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Each batch of nanoparticles is extensively characterized using techniques including SEM or TEM, XRD, COA, etc. In addition to ensuring that every batch of nanoparticles meets our stringent quality control requirements, customers are provided with batch-specific specification sheets containing representative SEM/TEM images, Coatings, dispersions, and solution pH. zero valent iron, Azo Powder , Activated Alumina , Gold Nanoparticles , Customized & ISO certified & Factory prices & Worldwide shipping.