Iranian Journal of Materials Science and Engineering

• A low-temperature, catalyst-free gas phase method to develop a highly crystalline graphitic film
• First report on the function of dynamic nanoreactors for the creation of crystalline graphite out of them
• Introducing a new molecular fusion mechanism instead of atomic dissolution on metallic catalyst for graphene and graphite formation via nanoreactors

• The structural, electronic, optical, and mechanical properties of Ce_0.75Mo_0.25O₂ under hydrostatic pressures have been reported.
•  DFT with Hubbard parameter (U) was adopted to perform the modeled systems.
• The generalized gradient approximation (GGA) supported by the PBE functional has been utilized.
• Incorporating 25% of Mo element into the host CeO₂ lattice leads in dropping the bandgap to 2.045 eV.
• Applying pressures would further reduce the bandgap up to 1.808 eV at 100 GPa.
• Ce_0.75Mo_0.25O₂ under pressures exhibits thermodynamic stability.
• The investigated crystals show potential applications in optoelectronic devices.

1. A 3D orthogonal woven C/C-SiC- HfC composite was fabricated using I-CVI, SI, and LSI.
2. The composite showed superior ablation resistance compared to C/C and C/C-SiC.
3. HfC incorporation reduced ablation rates by forming a protective HfO2 layer.
4. Residual Si melted at high temperatures, creating a protective SiO2 layer.
5. The HfO2 layer blocked oxygen penetration and improved oxidation resistance.

Highlights

• Galvanostatic iron powder deposition was investigated using additive-free sulfate electrolytes at two Fe²⁺ concentrations.
• SEM, XRD, and EDX analyses revealed a strong current-density-driven transition from dendritic α-Fe to fragmented Fe/Fe₃O₄ morphologies.
• Powder yield increased linearly with current density, with empirical models showing excellent agreement with experiments (R² > 0.96).
• High current densities induced intense hydrogen evolution, reduced current efficiency, and promoted multiscale fragmentation of the deposits.
• The environmentally benign electrolyte system provides a robust platform for controlled, high-purity iron powder production relevant to advanced materials processing.

50.  rGO@Ag₂O composite were synthesized in order to examine their antibacterial activity.
50. The presence of diffraction peaks of rGO as well as Ag/Ag₂O in the XRD pattern of rGO@Ag₂O composite corroborated its successful preparation.
50. The composite revealed higher antibacterial activity against both of gram-negative and gram-positive bacteria, which was attributed to higher number of released Ag⁺ ions and reactive oxygen species by composite, compared to each of rGO and Ag₂O.