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5 OD PEI (Polyethyleneimine) silica-coated spherical gold nanoparticles are supplied in DI water, 500 nm gold core, 10 nm silica shell. https://www.cd-bioparticles.com/product/diagnano-pei-silica-coated-gold-nanoparticles-500-nm-silica-shell-10-nm-item-cgp-500-10-6812.html