Lei Wang, Zhonglei Ma, Hua Qiu, Yali Zhang, Ze Yu, Junwei Gu
{"title":"具有长距离排列片状结构的环氧纳米复合材料的电磁干扰屏蔽性能显著增强","authors":"Lei Wang, Zhonglei Ma, Hua Qiu, Yali Zhang, Ze Yu, Junwei Gu","doi":"10.1007/s40820-022-00949-8","DOIUrl":null,"url":null,"abstract":"<div><p>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 Ti<sub>3</sub>C<sub>2</sub>T<sub>x</sub>@Fe<sub>3</sub>O<sub>4</sub>/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 Ti<sub>3</sub>C<sub>2</sub>T<sub>x</sub> and Fe<sub>3</sub>O<sub>4</sub> 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 Ti<sub>3</sub>C<sub>2</sub>T<sub>x</sub>@Fe<sub>3</sub>O<sub>4</sub>/epoxy (8 dB) nanocomposites with the same loadings of Ti<sub>3</sub>C<sub>2</sub>T<sub>x</sub> and Fe<sub>3</sub>O<sub>4</sub>. Meantime, the corresponding BTFCA/epoxy nanocomposites also present excellent thermal stability (<i>T</i><sub>heat-resistance index</sub> 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. </p><div><figure><div><div><picture><source><img></source></picture></div></div></figure></div></div>","PeriodicalId":48779,"journal":{"name":"Nano-Micro Letters","volume":"14 1","pages":""},"PeriodicalIF":31.6000,"publicationDate":"2022-11-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.ncbi.nlm.nih.gov/pmc/articles/PMC9666581/pdf/","citationCount":"0","resultStr":"{\"title\":\"Significantly Enhanced Electromagnetic Interference Shielding Performances of Epoxy Nanocomposites with Long-Range Aligned Lamellar Structures\",\"authors\":\"Lei Wang, Zhonglei Ma, Hua Qiu, Yali Zhang, Ze Yu, Junwei Gu\",\"doi\":\"10.1007/s40820-022-00949-8\",\"DOIUrl\":null,\"url\":null,\"abstract\":\"<div><p>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 Ti<sub>3</sub>C<sub>2</sub>T<sub>x</sub>@Fe<sub>3</sub>O<sub>4</sub>/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 Ti<sub>3</sub>C<sub>2</sub>T<sub>x</sub> and Fe<sub>3</sub>O<sub>4</sub> 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 Ti<sub>3</sub>C<sub>2</sub>T<sub>x</sub>@Fe<sub>3</sub>O<sub>4</sub>/epoxy (8 dB) nanocomposites with the same loadings of Ti<sub>3</sub>C<sub>2</sub>T<sub>x</sub> and Fe<sub>3</sub>O<sub>4</sub>. Meantime, the corresponding BTFCA/epoxy nanocomposites also present excellent thermal stability (<i>T</i><sub>heat-resistance index</sub> 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). 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Significantly Enhanced Electromagnetic Interference Shielding Performances of Epoxy Nanocomposites with Long-Range Aligned Lamellar Structures
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.
期刊介绍：
Nano-Micro Letters is a peer-reviewed, international, interdisciplinary and open-access journal that focus on science, experiments, engineering, technologies and applications of nano- or microscale structure and system in physics, chemistry, biology, material science, pharmacy and their expanding interfaces with at least one dimension ranging from a few sub-nanometers to a few hundreds of micrometers. Especially, emphasize the bottom-up approach in the length scale from nano to micro since the key for nanotechnology to reach industrial applications is to assemble, to modify, and to control nanostructure in micro scale. The aim is to provide a publishing platform crossing the boundaries, from nano to micro, and from science to technologies.
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