As nouns the difference between nanoparticle and nanoshell

is that nanoparticle is any microscopic particle less than about 100 nanometers (nm) in diameter. In aerosol science, the term is often reserved for particles less than 50 nm in diameter; the term "ultrafine particles" is used for particles less than 100 nm in diameter while nanoshell is a dielectric nanoparticle coated with a very thin metallic shell.