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pentamode metamaterials for acoustic wave control

光电工程 2017年第1期44卷 122-122页

作者： Zhaohong Wang Chengxin Cai Yangyang Chu Guangshun Liu Key Laboratory for Physical Electronics and Devices of the Ministry of Education & Department of Electronic Science and Technology Xi'an Jiaotong University Xi'an 710049 China

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关键词： acoustic wave control pentamode metamaterials Bragg scattering local resonance

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3D Printed Biomimetic metamaterials with Graded Porosity and Tapering Topology for Improved Cell Seeding and Bone Regeneration

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Bioactive Materials 2023年第7期25卷 677-688页

作者： Lei Zhang Bingjin Wang Bo Song Yonggang Yao Seung-Kyum Choi Cao Yang Yusheng Shi State Key Laboratory of Material Processing and Die&Mould Technology School of Materials Science and EngineeringHuazhong University of Science and TechnologyWuhan430074China Department of Orthopaedics Union HospitalTongji Medical CollegeHuazhong University of Science and TechnologyWuhan430022China George W.Woodruff School of Mechanical Engineering Georgia Institute of TechnologyAtlantaGA30332USA

Biomimetic metallic biomaterials prepared for bone scaffolds have drawn more and more attention in recent ***,the topological design of scaffolds is critical to cater to multi-physical requirements for efficient cell seeding and bone regeneration,yet remains a big scientific challenge owing to the coupling of mechanical and mass-transport properties in conventional scaffolds that lead to poor control towards favorable modulus and permeability ***,inspired by the microstructure of natural sea urchin spines,biomimetic scaffolds constructed by pentamode metamaterials(PMs)with hierarchical structural tunability were additively manufactured via selective laser *** mechanical and mass-transport properties of scaffolds could be simultaneously tuned by the graded porosity(B/T ratio)and the tapering level(D/d ratio).Compared with traditional metallic biomaterials,our biomimetic PM scaffolds possess graded pore distribution,suitable strength,and significant improvements to cell seeding efficiency,permeability,and impact-tolerant capacity,and they also promote in vivo osteogenesis,indicating promising application for cell proliferation and bone regeneration using a structural innovation.

关键词： Biomimetic biomaterials pentamode metamaterials Selective laser melting Mass-transport properties Bone scaffolds

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pentamode-Based Coding Metasurface for Underwater Acoustic Stealth

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Journal of Applied Mathematics and Physics 2021年第7期9卷 1829-1836页

作者： Li He Li Cai Xing Chen Science and Technology on Integrated Logistics Support Laboratory National University of Defense Technology Changsha China

Coding metasurface draws amounts of research interests due to its potential for achieving sophisticated functions in wave manipulation by using simple logical unit cells with out-of-phase responses. In this paper, we present a novel acoustic coding metasurface structure for underwater sound scattering reduction based on pentamode metamaterials. The metasurface is composed of two types of hexagonal pentamode unit cells with phase responses of 0 and π respectively. The units are arranged in random 1-bit coding sequence to achieve low-scattering underwater acoustic stealth effect. Full-wave simulation results are in good accordance with the theoretical expectation. The optimized arrangement resulted in the distribution of scattered underwater acoustic waves and suppression of the far field scattering coefficient over a wide range of incident angles. We show that pentamode-based coding metasurface provides an efficient scheme to achieve underwater acoustic stealth by ultrathin structures.

关键词： pentamode metamaterials Coding Metasurface Structure Underwater Sound Scattering

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pentamode-Based Coding Metasurface for Underwater Acoustic Stealth

Pentamode-Based Coding Metasurface for Underwater Acoustic S...

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作者： Li He Li Cai Xing Chen Science and Technology on Integrated Logistics Support Laboratory National University of Defense Technology

关键词： pentamode metamaterials Coding Metasurface Structure Underwater Sound Scattering

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