... of 20~300nm at your requests. Usages nano sliver particles powder ( Ag )Appearance: Silver nanoparticles are black, no other ... nanoparticle layer form silver department has no anti-virus powder in machine to have the very strong and anti-virus ... includes elements such as B,Al,Si,Cr,Mn,Fe,Co,Cu,Mo,W,P,C,S. We offer ... with 1001000g in a metal box. nano sliver particles powder Cu Ag Bi Ni Fe Zn Sn