Nanoparticles
A structure that is 1 - 100 nm in size are between 1 and 100 nanometres (nm) in size and are made up of a few hundred An atom is the simplest particle of an element that can exist on its own in a stable environment..
A nanoparticle has a very large The total area of all sides on a 3D shape. compared to its The volume of a three-dimensional shape is a measure of the amount of space or capacity it occupies..
The properties of Useful substances containing nanoparticles. substances are different from those of the same atoms in bulk such as powders, lumps or sheets.
One nanometre is 1 × 10-9m or 0.000000001 m.
Buckminsterfullerene, C60, is a nanoparticle.
Nanoparticles in sunscreen
Nanoparticulate materials are already common in sunscreens.
- they provide better skin coverage and more effective protection from the sun’s ultraviolet rays.
- nanoparticles may enter cells and cause damage.
- they may also be harmful to the environment.
- they could be more reactive or toxic than bulk material.
- these risks are difficult to determine because nanoparticles have not been in use for very long.