# Nanoparticles

Nanoparticles are structures, 1 to 100 nanometres (nm) in size, that usually contain only a few hundred . This means that nanoparticles are larger than atoms and simple .

## Comparing the size of nanoparticles

### Nanometres

The size of nanoparticles can be compared easily using the nanometre scale. For example:

• an 8 nm nanoparticle is larger than a 4 nm nanoparticle
• an 8 nm nanoparticle is larger than a single atom with a diameter of 1 nm

### Standard form

The size of nanoparticles and other atoms and molecules can be compared using standard form.

The sizes get smaller going down this table:

UnitDecimal Standard form
1 cm0.01 m1 × 10-2 m
1 mm0.001 m1 × 10-3 m
1 μm0.000,001 m1 × 10-6 m
1 nm0.000,000,001 m1 × 10-9 m
1 nm = 1 x 10-9 m = 0.000,000,001 m.
Question

List these numbers in order of size, starting with the smallest.

ABCD
5 × 10-95 × 10-85 × 10-107 × 10-9

5 × 10-10

5 × 10-9

7 × 10-9

5 × 10-8

Question

If one carbon atom has a diameter of about 1 nm, estimate the length of a nanoparticle that is 10 carbon atoms long. Give your answer in nm and in standard form.

1 nm x 10 = 10 nm

10 nm = 10 x 10-9 or 1 x 10-8 in standard form