Topic 4 - Nanoparticles Flashcards
1
Q
what is a nanoparticle?
A
A nanoparticle is a structure that is 1-100nm in size. It contains a few hundred atoms.
2
Q
Why do nanoparticles have very different properties compared to their bulk materials ?
A
This is due to their high surface area to volume ratio
3
Q
What happens when the sides of a cube have decreased by a factor of 10 ?
A
The surface area to volume ratio increases by 10
4
Q
Give 2 benefits of using zinc oxide nanoparticles in sun cream
A
They give better skin coverage
They don’t degrade on exposure to the sun
5
Q
Give 2 risks of using nanoparticles
A
Harmful effects on the environment
potential to damage cells in your body
