Abstract
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.
基金项目
National Natural Science Foun-dation of China(51773170)
Shaanxi Coal Joint Fund(2019JLM-24)
Interna-tional Science&Technology Cooperation Plan of Shaanxi Province(2021KW-52)
Fund of Natural Science Foundation of Shaanxi Provincial(2021JQ-111)
Fund of Basic and Applied Funda-mental Research of Guangdong Provincial(2020A1515110861)
Innovation Foundation for Doctor Disserta-tion of Northwestern Polytechnical University(CX202051)
Analytical&Testing Center of Northwest-ern Polytechnical University for equipment supporting()
NETL
NSTL
维普
万方数据