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 applications.The use of nacre/bone like hier-archical structures in polymer nanocomposites can achieve excellent mechanical and functional proper-ties with high filler volume fractions after carefully aligning functional nanofillers,although the fabri-cation and processing remain a great challenge.In this work,a bio-inspired lightweight nano-cellular epoxy/graphene-Fe3O4 nanocomposite with high nanofiller loading of 75 wt.％was successfully fabri-cated by combining features from both nacre and bone structures,via a simple compression molding process together with an eco-friendly supercritical CO2 foaming process to achieve robust mechanical strength and excellent electromagnetic interference(EMI)shielding effectiveness(SE)simultaneously.Highly aligned graphene-Fe3O4 nanoplatelets with well controlled nanoscale porous structures(52.6 nm)enabled both low density(1.26 g/cm3)and high specific EMI SE＞5200 dB/cm2/g,as well as preserved tensile strength of 67 MPa.This study provides a sustainable route to fabricate nature mimicked struc-tures with high performance and high flexibility for a wide range of applications,from portable electron-ics to healthcare devices.

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 Engineering,Northwestern Poly technical University,Xi'an 710072,PR China;NPU-QMUL Joint Research Institute of Advanced Materials and Structures,Northwestern Polytechnical University,Xi'an 710072,PR China;Shaanxi Coal Chemical Industry Technology Research Institute Co.Ltd,Xi'an,Shaanxi 710070,PR China;School of Engineering and Materials Science,Queen Mary University of London,Mile End Road,London E1 4NS,UK

材料科学技术（英文版）

[1]Xun Fan;Fengchao Wang;Qiang Gao;Yu Zhang;Fei Huang;Ronglin Xiao;Jianbin Qin;Han Zhang;Xuetao Shi;Guangcheng Zhang-.Nature inspired hierarchical structures in nano-cellular epoxy/graphene-Fe3O4 nanocomposites with ultra-efficient EMI and robust mechanical strength)[J].材料科学技术（英文版）,2022(08):177-185

Nature,inspired,hierarchical,structures,cellular,epoxy,graphene,Fe3O4,nanocomposites,ultra,efficient,EMI,robust,mechanical,strength,Hierarchical,layered,whether,compact,like,nacre,porous,manner,bone,well,known,their,combined,features,high,stiffness,lightweight,inspiring,many,made,materials,performance,applications,use,polymer,can,achieve,excellent,functional,proper,ties,volume,fractions,after,carefully,aligning,nanofillers,although,processing,remain,great,challenge,In,this,work,bio,loading,wt,was,successfully,cated,by,combining,from,both,via,simple,compression,molding,together,eco,friendly,supercritical,foaming,electromagnetic,interference,shielding,effectiveness,SE,simultaneously,Highly,aligned,nanoplatelets,controlled,nanoscale,enabled,low,density,cm3,specific,dB,preserved,tensile,This,study,provides,sustainable,route,fabricate,nature,mimicked,flexibility,wide,range,portable,electron,ics,healthcare,devices

0.585416