Meng Zhu,Yuting Lei,Heng Wu,Luo Kong,Hailong Xu,Xuanxuan Yan,Yongjian Xu,Lei Dai
Exploring an advanced and efficient electromagnetic (EM) wave absorbing material by improving dielectric loss capacity and adjusting impendence matching is crucial yet challenging. Herein, the bacterial cellulose (BC) derived carbon aerogel (CA) with a robust nanofibrous network was used as a conductive loss scaffold to dissipate EM waves effectively, and the ZnO microparticles with excellent dielectric properties and low electrical conductivity were decorated on the scaffold to adjust dielectric parameters and impedance matching adequately. By using different zinc precursors, the tunable size and morphologies of ZnO crystals were obtained due to the growth rate of different crystallographic, including flower-like, nanorod like, and cauliflower-like morphologies, which is beneficial to strong multiple reflections, intensive interfacial polarization, better impendence matching, as well as excellent maintenance of the hierarchical structure. Owing to the appropriate impendence matching and the considerable EM wave dissipation, the CA@ZnO composites achieve a superior EM absorbing performance with a broad effective absorbing bandwidth (whole X band) and a minimum reflection coefficient (−53.3 dB). This work paves a new way for developing lightweight and highly efficient EM absorbing materials comprising the carbon scaffold and semiconductor microparticles.
This study presents the fabrication of pinecone-structured ZnO microparticles using a solvothermal method, which were subsequently applied to steel surfaces in combination with epoxy resin and perfluorosilane to create a superhydrophobic coating, termed FluoroZnO-Fe. The low surface energy and micro-nano hierarchical structure of the prepared coating significantly enhance its water repellency and reduces its adhesion, resulting in water contact angle as high as 161° and sliding angle as low as 2°. The FluoroZnO-Fe surface demonstrated exceptional stability. Its water contact angle remains above 150° and water sliding angle remains below 5° even after treated with mechanical abrasion, high temperatures, and exposure to acidic and alkaline environments. Importantly, when subjected to heated circulating brine, the FluoroZnO-Fe coating exhibited remarkable anti-scaling properties, achieving a 93.4% reduction in scale deposition compared to untreated bare steel. This research highlights the potential of FluoroZnO-Fe coatings for industrial applications where corrosion resistance and self-cleaning properties are critical.
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