Sima Wenxia, Liang Chen, Sun Potao, Yang Ming, Zhu Chun, Yuan Tao, Liu Fengqi, Zhao Mingke, Shao Qianqiu, Yin Ze, Deng Qin
State Key Laboratory of Power Transmission Equipment & System Security and New Technology, Chongqing University, Chongqing 400044, People's Republic of China.
Key Laboratory of Energy Thermal Conversion and Control of Ministry of Education, School of Energy and Environment, Southeast University, Nanjing, Jiangsu 210096, People's Republic of China.
ACS Appl Mater Interfaces. 2021 Jul 21;13(28):33485-33495. doi: 10.1021/acsami.1c07469. Epub 2021 Jul 7.
It remains challenging to promptly inhibit and autonomically heal electrical trees inside insulating dielectrics, which are caused by sustained strong electrical fields and substantially shorten electronic device lifetimes and even cause premature failure of electrical equipment. Therefore, we demonstrate a magnetically targeted ultraviolet (UV)-induced polymerization functional microcapsule (MTUF-MC) to endow insulating materials with physical and electrical dual-damage self-healing capabilities. Specifically, FeO@SiO and TiO nanoparticles, which serve as magnetic targets and UV shields (thereby preventing the healing agent from prematurely triggering), constitute a functional microcapsule shell, ensuring a low dopant concentration and excellent self-healing ability of the epoxy composites without affecting the intrinsic performance of the matrix. By exploiting electroluminescence originating from electrical trees, UV-induced polymerization of healing agent is handily triggered without any applying external stimuli to intelligently, contactlessly, and autonomously self-healing electrical trees inside insulating dielectrics.
迅速抑制并自动修复绝缘电介质内部的电树仍然具有挑战性，电树是由持续的强电场引起的，会大幅缩短电子设备的使用寿命，甚至导致电气设备过早失效。因此，我们展示了一种磁靶向紫外（UV）诱导聚合功能微胶囊（MTUF-MC），以使绝缘材料具有物理和电气双重损伤自愈能力。具体而言，用作磁靶和紫外线屏蔽剂（从而防止愈合剂过早触发）的FeO@SiO和TiO纳米颗粒构成了功能微胶囊壳，确保了环氧复合材料的低掺杂浓度和优异的自愈能力，同时不影响基体的固有性能。通过利用电树产生的电致发光，无需施加任何外部刺激就能轻松触发愈合剂的紫外线诱导聚合，从而在绝缘电介质内部智能、非接触和自动地自愈电树。
