1. Intrinsic Color: Black Bulk (micron-scale) pure Fe3O4(Magnetite) appears deep black under visible light. Reason: Fe3O4 is a narrow-bandgap semiconductor (bandgap ≈0.1≈0.1 eV), which absorbs light across the entire visible spectrum with virtually no reflection, resulting in a pure black appearance. Industrial products: Larger-particle Fe3O4powders (micron-scale...
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There are three main reasons for making copper nanowires into wet powder (soaked in solvents such as ethanol/isopropanol) for packaging: 1. Preventing oxidation - The main reason is that copper nanowires have a diameter of tens of nanometers, a very large aspect ratio, a very high specific surface area, and extremely strong surface activity. When exposed to air in a dry state, it rapidly oxidizes ...
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Scope: determination of Fe content/purity and impurity elements (Na, K, Ca, Mg, Al, Si, Mn, Cu, Pb, Cd, Cr, Ni, Zn, As, etc.) Instrumentation: ICP-OES (major Fe + common impurities, ppm level) / ICP-MS (trace impurities, ppb level) 1. Method Overview ICP-OES (Inductively Coupled Plasma – Optical Emission Spectrometry): major Fe content + common impurities (0.001%–100%), fast and cost-effective ICP...
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