Torsello Daniele, Bartoli Mattia, Giorcelli Mauro, Rovere Massimo, Arrigo Rossella, Malucelli Giulio, Tagliaferro Alberto, Ghigo Gianluca
Politecnico di Torino, Department of Applied Science and Technology, C.so Duca degli Abruzzi 24, 10129 Turin, Italy.
Istituto Nazionale di Fisica Nucleare, Sez. Torino, Via P. Giuria 1, 10125 Turin, Italy.
Nanomaterials (Basel). 2021 Sep 13;11(9):2383. doi: 10.3390/nano11092383.
We report on the microwave shielding efficiency of non-structural composites, where inclusions of biochar-a cost effective and eco-friendly material-are dispersed in matrices of interest for building construction. We directly measured the complex permittivity of raw materials and composites, in the frequency range 100 MHz-8 GHz. A proper permittivity mixing formula allows obtaining other combinations, to enlarge the case studies. From complex permittivity, finally, we calculated the shielding efficiency, showing that tailoring the content of biochar allows obtaining a desired value of electromagnetic shielding, potentially useful for different applications. This approach represents a quick preliminary evaluation tool to design composites with desired shielding properties starting from physical parameters.
我们报告了非结构复合材料的微波屏蔽效率，其中生物炭（一种经济高效且环保的材料）夹杂物分散在建筑施工感兴趣的基质中。我们直接测量了原材料和复合材料在100 MHz - 8 GHz频率范围内的复介电常数。一个合适的介电常数混合公式可以得到其他组合，以扩大案例研究范围。最后，根据复介电常数，我们计算了屏蔽效率，结果表明调整生物炭的含量可以获得所需的电磁屏蔽值，这可能对不同应用有用。这种方法代表了一种快速的初步评估工具，可从物理参数出发设计具有所需屏蔽性能的复合材料。
