Nanoparticles

• Nanoparticles

  1-100nm / "a few hundred atoms"Smaller than fine (PM2.5 = 100-2500nm) or coarse (PM10 = 2500-10 000nm) = dust
• -High SA:V ratio:Cut a cube into pieces half the

  length = double its SA
• • Smaller quantities may be needed to be effective for materials with normal particle sizes.
• Uses of Nanoparticles

  Uses: computers, catalysts, coatings, construction, cosmetics (sun cream and deodorant) and highly selective sensors