Particulate materials Silver nanoparticles synthesized free of stabilizing ligands.from Quantum plasmon resonances of individual metallic nanoparticles,Jonathan A.Scholl,Ai Leen Koh Jennifer A.Dionne,Nature 483,421-427(22 March 2012) 3 nm 5.nm Nb-O-F compound,specimen prepared by pulverization 9Particulate materials 9 Silver nanoparticles synthesized free of stabilizing ligands. from Quantum plasmon resonances of individual metallic nanoparticles, Jonathan A. Scholl, Ai Leen Koh & Jennifer A. Dionne, Nature 483, 421–427 (22 March 2012) Nb-O-F compound, specimen prepared by pulverization 3 nm