Sizes of particles and their uses

Question 1

What is nanoscience?

Answer 1

The study of small particles that are between 1- 100 nanometres

Question 2

What is 1 nanometre?

Answer 2

1nm = 1x10^-9m

Question 3

What is 1 micrometre?

Answer 3

1um = 1x10^-6m

Question 4

What are the particles in the air known as?

Answer 4

Known as particulate matter (PM) such as pollutants or pollen

Question 5

What are coarse particles commonly known as?

Answer 5

Dust or PM₁₀

Question 6

What are the diameters of coarse particles?

Answer 6

10 times bigger than particulate matter PM₁₀

Question 7

What are the diameters of fine particles?

Answer 7

Between 1um (100nm or 1x10^-7m and 2.5um

Question 8

As a cube decreases its side by a factor of 10, what happens to its surface area to volume ratio?

Answer 8

Its surface area to volume ratio increases by a factor of 10

Question 9

What is the surface area to volume ratio of nanoparticles?

Answer 9

It is high

Question 10

What do nanoparticles have different properties to?

Answer 10

The same materials in bulk

Question 11

Why are smaller quantities of materials needed when they are in nanoparticles?

Answer 11

To be as effective as normal sized particles

Question 12

What are some uses of nanoparticles?

Answer 12

Medicines, electronics, cosmetics, sun creams, deodorants and catalysts