09 Nanoparticles

Nanoparticles are very small. Like all matter they are made of atoms but a tiny number of them - typically 100 to 1000. Nano particles are, therefore, obviously BIGGER THAN ATOMS. Being small, nanoparticles have a high surface area to volume ratio. Because chemical reactions take place on the surface of solids, this high surface area can change a substance's chemical properties - how it reacts