具有随机和定向填料分布的碳纳米管/BaFeGaO/环氧树脂复合材料的电磁特性
Electromagnetic Properties of Carbon Nanotube/BaFeGaO/Epoxy Composites with Random and Oriented Filler Distributions.
作者信息
Yakovenko Olena S, Matzui Lyudmila Yu, Vovchenko Ludmila L, Oliynyk Victor V, Zagorodnii Volodymyr V, Trukhanov Sergei V, Trukhanov Alex V
机构信息
Physics Department, Taras Shevchenko National University of Kyiv, Volodymyrska Str. 64/13, 01601 Kyiv, Ukraine.
Department of Technology of Electronics Materials, National University of Science and Technology "MISiS", Leninskii av., 4119049 Moscow, Russia.
出版信息
Nanomaterials (Basel). 2021 Oct 28;11(11):2873. doi: 10.3390/nano11112873.
The microwave properties of epoxy composites filled with 30 wt.% of BaFeGaO (0.1 ≤ ≤ 1.2) and with 1 wt.% of multi-walled carbon nanotubes (CNTs) were investigated in the frequency range 36-55 GHz. A sufficient increase in the microwave shielding efficiency was found for ternary 1 wt.%CNT/30 wt.% BaFeGaO/epoxy composites compared with binary 1% CNT/epoxy and 30 wt.% BaFeGaO/epoxy due to the complementary contributions of dielectric and magnetic losses. Thus, the addition of only 1 wt.% of CNTs along with 30 wt.% of barium hexaferrite into epoxy resin increased the frequency range where electromagnetic radiation is intensely attenuated. A correlation between the cation Ga concentration in the BaFeGaO filler and amplitude-frequency characteristics of the natural ferromagnetic resonance (NFMR) in 1 wt.%CNT/30 wt.% BaFeGaO/epoxy composites was determined. Higher values of the resonance frequency fres (51.8-52.4 GHz) and weaker dependence of fres on the Ga concentration were observed compared with pressed polycrystalline BaFeGaO (fres = 49.6-50.4 GHz). An increase in the NFMR amplitude on the applied magnetic field for both random and aligned 1 wt.% CNT/30 wt.% BaFeGaO/epoxy composites was found. The frequency of NFMR was approximately constant in the range of the applied magnetic field, H = 0-5 kOe, for the random 1 wt.% CNT/30 wt.% BaFeGaO/epoxy composite, and it slightly increased for the aligned 1 wt.% CNT/30 wt.% BaFeGaO/epoxy composite.
研究了填充30 wt.%的BaFeGaO（0.1≤≤1.2）和1 wt.%多壁碳纳米管（CNT）的环氧复合材料在36 - 55 GHz频率范围内的微波特性。由于介电损耗和磁损耗的互补作用，与二元1% CNT/环氧和30 wt.% BaFeGaO/环氧复合材料相比，三元1 wt.% CNT/30 wt.% BaFeGaO/环氧复合材料的微波屏蔽效率有显著提高。因此，仅在环氧树脂中添加1 wt.%的CNTs和30 wt.%的钡铁氧体，就增加了电磁辐射强烈衰减的频率范围。确定了BaFeGaO填料中阳离子Ga浓度与1 wt.% CNT/30 wt.% BaFeGaO/环氧复合材料中自然铁磁共振（NFMR）的幅频特性之间的相关性。与压制的多晶BaFeGaO（fres = 49.6 - 50.4 GHz）相比，观察到共振频率fres更高（51.8 - 52.4 GHz），且fres对Ga浓度的依赖性更弱。发现随机排列和取向排列的1 wt.% CNT/30 wt.% BaFeGaO/环氧复合材料在施加磁场时NFMR幅度均增加。对于随机排列的1 wt.% CNT/30 wt.% BaFeGaO/环氧复合材料，在施加磁场H = 0 - 5 kOe范围内，NFMR频率近似恒定；对于取向排列的1 wt.% CNT/30 wt.% BaFeGaO/环氧复合材料，NFMR频率略有增加。
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