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In the development of National Aeronautics and Space Administration (NASA)'s Unmanned Aerial Vehicles (UAVs), lightweight and durable materials play a crucial role for extended high‐altitude flights. Nanoparticle‐reinforced polymer composites meet these requirements, exhibiting resistance to environmental degradation. Despite their potential, the outstanding specific strength, corrosion resistance, and dimensional stability at elevated temperatures of graphene–epoxy nanocomposites have not been fully realized due to inadequate dispersion and spatial orientation within epoxy matrices. Our recent research has introduced a mathematical framework aimed at optimizing alignment parameters for graphene nanoplatelets (GNPs) and Fe3O4‐attached GNP under a weak DC magnetic field. Subsequently, nanocomposites reinforced with GNP and aligned Fe3O4–GNP nanoparticles were fabricated using optimized parameters, and their alignment was characterized using various techniques. The current study examines the influence and comparative impact of alignment and weight percentage (wt%) loading of both nanoparticles on various mechanical properties, including tensile and compressive strength, along with failure mechanisms. It was observed that both GNP and aligned Fe3O4–GNP enhance the mechanical properties of nanocomposites, particularly notable improvements from aligned Fe3O4–GNP. The Young's modulus of GNP nanocomposites increased by 17%, while aligned Fe3O4–GNP contributed significantly to a 31% enhancement in the Young modulus. Highlights: Epoxy nanocomposites featuring well‐dispersed GNP and Fe3O4–GNP nanoparticles.Proper alignment of Fe3O4–GNP within the epoxy nanocomposite was achieved.Mechanical properties improved with GNP and aligned Fe3O4–GNP incorporation.The aligned Fe3O4–GNP exhibits advanced potential for engineering applications. [ABSTRACT FROM AUTHOR]

Graphene has been hailed by scientists as the "wonder material" of the 21st century. Despite the impressive mechanical and electrical qualities of graphene in its unprocessed state, graphene‐based epoxy nanocomposites can only be used as a structural material on a small scale. The random dispersion and orientation of graphene in epoxy cause the failure. Magnetite Fe3O4 nanoparticles are synthesized and solvo‐thermally attached to the graphene nanoplatelets (GNP) surfaces in order to utilize our recently model's suggested optimized alignment parameters. Solution with properly dispersed nanoparticles, that is, Fe3O4‐GNP within epoxy, is exposed to the magnetic field (0.05 T). Morphology, microstructure, and magnetic properties of GNP, Fe3O4, and Fe3O4‐GNP nanoparticles have been characterized by X‐ray diffraction, Fourier‐transform infrared spectroscopy, Raman spectroscopy, thermogravimetric analysis, differential scanning calorimetry, atomic force microscopy, X‐ray photoelectron spectroscopy, Brunauer–Emmett–Teller, transmission electron microscopy, scanning electron microscopy, energy‐dispersive X‐ray microanalysis, and vibrating sample magnetometry. The aforementioned characterization method, optical microscopy, and studying the fracture surface morphology confirmed the alignment. The fabricated aligned Fe3O4‐GNP nanocomposite is best used as a functional material. [ABSTRACT FROM AUTHOR]