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What is a nanoparticle?

A really small bit of stuff.

Not sure if the 'stuff' has to be anything in particular, nor if the 'really small' has a specified maximum dimension.

Cheers,
Greg

They're very small particles, normally with some kind of special intricate structure that's been built on a molecular/atomic level. They're normally good for catalysts or other materials that need a high surface area (like solar cells) or exploit special effects that only exhibit themselves at such small scales.

Check out the picture here:
http://en.wikipedia.org/wiki/Nanopartic ... Morphology

The "really small" is less than 100 nanometres.

That is what I thought but wasn`t 100% sure.

You crack me up Ryan...

I go away for a day and my job is being discussed on a brewing forum of all places.....

Ryan, look up 'grey goo' for another view on the whole nano malarky.

Wot tha?...mechanochemistry being used at cryogenic temps with scanning tunnelling microscopes !
I was completely unaware this particular system was in use until now.
Looks like I`ll have to spend a bit more time in the lab.