High-efficiency electromagnetic interfer-ence(EMI)shielding materials are of great importance for electronic equipment reliability,information security and human health.In this work,bidirectional aligned Ti3C2Tx@Fe3O4/CNF aerogels(BTFCA)were firstly assembled by bidirectional freezing and freeze-drying technique,and the BTFCA/epoxy nanocomposites with long-range aligned lamellar structures were then prepared by vacuum-assisted impregnation of epoxy resins.Ben-efitting from the successful construction of bidirectional aligned three-dimensional conductive networks and electromagnetic synergistic effect,when the mass fraction of Ti3C2Tx and Fe3O4 are 2.96 and 1.48 wt％,BTFCA/epoxy nanocomposites show outstanding EMI shield-ing effectiveness of 79 dB,about 10 times of that of blended Ti3C2Tx@Fe3O4/epoxy(8 dB)nanocomposites with the same loadings of Ti3C2Tx and Fe3O4.Meantime,the corresponding BTFCA/epoxy nanocomposites also present excellent thermal stability(Theat-resistance index of 198.7℃)and mechanical properties(storage modulus of 9902.1 MPa,Young's modulus of 4.51 GPa and hardness of 0.34 GPa).Our fabricated BTFCA/epoxy nanocomposites would greatly expand the applications of MXene and epoxy resins in the fields of information security,aerospace and weapon manufacturing,etc.

Shaanxi Key Laboratory of Catalysis,School of Chemistry&Environment Science,Shaanxi University of Technology,Hanzhong 723001,People's Republic of China;Shaanxi Key Laboratory of Macromolecular Science and Technology,School of Chemistry and Chemical Engineering,Northwestern Polytechnical University,Xi'an 710072,People's Republic of China

[1]Lei Wang;Zhonglei Ma;Hua Qiu;Yali Zhang;Ze Yu;Junwei Gu-.Significantly Enhanced Electromagnetic Interference Shielding Performances of Epoxy Nanocomposites with Long-Range Aligned Lamellar Structures)[J].纳微快报（英文）,2022(12):617-629

BTFCA,efitting,Theat

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