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Hollow porous FeCo/Cu/CNTs composite microspheres with excellent microwave absorption performance

Nano Research 2024年第11期17卷 9857-9864页

作者： Xiaowei Liu Linhe Yu Guozhen Zhu Zhipeng Wang Gangjie Lian Xuhui Xiong Wenbin You Renchao Che School of Chemical Engineering Jiangxi Normal University Nanchang 330022 China Laboratory of Advanced Materials Shanghai Key Lab of Molecular Catalysis and Innovative Materials Academy for Engineering & Technology Fudan University Shanghai 200438 China Nanchang University Nanchang 330031 China School of Materials Science & Engineering Tongii University Shanghai 201804 China College of Physics Donghua University Shanghai 201620 China

Magnetic/dielectric composite materials with numerous heterointerfaces are highly promising functional materials, which are widely applied in the fields of electromagnetic wave absorption. Constructing heterogeneous structure is beneficial to further enhance the microwave absorption performance of composite materials. However, the process of constructing multi-heterogeneous interfaces is extremely complex. In this work, hollow porous FeCo/Cu/CNTs composite microspheres are prepared by the simple spray drying method and subsequently two-step annealing treatment, which possess abundant heterogeneous interfaces, unique three-dimensional conductive network and magnetic coupling network. This unique structure is beneficial to improving the ability of dielectric loss and magnetic loss, and then achieving an excellent microwave absorption performance. The prepared FeCo/Cu/CNTs-1 composite microspheres maintain a minimum reflection loss (RL) of −48.1 dB and a maximum effective absorption bandwidth of 5.76 GHz at a thickness of 1.8 mm. Generally, this work provides a new idea for designing multi-heterogeneous of microwave absorbing materials.

关键词： heterogeneous interface hollow structure three-dimensional conductive network microwave absorption

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Intrinsic elastic conductors with internal buckled electron pathway for flexible electromagnetic interference shielding and tumor ablation

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Science China Materials 2020年第7期63卷 1318-1329页

作者： Wenqian He Rui Zhang Yuanyuan Cheng Chao Zhang Xiang Zhou Zhuangjian Liu Xiaoyu Hu Zhongsheng Liu Jinkun Sun Yinsong Wang Dong Qian Zunfeng Liu Key Laboratory of Functional Polymer Materials College of PharmacyState Key Laboratory of Medicinal Chemical BiologyNankai UniversityTianjin 300071China Department of Mechanical Engineering University of Texas at DallasRichardsonTX 75080USA Tianjin Key Laboratory on Technologies Enabling Development of Clinical Therapeutics and Diagnostics(Theranostics) School of PharmacyTianjin Medical UniversityTianjin 300070China Jiangsu Key Laboratory of Bioactive Natural Product Research and State Key Laboratory of Natural Medicines China Pharmaceutical UniversityNanjing 210009China Institute of High Performance Computing A*STAR Research EntitiesSingapore 138632Singapore

The elastic conductor is crucial in wearable electronics and soft *** ideal intrinsic elastic bulk conductors show uniform three-dimensional conductive networks and stable resistance during large stretch.A challenge is that the variation of resistance is high under deformation due to disconnection of conductive pathway for bulk elastic *** strategy is to introduce buckled structure into the conductive network,by self-assembly of a carbon nanotube layer on the interconnecting micropore surface of a prestrained foam,followed by strain *** unfolding of buckles and flattening of micropores contributed to the stability of the resistance under deformation(2.0%resistance variation under 70%strain).Microstructural analysis and finite element analysis illustrated different patterns of two-dimensional buckling structures could be obtained due to the imperfections in the conductive *** as all-directional interconnects,stretchable electromagnetic interference shielding and electrothermal tumor ablation were demonstrated.

关键词： intrinsic elastic conductor buckled structure three-dimensional conductive network electromagnetic interference shielding electrothermal tumor ablation

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