THE Comparative Study of Nanostructured 3d and 4d Transition Metal Oxides (Mn₂O₃ and TiO₂) for Energy, Environmental, and Biomedical Applications: Synthesis, Characterization, and Future Perspectives: nanomaterials. IJC. 2026;65(2):118-127. doi:10.56042/ijc.v65i2.22095