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Nature inspired hierarchical structures in nano-cellular epoxy/graphene-Fe3O4 nanocomposites with ultra-efficient EMI and robust mechanical strength

引用

Journal of Materials Science & Technology 2022年第8期103卷 177-185页

作者： Xun Fan Fengchao Wang Qiang Gao Yu Zhang Fei Huang Ronglin Xiao Jianbin Qin Han Zhang Xuetao Shi Guangcheng Zhang Shaanxi Key Laboratory of Macromolecular Science and Technology School of Chemistry and Chemical EngineeringNorthwestern Polytechnical UniversityXi’an 710072PR China NPU-QMUL Joint Research Institute of Advanced Materials and structures Northwestern Polytechnical UniversityXi’an 710072PR China Shaanxi Coal Chemical Industry Technology Research Institute Co.Ltd Xi’anShaanxi 710070PR China School of Engineering and Materials Science Queen Mary University of LondonMile End RoadLondon E14NSUK

Hierarchical layered structures,whether in a compact form like nacre or a porous manner like bone,are well known for their combined features of high stiffness,strength,and lightweight,inspiring many man-made materials and structures for high performance *** use of nacre/bone like hierarchical structures in polymer nanocomposites can achieve excellent mechanical and functional properties with high filler volume fractions after carefully aligning functional nanofillers,although the fabrication and processing remain a great *** this work,a bio-inspired lightweight nano-cellular epoxy/graphene-Fe_(3)O_(4) nanocomposite with high nanofiller loading of 75 wt.%was successfully fabricated by combining features from both nacre and bone structures,via a simple compression molding process together with an eco-friendly supercritical CO_(2) foaming process to achieve robust mechanical strength and excellent electromagnetic interference(EMI)shielding effectiveness(SE)*** aligned graphene-Fe_(3)O_(4) nanoplatelets with well controlled nanoscale porous structures(52.6 nm)enabled both low density(1.26 g/cm^(3))and high specific EMI SE>5200 dB/cm^(2)/g,as well as preserved tensile strength of 67 *** study provides a sustainable route to fabricate nature mimicked structures with high performance and high flexibility for a wide range of applications,from portable electronics to healthcare devices.

关键词： Epoxy foam layered nano-cellular structures Graphene-Fe_(3)O_(4)nanocomposites Electromagnetic interference shielding

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