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Significantly Enhanced Electromagnetic Interference Shielding Performances of Epoxy Nanocomposites with Long-Range Aligned Lamellar Structures
Nano-Micro Letters ( IF 31.6 ) Pub Date : 2022-11-15 , DOI: 10.1007/s40820-022-00949-8
Lei Wang 1, 2 , Zhonglei Ma 2 , Hua Qiu 2 , Yali Zhang 2 , Ze Yu 2 , Junwei Gu 2
Affiliation  

High‑efficiency electromagnetic interference (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. Benefitting 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 shielding 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 °C) 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.



中文翻译:

具有长程排列层状结构的环氧纳米复合材料显着增强的电磁干扰屏蔽性能

高效电磁干扰(EMI)屏蔽材料对电子设备的可靠性、信息安全和人体健康具有重要意义。在这项工作中,双向排列的Ti 3 C 2 T x @Fe 3 O 4 /CNF气凝胶(BTFCA)首先通过双向冷冻和冷冻干燥技术组装,然后制备具有长程排列层状结构的BTFCA/环氧纳米复合材料。通过真空辅助浸渍环氧树脂制备。受益于双向排列的三维导电网络的成功构建和电磁协同效应,当Ti 3 C 2 T x的质量分数和 Fe 3 O 4分别为 2.96 和 1.48 wt%,BTFCA/环氧树脂纳米复合材料显示出 79 dB 的出色 EMI 屏蔽效能,约为混合 Ti 3 C 2 T x @Fe 3 O 4 /环氧树脂 (8 dB) 纳米复合材料的 10 倍具有相同负载量的 Ti 3 C 2 T x和 Fe 3 O 4。同时,相应的BTFCA/环氧纳米复合材料也表现出优异的热稳定性(T耐热指数198.7 °C)和机械性能(储能模量为 9902.1 MPa,杨氏模量为 4.51 GPa,硬度为 0.34 GPa)。我们制造的 BTFCA/环氧纳米复合材料将极大地扩展 MXene 和环氧树脂在信息安全、航空航天和武器制造等领域的应用。

更新日期:2022-11-15
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