
科学领域:
- 凝聚物质物理学 凝聚物质物理学
- 量子材料 量子材料是一种量子材料.
- 纳米尺度的热传递转移.
背景情况:
- 表面的声极子 (SPhPs) 结合了中红外光子和光学声,创造了用于能量转移的量子物质.
- 在极极介电纳米结构中通过SPhP观察到增强的导热性,但在兰道尔极限之外没有完全解释.
研究的目的:
- 统一SPhP介导的热传递 (导电和辐射) 的理论框架.
- 实验区分和控制不同的SPhP模式用于导热测量.
- 为了研究超出经典限制的增强导热率背后的机制.
主要方法:
- 设计了一个具有纳米结构热通道的实验平台,以区分SPhP模式 (辐射与传播).
- 调整的纳米结构配置来控制SPhP传输和影响表面导热.
- 在双热通道中观察到波干扰,以探测SPhP的特性.
主要成果:
- 通过快速的SPhP模式证明了高热导电性 (1.63nW/K),与古典语声相比.
- 在515K时,测量的表面导热率高达2W/m·K.
- 确认了依赖长度的导热率,符合对极子热传导的修订后的兰道尔公式.
结论:
- SPhPs提供了独特的极极音热传导模式,不受物理边界的限制.
- 该研究提供了一个统一的理论和实验理解SPhP介导的传热.
- 这项工作为纳米设备中的新型热管理策略开辟了道路.
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