Xu Xinyu, Qing Yongquan, Liu Niu, Long Cai, Ma Junchi, Cui Miao, Yao Yuxuan, Yao Wenbo, Liu Changsheng
School of Materials Science and Engineering, Northeastern University, Shenyang 110819, China.
Key Laboratory for Anisotropy and Texture of Materials, Ministry of Education, Northeastern University, Shenyang 110819, China.
ACS Appl Mater Interfaces. 2022 Aug 17;14(32):37039-37050. doi: 10.1021/acsami.2c09215. Epub 2022 Aug 3.
Superhydrophobic/electromagnetic interference (EMI) shielding materials have received a great deal of attention, attributing to their excellent water repellence characteristic. However, it is really challenging to simultaneously achieve materials with superhydrophobicity, high EMI shielding performance, and long-term stability of these materials that can operate around the clock in harsh service conditions. Herein, a novel strategy to create an integrated microskeleton magnetic nanofiller composite (IMMNC) with exceptional liquid repellency, enhanced EMI shielding effectiveness, and extreme environment reliability is reported. The superhydrophobicity of the IMMNC was maintained after extreme mechanical and chemical damage due to the synergistic enhancement between epoxy-silicone oligomers/polymerized rosin and microskeleton. Consecutively hierarchical micro/nanoarchitectures and conductive pathways endow the IMMNC with a high EMI shielding effectiveness up to 80.7 dB and a satisfactory antifouling capacity for solid and water-based contaminants. More interestingly, this composite still maintains a superior EMI shielding performance after being subjected to ultrasonic vibration, low (-20 °C) or high temperature (300 °C), and even strong acid (1 M), demonstrating its great potential and reliability as a high-performance EMI shielding material resistant to harsh operating conditions. This work provides an efficient and practical solution for developing next-generation EMI shielding materials with high reliability in an all-weather complex and changeable environment.
超疏水/电磁干扰（EMI）屏蔽材料因其优异的拒水特性而备受关注。然而，要同时实现具有超疏水性、高EMI屏蔽性能以及能在恶劣服役条件下全天候运行的材料的长期稳定性，确实具有挑战性。在此，报道了一种创建具有卓越拒液性、增强的EMI屏蔽效能和极端环境可靠性的集成微骨架磁性纳米填料复合材料（IMMNC）的新策略。由于环氧 - 有机硅低聚物/聚合松香与微骨架之间的协同增强作用，IMMNC在遭受极端机械和化学损伤后仍能保持超疏水性。连续的分级微/纳米结构和导电通路赋予IMMNC高达80.7 dB的高EMI屏蔽效能以及对固体和水基污染物令人满意的防污能力。更有趣的是，该复合材料在经受超声振动、低温（-20°C）或高温（300°C）甚至强酸（1 M）后仍保持优异的EMI屏蔽性能，证明了其作为耐恶劣运行条件的高性能EMI屏蔽材料的巨大潜力和可靠性。这项工作为在全天候复杂多变环境中开发具有高可靠性的下一代EMI屏蔽材料提供了一种高效实用的解决方案。
