Cobalt oxide nanoparticles are nanoscale materials of cobalt oxides, typically CoO (cobalt(II) oxide) and Co³O4 (cobalt(II,III) oxide). These nanoparticles exhibit distinct physical and chemical properties compared to their bulk counterparts, making them valuable in various industrial, environmental, and technological applications. 2. Properties 2.1. Chemical and Physical Properties Chemical Formulas: Cobalt(II) oxide: CoO Cobalt(II,III) oxide: Co³O4...