Nanoparticles

What is the standard form in metres for a milimetre

1mm=1X10–3 metres

What is the standard form in metres of a micrometers

1um= 1X10-6 metres

What is the standard form in metres for a nanometre

1nm=1X10-9 metres

What is the diameter of Coarse particles(PM10 or dust)

Between 1X10-5m and 2.5X10-6

What is the diameter of fine particles(PM2.5)

Between 100nm-2500m(1X10-7 and 2.5X10-6)

What is the diameter of nanoparticles

Between 1 and 100 nanometres

What happens as a particle decreases by 10 times

The SA:V ratio increases by 10 times

Why does nanoparticles having a high SA:V ratio good

Nanoparticles may have properties different from those for the same materials in bulk because of their high surface area to volume ratio. It may also mean that smaller quantities are needed to be effective than for materials with normal particle sizes.

-For example you’ll often need less of a material that’s made up of nanoparticles to work as an effective catalyst compared to a material made up of normal particles

What are the uses of Nanoparticles

-Medicines

-electronics

-Cosmetics

-sun creams

-deodorant

-catalyst

What may be the risk of using Nanoparticles

1)It’s possible in sun creams,cosmetics and deodorants that nanoparticles can be absorbed into the body and enter our cells.

2)It’s also possible that when they are washed away, they might damage the environment

-However, no one know the potential long-term effects so it’s important nanoparticles are study