1.4 Nanoparticles

Question 1

What is a nanoparticle?

Answer 1

A structure that is 1-100 nm (nanometres) in size and contains a few hundred atoms.

Nanoparticles exhibit unique physical and chemical properties due to their small size.

Question 2

Why do nanoparticles have different properties and uses than the bulk material?

Answer 2

High surface area to volume ratio.

This high ratio allows nanoparticles to interact differently with their environment compared to larger particles.

Question 3

State a use of nanoparticles.

Answer 3

Sun cream.

Nanoparticles are used in various applications due to their unique properties.

Question 4

Recall the benefits of nanoparticles in sun creams.

Answer 4

Better skin coverage, more effective protection from u.v. rays, invisible on the skin, do not degrade on exposure to the sun.

These benefits enhance the effectiveness and aesthetic appeal of sun creams.

Question 5

What are the potential risks of using nanoparticles?

Answer 5

Cell damage, harmful effects on the environment.

The small size of nanoparticles may lead to unforeseen interactions with biological systems and ecosystems.