What are nanoparticles? Nanoparticles (NPs) are typically defined as granular materials with at least one dimension at the nanoscale (1-100 nm) in three-dimensional space. From the dimensions of structure and morphology, nanoparticles can be classified into zero dimensional nanomaterials (0D nanomaterials), corresponding to one-dimensional (1D) and two-dimensional (2D) nanomaterials. 0D nanopartic...
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Why modify the powder? Inorganic powders have hydrophilic and polar surfaces, but poor compatibility with organic matrices (plastics, rubber, resins). Direct use can lead to poor performance, so modification is necessary. (1) Improve dispersibility and prevent agglomeration. Inorganic powders with a large specific surface area are prone to agglomeration, which can lead to defects and a decrease in...
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The preparation of nanopowders is generally categorized into Physical Methods and Chemical Methods. Below is a detailed comparison list highlighting their characteristics: Comparison Table: Physical vs. Chemical Synthesis of Nanopowders Feature Physical Methods (Top-down) Chemical Methods (Bottom-up) Basic Principle Top-down: Bulk materials are broken down into nanoparticles using p...
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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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What Size Do XRD, SEM and TEM Actually Measure? X-ray diffraction (XRD) records how a crystal scatters X-rays, conventionally with the diffraction angle 2θ on the horizontal axis and diffracted intensity on the vertical axis. A periodic arrangement of atoms produces diffraction peaks, and the width of a peak is related to the distance over which that arrangement remains coherent. The coherent doma...
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