فهرست نشریات علمی دسترسی آزاد ایران

This research aims to investigate the effect of adding iron oxide nanoparticles (Fe₂O₃) at different concentrations to epoxy resin on both its mechanical and absorption properties within the X-band (8–12 GHz). Nanoparticles containing 1%, 3%, 5%, and 7% Fe₂O₃ were synthesized, and their mechanical behavior was evaluated using tensile strength, Young’s modulus, hardness, and impact resistance tests. The results showed that the medium concentrations (3% and 5%) achieved the best improvement in stiffness, rigidity, and energy absorption capacity, due to good particle dispersion and enhanced interfacial interaction within the polymer matrix. In contrast, the high concentration of 7% led to particle agglomeration and a decrease in some mechanical properties. Regarding microabsorbents, the enhanced samples exhibited a strong absorption response across the frequency range, with deeper and more regular absorption peaks appearing at 3% and 5% concentrations, indicating an effective balance between dielectric and magnetic loss mechanisms and impedance compatibility. At 1%, absorption performance was limited, while irregularities appeared in the 7% sample due to agglomeration. Taken together, these results suggest that the addition of Fe₂O₃ at 3–5% concentrations gives the epoxy a balanced combination of mechanical enhancement and absorption efficiency, making these composites promising candidates for wave-absorbing and radar applications.