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Magnetic foams from polyurethane and magnetite applied as attenuators of electromagnetic radiation in X band

机译:来自聚氨酯和磁铁矿的磁性泡沫作为X波段的电磁辐射衰减器

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摘要

In this work, electromagnetic radiation absorbent materials (ERAM) were prepared from expanded polyurethane and nano-Fe3O4. The effect of porosity and charge content on the attenuation of incident radiation was investigated using helium gas pycnometry and the waveguide technique in the frequency range of 8 to 12 GHz (X-band). ERAM were also characterized by Fourier transform infrared spectroscopy (FTIR), scanning electron microscopy (SEM), thermogravimetric analysis (TGA) and vibration sample magnetometer (VSM). Pure polyurethane absorbed 93.6% of the incident radiation at 11.8GHz. This result was attributed to its porous structure and low porosity. Although the content of open cells increases in ERAM with the increase in nanomagnetic content, materials containing 1% and 5% w/w absorbed more than 99% of the incident radiation. This behavior suggests that magnetic property of the charge is compensated for its action as a cell opener in these materials.
机译:本文以膨胀聚氨酯和纳米四氧化三铁为原料,制备了电磁辐射吸收材料。利用氦气比重计和波导技术,在8~12ghz(X波段)的频率范围内研究了孔隙率和电荷含量对入射辐射衰减的影响。用傅里叶变换红外光谱(FTIR)、扫描电子显微镜(SEM)、热重分析(TGA)和振动样品磁强计(VSM)对ERAM进行了表征。在11.8GHz时,纯聚氨酯吸收了93.6%的入射辐射。这一结果归因于其多孔结构和低孔隙率。尽管在ERAM中,开放细胞的含量随着纳米磁性含量的增加而增加,但含有1%和5%w/w的材料吸收了超过99%的入射辐射。这种行为表明,在这些材料中,电荷的磁性可以补偿其作为细胞开启剂的作用。

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