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Tuning the Electromagnetic Synergistic Effects for Enhanced Microwave Absorption via Magnetic Nickel Core Encapsulated in Hydrogenated Anatase TiO2 Shell
- Xu, Jianle, Qi, Xiaosi, Sun, Yuan, Wang, Zhongchi, Liu, Yong, Luo, Chengzhi, Li, Bingjie, Zhong, Wei, Fu, Qiang, Pan, Chunxu
- ACS sustainable chemistry & engineering 2018 v.6 no.9 pp. 12046-12054
- absorption, coatings, impedance, magnetism, microparticles, nanomaterials, nickel, synergism, titanium dioxide
- Owing to tremendous potential applications, hydrogenated TiO₂ (H-TiO₂) nanomaterial has been considered an important member in the field of microwave absorption. In this paper, a kind of core–shell structured microspheres (MPs) consisting of outer-shell hydrogenated anatase TiO₂ (H-A-TiO₂) and inner-core magnetic Ni MPs were prepared successfully using a simple method. Experimental results revealed the as-prepared hydrogenated anatase TiO₂@Ni (H-A-TiO₂@Ni) composite exhibited enhanced microwave absorption property, when compared to pristine anatase TiO₂@Ni (A-TiO₂@Ni). (1) The minimum reflection loss (RL) of the H-A-TiO₂@Ni/wax composite reached −64.2 dB at a thickness of 2 mm, indicating a large absorption efficiency over 99.99%. (2) The H-A-TiO₂@Ni showed an effective microwave absorption bandwidth (RL < −20 dB) in a range from 2.2 to 11 GHz. Due to the introduction of core–shell media, coating Ni microspheres with H-A-TiO₂ shells not only will be beneficial for impedance matching behavior but also improve the electromagnetic synergistic effects. This study provides a new application area of hydrogenated TiO₂ materials as an efficiency energy absorber and opens up a new pathway for design of efficient microwave-absorbing materials.