Ma Chengcheng, Wang Wei, Wang Qi, Sun Ning, Hu Songqing, Wei Shuang, Feng Huimeng, Hao Xiangping, Li Wen, Kong Debao, Wang Shihe, Chen Shougang
School of Materials Science and Engineering, Ocean University of China, Qingdao 266100, China.
School of Materials Science and Engineering, Ocean University of China, Qingdao 266100, China.
J Colloid Interface Sci. 2021 Jul 15;594:604-620. doi: 10.1016/j.jcis.2021.03.048. Epub 2021 Mar 15.
A three-dimensional hollow NiCoO structure was successfully prepared with a precipitation-hydrothermal method. A balance between magnetic and dielectric losses was achieved by using a hollow NiCoO structure loaded with benzotriazole (BTA), and thus the performance of electromagnetic waves was attenuated. The minimum reflection loss value of BTA@NiCoO at 16.01 GHz was -35.39 dB when the absorber thickness was 2 mm, at which the absorption bandwidth for an RL of less than -10 dB is as high as 4.64 GHz. The absorption mechanism was characterized by the synergy among interfacial polarization, multiple reflection, and dipole polarization enhancement between NiCoO and BTA. Interestingly, the epoxy/BTA@NiCoO coating not only exhibited an outstanding microwave absorption (MA) performance but also has excellent anticorrosion and self-healing properties, as shown by the results of electrochemical impedance spectroscopy and confocal laser scanning microscopy. This work would be very helpful to the development of novel coatings with excellent MA performance and anticorrosion and self-healing properties.
采用沉淀-水热法成功制备了三维空心NiCoO结构。通过使用负载苯并三唑（BTA）的空心NiCoO结构，实现了磁损耗和介电损耗之间的平衡，从而使电磁波性能得到衰减。当吸收体厚度为2 mm时，BTA@NiCoO在16.01 GHz处的最小反射损耗值为-35.39 dB，此时RL小于-10 dB的吸收带宽高达4.64 GHz。其吸收机制的特征在于NiCoO与BTA之间的界面极化、多次反射以及偶极极化增强之间的协同作用。有趣的是，环氧/BTA@NiCoO涂层不仅表现出优异的微波吸收（MA）性能，还具有出色的防腐和自愈性能，电化学阻抗谱和共聚焦激光扫描显微镜的结果表明了这一点。这项工作将对开发具有优异MA性能以及防腐和自愈性能的新型涂层非常有帮助。
