This research characterized the dielectric, magnetic, microwave shielding, and mechanical properties of a highly flexible microwave shielding material made by a solution casting process using NiFe₂O₄ and biocarbon particles in a PVA matrix. Black gram waste pods were used to create biocarbon, while NiFe₂O₄ was used as-is for the magnetic counterpart. Solution casting was used to create the composites, which were then cured at room temperature. The results demonstrate that the shielding properties can be improved by using NiFe₂O₄-biocarbon hybrid particles. Results showed that the NB31 provides the best shielding efficiency at 20 GHz of 61.4 dB, better than any other composites. Similarly, the composite NB31 also has a maximum relative permittivity of 5.6 at 20 GHz. In addition to this, the highest values recorded for NB31’s magnetization, coercivity, and retentivity were 1320 E-6 emu, −12600 G, and 1215 E-6 emu. Finally, the inclusion of NiFe₂O₄-biocarbon greatly increases the tensile strength, tear strength, elongation, and hardness of composites to 38 MPa, 168 MPa, 18.4%, and 36 Shore-D, respectively. The electron microscopy fractographic images show that the NiFe₂O₄-biocarbon hybrid particle is evenly distributed in the PVA matrix, helping to fill up the voids and boost the material’s mechanical capabilities. These EMI shielding-improved flexible PVA composites could be used in electronic and defense applications where high-frequency waves need to be prevented from creating interference.

本研究表征了一种高度灵活的微波屏蔽材料的介电、磁性、微波屏蔽和机械性能，该材料通过溶液浇铸工艺在 PVA 基质中使用 NiFe ₂ O ₄和生物碳颗粒制成。黑克废料荚用于制造生物碳，而 NiFe ₂ O ₄原样用于磁性对应物。溶液浇铸用于制造复合材料，然后在室温下固化。结果表明，使用 NiFe ₂ O _{4可以提高屏蔽性能}-生物碳混合颗粒。结果表明，NB31 在 20 GHz 时提供了 61.4 dB 的最佳屏蔽效率，优于任何其他复合材料。同样，复合材料 NB31 在 20 GHz 时的最大相对介电常数也为 5.6。除此之外，NB31 的磁化强度、矫顽力和保持力的最高记录值分别为 1320 E-6 emu、-12600 G 和 1215 E-6 emu。_{最后，NiFe 2} O ₄ -生物碳的加入大大提高了复合材料的拉伸强度、撕裂强度、伸长率和硬度，分别达到 38 MPa、168 MPa、18.4% 和 36 Shore-D。电子显微镜断口图像表明，NiFe ₂ O ₄- 生物碳混合颗粒均匀分布在 PVA 基质中，有助于填充空隙并提高材料的机械性能。这些 EMI 屏蔽改进的柔性 PVA 复合材料可用于需要防止高频波产生干扰的电子和国防应用。