Exploring Periodic Bicontinuous Cubic Network Structures with Complete Phononic Bandgaps
Exploring Periodic Bicontinuous Cubic Network Structures with Complete Phononic Bandgaps
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DOI：
10.1021/acs.jpcc.7b07267
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发表时间：
2017-10-12
影响因子：
3.7
通讯作者：
Wiesner, Ulrich
中科院分区：
文献类型：
--
作者：
Hur, Kahyun;Hennig, Richard G.;Wiesner, Ulrich
控制材料的声子特性为更好的隔热、减少噪音以及将废热转化为电能提供了机会。声子晶体是由两种或更多种不同材料组成的周期性结构介质，提供独特的路径来控制声子的传输，负责声音和热量的传输。特别是，具有立方网络结构的声子晶体具有完整的声子带隙是非常理想的能源应用，但尚未得到彻底的研究，阻碍了在这一领域的进展。在这里，我们计算得到的声子带结构的16立方网络结构，可以通过制造技术，包括嵌段共聚物自组装，并确定了6个结构，表现出完整的声子带隙。冠军声子带隙结构是所谓的I-WP结构，带隙宽度为0.41。在模拟结果的基础上，阐明了为较大的声子带隙定制网络结构的设计规则。我们希望我们的研究结果将为开发用于声波和热器件的新型材料提供指导。
Controlling the phononic properties of materials provides opportunities for better thermal insulation, reduction of sound noise, and conversion of wasted heat into electricity. Phononic crystals are periodically structured media composed of two or more dissimilar materials offering a unique pathway to control the transmission of phonons, responsible for sound and heat transport. In particular, phononic crystals with cubic network structure possessing complete phononic bandgaps are highly desirable for energy applications but have not been thoroughly investigated, hampering progress in this field. Here we computationally obtained phononic band structures of 16 cubic network structures that could be made by fabrication techniques including block copolymer self-assembly and identified six structures that exhibit complete phononic bandgaps. The champion phononic bandgap structure is the so-called I-WP structure with a bandgap width of 0.41. On the basis of simulation results, design rules to tailor network structures for larger phononic bandgaps are elucidated. We expect that our results will provide guidance to develop novel materials for sonic and thermal devices.