11) Nanoparticle

What is the size range for nanoparticles?

Nanoparticles range from 1 nm (1 x 10^-9 m) to 100 nm (1 x 10^-7 m) in diameter.

How many atoms do nanoparticles typically contain?

Nanoparticles typically contain only a few hundred atoms.

What are coarse particles and what is their size range?

Coarse particles (PM10) have a diameter between 2.5 x 10-5 m and 10,000 m (1 x 10-5 m).

What is nanoscience?

Nanoscience is the field of science that investigates the uses and properties of nanoparticles.

What is the formula for calculating surface area to volume ratio?

Surface area to volume ratio = surface area ÷ volume.

How does the size of particles affect their surface area to volume ratio?

As particles decrease in size, their surface area increases in relation to their volume, raising the surface area to volume ratio.

Calculate the surface area to volume ratio of a cube with sides of 100 nm.

The ratio is 0.06 nm^-1

Calculate the surface area to volume ratio of a cube with sides of 10 nm.

The ratio is 0.6 nm^-1

Why do nanoparticles have different properties compared to bulk materials?

Nanoparticles have a high surface area to volume ratio, which can lead to unique behaviors and enhanced effectiveness, such as requiring less material to function as a catalyst.

What are fine particles and what is their size range?

Fine particles (PM2.5) have a diameter between 100 nm (1 x 10^-7 m) and 2,500 m (2.5 x 10^-6 m).