AIMS Materials Science最新文献

In this work, the Fe₃O₄ nanoparticles from natural iron sand were doped with Mn and combined with reduced-graphene oxide (rGO) to obtain Mn_xFe_3–xO₄/rGO nanocomposites with mole fraction variations of the Mn of 0.25, 0.5, and 0.75. The crystalline phase of the synthesized Mn_xFe_3–xO₄/rGO nanocomposites formed an amorphous phase. The presence of rGO was observed through EDX results. The magnetical properties of Mn_xFe_3–xO₄/rGO nanocomposites were shown by decreasing the Br, H_cJ, H_max along with increasing of Mn doping. Interestingly, increasing rGO and Mn composition made the absorption bandwidth of the Mn_xFe_3–xO₄/rGO nanocomposites wider, so that the radar absorption also increased marking by the greater reflection loss that reached −11.95 dB. The increase in the radar absorption performance of Mn_xFe_3–xO₄/rGO nanocomposites came from the efficient complementarity between dielectric loss and magnetic loss and interfacial polarization between Fe₃O₄ doped Mn and rGO.

This research focuses on exploring the free vibration behavior of functionally graded (FG) nano-beams. To calculate the effective properties of the FG nano-beam, which varies solely in the thickness direction, the four homogenization schemes Mori-Tanaka, Tamura, Reuss and Voigt are employed. This study employs high-order shear deformation nano-beam theory and derives the governing equations of motion using nonlocal differential constitutive relations of Eringen. Hamilton's principle is utilized in conjunction with the refined three variables beam theory. The consideration of a length scale parameter accounts for small-scale effects. Analytical solutions are obtained for a simply supported FG nano-beam and compared with existing literature solutions. The research also investigates the influence of different homogenization schemes, the nonlocal parameter, beam aspect ratio and various material compositions on the dynamic response of the FG nano-beam.

Due to their environmentally benign elemental components, suitable bandgap and high absorption coefficient in the visible-light range, Cu-based multinary sulfides exhibit excellent photocatalytic properties. Moreover, the adjustable atomic structure and unique electronic state of Cu-based multinary sulfide semiconductors can boost their ability to absorb visible light. In this review, we provide a summary of recent progress in photocatalytic applications of Cu-based multinary sulfide nanomaterials, including Cu-based ternary sulfides (CuInS₂, CuIn₅S₈, Cu₃SnS₄, CuFeS₂, etc.) and Cu-based quaternary sulfides (CuZnInS, Cu₂ZnSnS₄, CuZnGaS, CuInGaS, etc.). We start with a review of the bandgap alignments of Cu-based ternary sulfides and Cu-based quaternary sulfides, which are the key factors for the photocatalytic activity of semiconductor photocatalysts. Then, we discuss the advancements in photocatalytic applications of Cu-based multinary sulfide photocatalysts, including photocatalytic H₂ production, CO₂ reduction, organic synthesis and degradation of pollutants and photoelectrochemical H₂ production. Finally, we end this review with a summary of the current challenges and opportunities of Cu-based multinary sulfides in future studies.

Carbon-based nanostructured materials are very promising for spintronic applications due to their weak spin-orbit coupling and potentially providing a long spin lifetime. Nanostructured carbons are not magnetic materials, but intrinsic magnetic behavioral nanostructure carbon materials could be fabricated through qualitative alterations. On alterations of carbon nanostructured materials, it changes their critical temperature and magneto-crystalline anisotropy energy that could be useful as favorable magnetic materials for different magnetic/electromagnetic device-based applications. Different processes are used for the alteration of nanostructure carbon materials like chemical doping, introducing defects, changing the density of states, functionalization, intercalation, forming heterostructure and fabricating nanocomposites layered semiconductor materials. Among the carbon-based derived nanostructured materials, the graphene oxide (GO) gets attracted towards the magnet forming in the spin-like structure across the area of the magnet. Due to its magnetic behaviour, it is used for the adsorption of metals and radionuclides and to make nonconductive oxide-metal. In this review article, the basics of magnetic behavioral change of the carbon-based GO/GO-nanocomposites nanostructured materials are described by gathering information from the literature that were/are reported by different researchers/research groups worldwide.