Cobalt oxide nanopowder is a fine powder composed of particles of cobalt oxide smaller than 100 nm in diameter.  It serves as a vital inorganic material with a variety of applications. 

• Coatings: Enamels, grinding wheel surfaces, and other coatings utilize cobalt oxide in one of its various permutations. 
• Pigments: In glass manufacture, cobalt oxide nanopowders primarily act as pigments and colorants. Cobalt oxide also plays this role in porcelain and certain enamels.

"Cobalt (II) Oxide Nanopowder/Nanoparticles ( CoO, < 100nm)" -Retrieved 6/11/2021 from https://www.ssnano.com/inc/sdetail/cobalt__ii__oxide_nanopowder___nanoparticles___coo____100nm_/238

unable to locate sds online