what is nanoparticles

The term nanoparticles covers a diverse range of chemical and other entities. They can be metallic, mineral, polymer-based or a combination of materials. They have multiple uses: as catalysts, drug delivery mechanisms, dyes, sunscreens, filters and much more.

here is no accepted international definition of a nanoparticle, but one given in the new PAS71 document developed in the UK is: "A particle having one or more dimensions of the order of 100nm or less". There is a note associated with this definition: "Novel properties that differentiate nanoparticle