A nanoparticle(nm) is a billionth of a metre.
They have a very large surface area compared with their volume,so they often react quickly. This makes them usefull catalysts.
Uses of nanoparticles
Titanium dioxide is a solid that is used in house paints. Titanium dioxide nanoparticles do not reflect visible light, so they cannot be seen. They are used in sunblock creams because they block harmful ultraviolet light from the Sun without appearing white on the skin.
Some cosmetics contain 'liposomes', which are fatty nanoparticles. Liposomes also have great potential in the pharmaceutical industry, as they can deliver tiny doses of medicines direct to cells.
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