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270 nm silica particles with Aminopropyl groups [(CH2)3 – NH2] covalently attached to the surface are supplied in ethanol or dry forms. The particles with terminal amine groups have a net positive charge if in solution. Size distributions: polydispersity index < 0.1. https://www.cd-bioparticles.com/product/diagnano-amine-silica-particles-270-nm-item-dng-h008-12902.html