论文标题
设计的SI超材料的变形不敏感的导热电导
Deformation insensitive thermal conductance of the designed Si metamaterial
论文作者
论文摘要
由于广泛的应用，热管理已广泛关注。通常，变形可以很大程度上调整热传输。柔性电子/材料的主要挑战是在较大的变形下维持导热率。这项工作调查了通过分子动力学模拟用弯曲的纳米梁构建的纳米设计的SI超材料的热电导。有趣的是，它表明，在较大的变形下，纳米设计的SI超材料的热电导不敏感（应变〜-41％）。新功能来自设计的弯曲纳米梁，这使得准零刚度。进一步的计算表明，当在较大的变形下，纳米束的平均应力是超小的（<151 MPa），其状态的声子密度几乎没有改变。这项工作为纳米设计的超材料的多功能（例如稳定的热和机械性能）提供了宝贵的见解。
The thermal management have been widely focused due to broad applications. Generally, the deformation can largely tune the thermal transport. The main challenge of flexible electronics/ materials is to maintain thermal conductance under large deformation. This work investigates the thermal conductance of a nano-designed Si metamaterial constructed with curved nanobeams by molecular dynamics simulation. Interestingly, it shows that the thermal conductance of the nano-designed Si metamaterial is insensitive under a large deformation (strain~-41%). The new feature comes from the designed curved nanobeams which makes a quasi-zero stiffness. Further calculations show that, when under a large deformation, the average stress in nanobeam is ultra-small (<151 MPa) and its phonon density of states are little changed. This work provides valuable insights on multifunction, such as both stable thermal and mechanical properties, of nano-designed metamaterials.
