文献类型：期刊文献

英文题名：Cellular-structured carbon nanotube composite films with broadband microwave absorption and shape memory

作者：Yang, Hui Li[1];Chen, Yun[1];Li, Chao Qun[1];Wu, Guang[1];Wang, Jian Nong[1]

机构：[1]East China Univ Sci & Technol, Sch Mech & Power Engn, 130 Meilong Rd, Shanghai 200237, Peoples R China

年份：2023

卷号：210

外文期刊名：CARBON

收录：;EI(收录号：20232014084507);WOS:【SCI-EXPANDED(收录号:WOS:001001822200001)】；

基金：Acknowledgements This research was supported by National Key R & D Program of China (2018YFA0208404, 2022YFA1203300) , National Natural Science Foundation of China (52172089) , and Innovation Program of Shanghai Municipal Education Commission.

语种：英文

外文关键词：Microcellular structure; Phase separation; Composite film; Microwave absorption; Shape memory

摘要：Carbon nanotube (CNT) composite films consisting of a microcellular structure are prepared by layer-by-layer deposition and phase separation processing. Polyvinyl butyral (PVB) and CNTs form a continuous network of cell walls of less than 100 nm thick and epoxy resin (EP) spheres of 4-6 mu m in diameter constitute the cell cores with Ba-ferrite lamella aggregated among the cells. The layer-by-layer deposition of CNTs ensures a uniform dispersion of CNTs, and the EP spheres separate CNTs and Ba-ferrite to form a dielectric-magnetic coupling network. The resultant cell structure is conducive not only to achieve electromagnetic impedance matching but also to induce wave attenuation by multiple mechanisms. The composite film with optimal electromagnetic loss and impedance matching has a broad effective bandwidth of 11.5 GHz in microwave absorption at a thickness of only 0.3 mm, superior over most carbon-based microwave absorbing materials reported so far. In addition, the composite film also shows good thermal response for shape memory. This study provides a microcellular strategy for developing materials with light weight, thin thickness, broadband absorption, and shape memory for ap-plications in civil and military fields.